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Table of Contents
Are timing chains supposed to be loose?
Tensioners make sure the chain is tightly wound to the pulleys and gears. If the tensioner fails and the chain becomes loose, the timing of the engine is thrown off. And, if the timing chain becomes loose, you can get ready for serious and costly problems.
What happens when a timing chain gets loose?
Once a timing chain is stretched and has lost its integrity, the chain may skip a gear and lose the necessary coordination leading to an engine misfire. Repeated misfires could indicate a timing chain issue and should be investigated. There is a rattling sound.
Can you drive with a loose timing chain?
Can one drive a car with a bad timing chain? It is pretty bad to drive with a faulty timing chain, as it could cause serious damages to the vehicle’s engine. In worst cases, the car may stop suddenly on the highway, leaving you stranded and putting you at risk.
Can timing chain be tightened?
Rotate the eccentric to tighten or loosen the timing chain. The timing chain should be loose enough to prevent binding and tight enough to keep from falling off. The chain should move about 1/2″ for the front and 1/4″ for the rear without using force.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
In 2004 we switched from eccentrics with an adjusting screw to eccentrics with internal expansion. Specific instructions for the set screw style are listed below.
Loosen the eccentric with a 4mm allen key. There is an access hole on the right side of the eccentric. You will feel the screw loosen as you turn it out, after a few turns it will feel like it is tightening again, keep turning until the eccentric turns.
Turn the eccentric to tighten or loosen the timing chain. The timing chain should be loose enough to prevent binding and tight enough to prevent falling.
The chain should move about 1/2″ in front and 1/4″ in back without effort.
When you think the chain is set, tighten the eccentric and turn the cranks to see if there is a firm point.
If the chain is tight in one spot, readjust the eccentric and check again.
If you’re confused, this is a good time to visit your bike shop and watch them do it.
CAUTION: Be careful not to pinch your fingers between the chain and sprocket. It can cut off your finger.
Pre 2005 Set Screw Type Eccentric (Older Model)
Loosen the set screws under the bottom bracket shell. There are two of them, and 1 full turn should be enough.
The eccentric should be rotated so the spindle is over the centerline of the bottom bracket shell. (see drawing below) This is important as the set screws can damage the bearings if the bearings are directly over the set screws.
You can use either a pin wrench or a 36mm headphone wrench to turn the eccentric.
Adjust chain as described above.
When you think the eccentric is set, tighten the set screws (do not tighten them yet) and turn the cranks to see if there is a firm point. If necessary, readjust. Tighten the setscrew to 60 to 70 in-lbs (7 to 8 Nm).
How much slack should a timing chain have?
Probably about 1/2 inch is MAX. As long as it doesn’t slip, you won’t have a problem. IMO any slack is to much. It will allow some cam timing variation.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Two types of play…on the chain…and stretching.
Rotate the crank one direction to take up the “distance” and then rotate the other direction…and note how many degrees of crank rotation there are before the chain tightens again. Where is the cutoof pont? There is no concrete answer. You have to judge. Chain stretch makes it impossible to properly time the engine as the timing mark “floats” everywhere. If it’s too much (again, not a hard number), then the chain is about to skip time or break.
Can loose timing chain cause loss of power?
Since the timing chain times the opening and closing of engine valves, any damage can unbalance the air-fuel ratio and result in a lack of power.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
What is a timing chain?
A metal-link timing chain runs along a set of gears to turn the crankshaft and camshaft, and regulates the opening and closing of the engine valves in coordination with the ignition pistons. Since the timing chain is housed in the engine, it is lubricated by the engine oil, which is essential for smooth operation. Despite the metallic composition, timing chains can wear out, become loose or break under stress.
Signs of a faulty timing chain
A worn timing chain has some symptoms that indicate the timing chain is not working properly. These signs include:
Rattling noise when starting the engine or when idling
A common finding in a vehicle with a bad timing chain is an unusual rattling noise when the engine is started or the brakes are applied. This happens due to the loose or stretched timing chain, which shakes when turning and rattles when the engine is running.
Engine misfire
Since the timing chain controls the opening and closing of the engine valves, any damage can throw the air/fuel ratio out of balance and lead to poor performance. It shows up as jerky movement and loss of acceleration.
Contaminated engine oil
Another warning sign is metal parts in the engine oil. Metal parts of a damaged timing chain can break off and get into the oil. This finding must prompt the owner or mechanic to inspect the timing chain.
Check the engine light
Just like any other malfunctioning component of the engine, a faulty timing chain will illuminate the check engine light. It’s a warning to have your vehicle checked for underlying engine problems, which may include a bad timing chain.
inability to start the engine
This is a sign of the ultimate break in the timing chain. The vehicle will not start and may also damage other engine components.
If these signs are recognized in good time, the impending failure of the timing chain can be prevented with a professional repair service. If you suspect your vehicle’s timing chain needs repair, call our auto repair shop today!
How does a car act when the timing chain is going out?
Engine won’t start or fails
A broken timing chain will cause an engine to not start or fail while driving. If the belt is already broken, the engine won’t have enough compression to start. If it breaks or jumps while driving, the pistons will be damaged from contact with the valves.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
The timing chain is a series of links in the chain – similar to a bicycle chain. The links move on the sprockets, which are located at the ends of the crankshaft and camshaft and are responsible for opening and closing valves in the cylinder head and for moving the pistons and connecting rods in the combustion chamber. The timing chain can stretch and wear over time, causing engine timing to be inaccurate and producing some warning signals.
Below are 5 of the symptoms of a worn timing chain. If you notice any of these warning signs, you should contact a local mechanic as soon as possible to diagnose the exact cause and make the appropriate repairs, if necessary.
1. Engine will not fire or runs poorly
There are two ways to achieve valve timing in an internal combustion engine. The first is the two-speed method, in which the crankshaft is directly connected to the camshaft sprocket. This is the method used on most types of heavy equipment and large trucks. The timing chain method is more common on consumer vehicles and high-performance engines. Over time, the timing chain can stretch, which can cause the chain to skip a gear on the camshaft or crankshaft. This causes the engine timing to fall out of calibration and often leads to misfires. The engine can also run poorly and have no acceleration power.
When this situation occurs, the timing chain is likely damaged and needs to be replaced as soon as possible. If the timing chain breaks, loose metal rolling around inside the engine can cause serious engine damage.
2. Metal filings found in the oil
It is recommended by all car manufacturers to change the engine oil and filter every 3,000 to 5,000 miles. Over time, oil begins to separate when heated and exposed to natural solvents found in gasoline. As the timing chain begins to wear, small pieces of metal can break off the chain and end up in the oil pan. If you have your oil changed and the mechanic tells you that there were small pieces of metal in the oil when it was drained or in the filter, that is a good indication that your timing chain is starting to fail.
Metal shavings are also commonly seen when cylinder head valves, retainers, brackets and other cylinder head parts are severely worn. It is important to have a mechanic or technician investigate this problem and make the appropriate repairs as soon as possible.
3. Engine will not start or stalls
A broken timing chain will result in an engine not starting or failing while driving. If the belt is already broken, the engine will not have enough compression to start. If it breaks or cracks while driving, the pistons will be damaged from contact with the valves. The valves themselves will bend, possibly ruining the engine. If the belt jumps because it’s loose, it can also whip around and damage other parts of the engine. If your engine won’t start or runs rough, indicating it’s on the verge of failure, take it to a certified mechanic for inspection and repair.
4. Check engine light is on
The check engine light can come on for a number of reasons, one of which could be a bad timing chain. A car’s computer will display warning lights that need to be checked and scanned for trouble codes to determine the source of the problem. The check engine light may come on when the onboard computer detects a fault in the exhaust system and engine operation. A stretched timing chain contributes to poor engine performance and increased emissions, triggering the check engine light and storing a diagnostic trouble code. A mechanic must review the code and prescribe the necessary repairs.
5. Engine rattles at idle
Unusual noises are also a common warning sign of a problem in your engine. Under normal conditions, the engine should have a steady, steady sound that indicates everything is running as it should. However, if the timing chain is loose, it can cause vibrations in the engine, which will produce a rattling noise when the engine is idling. Anytime you hear a rattle, it means something is loose and needs fixing before it breaks.
The timing chain is an essential part of any engine and without it your vehicle is useless. If the timing chain breaks while driving, serious engine damage to your vehicle is likely. The best way to reduce the risk of serious engine damage is to have the timing chain replaced by a professional mechanic if you notice any of the warning signs listed above. By being proactive and vigilant, you can save thousands of dollars and significantly extend the life of your engine.
How much does it cost to fix a timing chain?
Timing chain replacement can cost between $600 and $800 for a DIY repair, or between $1,600 and $1,800 with a mechanic. The cost is high due to the complicated nature of replacing this part. If you want to DIY a timing chain replacement, the parts will cost around $650.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Replacing the timing chain can cost anywhere from $600-$800 for a DIY repair, or $1,600-$1,800 at a mechanic’s. The cost is high due to the complicated nature of replacing this part.
If you want to make a timing chain replacement yourself, the parts cost about $650. However, this is a task best left to those with ample experience working on cars.
Luckily, unlike rubber timing belts, timing chains are designed to last the life of the car, so you’re unlikely to need to change them. If you suspect a faulty timing chain, look out for the following symptoms:
Timing chain is noisy
Starting the vehicle is difficult
The engine vibrates or shakes at idle
The engine does not fire or operates poorly
Check engine light comes on
If any of these symptoms persist, take your car to a mechanic as soon as possible. Resolving the problem promptly will prevent further damage to your vehicle.
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How long will a stretched timing chain last?
When does a timing chain need to be replaced? The timing chain normally needs to be replaced between 80,000 and 120,000 miles unless there is a specific problem.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
A timing chain synchronizes the rotation of the crankshaft and camshaft(s), provides proper timing, and allows the engine valves to open and close during each cylinder’s firing. The chain is inside the engine and needs to be lubricated by the oil in the engine, so oil maintenance is also important. Every time you use the engine, the timing chain is in action.
When does a timing chain need to be changed?
The timing chain usually needs to be replaced between 80,000 and 120,000 miles unless there is a specific problem. Chain problems are common on higher mileage vehicles. If you are driving an older vehicle or one with almost 100,000 miles on it, it is recommended to look for signs of the timing chain going bad or failing.
Because the timing chain can fail and need to be replaced, it’s important to recognize the symptoms and have it repaired before it fails completely.
Signs that a timing chain needs to be replaced include:
Later model VVT applications will generate engine codes and check engine lights before the engine rattles
Older pre-VVT applications produce engine rattle
What causes timing chain noise?
Timing chain noise is generally most noticeable during cold vehicle starts, when oil pressure and flow are at their lowest. Excessive slack in the timing chain can cause a rattling noise or even a clanking noise if the slack is so severe that the chain is touching the timing chain cover. If the engine is equipped with a hydraulic timing chain tensioner, the noise may disappear or lessen as the engine oil warms up and the tensioner takes some of the slack out. If the timing chain wear is so great that the tensioner can no longer take up the slack, the noise may persist even after warming up.
What signals a timing chain damage?
In many cases, timing chains stretch due to improper maintenance by the owner. Waiting too long between oil changes and using the wrong type or viscosity of engine oil will wear out the pins and plates of the timing chain, causing the timing chain to stretch. Wear of the timing chain pins and plates is accelerated by impurities in the oil, which is why frequent oil changes are necessary. It’s not that the old oil doesn’t lubricate, particles getting trapped in the oil and acting between the pins/plates lead to accelerated wear. In addition to carelessness when changing the oil and using the oil improperly, using the wrong or substandard oil filter can also lead to accelerated wear of the timing chain.
Should I also replace sprockets?
Yes, Cloyes recommends replacing all timing system components at the same time. Using a worn sprocket can result in the chain no longer meshing with the worn sprocket, which can result in poor engine performance. Cloyes offers a wide range of complete timing chain kits for most vehicles on the road today.
What causes a timing chain to snap or wear out?
Over time, the timing chain stretches due to internal wear of the components. The chain tensioner or the guides connected to the timing chain can also wear out and lead to the total failure of the timing chain. If the chain breaks, the vehicle will not run at all.
How important is oil quality?
Using the wrong oil is a common symptom that causes a vehicle’s timing chain to wear out even faster. Modern vehicles can often only use synthetic oil as they have to meet certain specifications to ensure the oil flows quickly and at the right pressure. The wrong oil can put additional strain on the chain and the engine will not be properly lubricated.
Each vehicle manufacturer specifies an API minimum maintenance rate, a recommended viscosity, and often a specific oil. Improper oil viscosity can also have serious effects on the operation of the timing chain tensioner, solenoids and variable valve timing actuators, and wear on the direct injection fuel pump. In fact, using an engine oil viscosity other than the factory recommended one can result in a check engine light and engine damage.
Should I replace the accessory drive belt when replacing a timing chain?
The timing chain resides within the engine, requiring multiple steps to get to the timing drive, making inspection and replacement of timing chains and timing drive components difficult. When replacing the timing chain it is important that the secondary belt, tensioner, idler pulleys and water pump are checked as these components wear at a similar rate. These components are inexpensive compared to labor costs.
How do you diagnose a stretched timing chain?
Read the amount of stretch on the timing tab. For example, if the rotor tip began to move at 10° after TDC as measured at the timing mark, the chain has 10° of stretch. Any reading more than 4° to 5° is considered excessive and you need to schedule time to install a new timing chain and gear set.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Because the camshaft and timing of valve events are controlled by the rotation of the crankshaft and are often linked by a chain, any wear affects not only valve action but also the timing of ignition by the distributor.
The stacking created by stretch in the timing chain can represent many different types. The first sign is a decrease in engine power. As the chain gets longer, there’s a chance it’s actually wearing through the timing case cover. If the chain tension is skewed enough, it can skip a few teeth at the timing gear and, at best, the engine will stall. However, the piston can collide with the valves, potentially damaging the block and cylinder head. In some cases, the chain will knock when extremely stretched – but don’t rely on this warning.
As the timing chain wears, the position of the camshaft lags in relation to the centerline of the intake cam. The distributor is driven via the gear on the camshaft, so it changes the position of the distributor shaft and primary trigger (breakpoints or reluctor ring in the case of electronic ignition) and also retards ignition timing.
A first sign of a slack timing chain is a change in ignition timing with the distributor housing in the same position. For example, if you set the timing at 10° before top dead center (BTDC) and the distributor hold down is tight and the timing is now at 6° TDC for a period of time, the most likely cause is slack in the timing chain.
You can then simply reset the ignition timing to the correct spec, but you have to keep in mind that the chain will wear out.
Over the years I have seen many engines scrapped due to a worn timing chain. Some had a rhythmic knocking noise that was misdiagnosed as a connecting rod bearing, or a lack of power that was interpreted as a worn engine. For this reason, you should never jump to conclusions when diagnosing any device – especially an engine.
To accurately determine wear in a timing chain, first remove all of the spark plugs and the distributor cap. Using a wrench on the harmonic balancer screw, rotate the crankshaft backwards at least two full turns to remove any slack in the timing chain.
While still rotating the crankshaft in the opposite direction to its current rotation, bring the timing mark on the harmonic balancer to top dead center (TDC) on the timing tab or pointer. With an assistant watching the distributor rotor, carefully rotate the crankshaft in the correct direction of rotation.
As soon as the rotor tip starts to move, STOP! Read the stretch on the Timing tab.
For example, if the rotor tip started to move at 10° after TDC, measured from the timing mark, the chain has an elongation of 10°. Any reading greater than 4° to 5° is considered too high and you will need to allow time to install a new timing chain and gear set.
That being said, many early General Motor light duty diesel engines used in pickup trucks foolishly used a timing chain instead of gear train to drive the camshaft and injection pump since the engines were based on the petrol versions. Excessive stretching often occurred over time due to the rotational stress on the chain. The timing of the diesel injection pump is not as forgiving as a gasoline engine’s distributor. The result was a poorly running engine, but few knew it was caused by a worn timing chain.
What is slack in timing chain?
When a timing chain starts to fail due to slack, normally caused by the belt tensioners weakening, it rattles and chatters. You will be able to hear a clicking, chattering noise coming from the area around your cam shaft if your timing chain has slack in it.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Jupiterimages/Creatas/Getty Images
Timing chains are used in some vehicles instead of timing belts. Unlike timing belts, replacing a timing chain is uncommon. Common chain problems include the loss of some or most of the tension that stays in place and maintains proper operation. There are several symptoms that can occur when your car or truck has a loose timing chain.
How do you know if your timing chain is stretched?
Read the amount of stretch on the timing tab. For example, if the rotor tip began to move at 10° after TDC as measured at the timing mark, the chain has 10° of stretch. Any reading more than 4° to 5° is considered excessive and you need to schedule time to install a new timing chain and gear set.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Because the camshaft and timing of valve events are controlled by the rotation of the crankshaft and are often linked by a chain, any wear affects not only valve action but also the timing of ignition by the distributor.
The stacking created by stretch in the timing chain can represent many different types. The first sign is a decrease in engine power. As the chain gets longer, there’s a chance it’s actually wearing through the timing case cover. If the chain tension is skewed enough, it can skip a few teeth at the timing gear and, at best, the engine will stall. However, the piston can collide with the valves, potentially damaging the block and cylinder head. In some cases, the chain will knock when extremely stretched – but don’t rely on this warning.
As the timing chain wears, the position of the camshaft lags in relation to the centerline of the intake cam. The distributor is driven via the gear on the camshaft, so it changes the position of the distributor shaft and primary trigger (breakpoints or reluctor ring in the case of electronic ignition) and also retards ignition timing.
A first sign of a slack timing chain is a change in ignition timing with the distributor housing in the same position. For example, if you set the timing at 10° before top dead center (BTDC) and the distributor hold down is tight and the timing is now at 6° TDC for a period of time, the most likely cause is slack in the timing chain.
You can then simply reset the ignition timing to the correct spec, but you have to keep in mind that the chain will wear out.
Over the years I have seen many engines scrapped due to a worn timing chain. Some had a rhythmic knocking noise that was misdiagnosed as a connecting rod bearing, or a lack of power that was interpreted as a worn engine. For this reason, you should never jump to conclusions when diagnosing any device – especially an engine.
To accurately determine wear in a timing chain, first remove all of the spark plugs and the distributor cap. Using a wrench on the harmonic balancer screw, rotate the crankshaft backwards at least two full turns to remove any slack in the timing chain.
While still rotating the crankshaft in the opposite direction to its current rotation, bring the timing mark on the harmonic balancer to top dead center (TDC) on the timing tab or pointer. With an assistant watching the distributor rotor, carefully rotate the crankshaft in the correct direction of rotation.
As soon as the rotor tip starts to move, STOP! Read the stretch on the Timing tab.
For example, if the rotor tip started to move at 10° after TDC, measured from the timing mark, the chain has an elongation of 10°. Any reading greater than 4° to 5° is considered too high and you will need to allow time to install a new timing chain and gear set.
That being said, many early General Motor light duty diesel engines used in pickup trucks foolishly used a timing chain instead of gear train to drive the camshaft and injection pump since the engines were based on the petrol versions. Excessive stretching often occurred over time due to the rotational stress on the chain. The timing of the diesel injection pump is not as forgiving as a gasoline engine’s distributor. The result was a poorly running engine, but few knew it was caused by a worn timing chain.
How do I know if my timing belt is too loose?
- Engine runs rough or misfires. A worn-out belt will affect the engine’s timing, and possibly cause it to misfire. …
- Ticking or clicking noises in the engine. When the timing belt wears out, it can cause a ticking or clicking sound inside the engine. …
- Squealing sounds. …
- Engine won’t start.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Newer cars can typically go 100,000 miles before the timing belt needs replacing. Older vehicles may need to be replaced at 60,000. It is important to consult your owner’s manual to find your vehicle manufacturer’s recommendation. On some engines, the water pump is driven by the timing belt rather than the serpentine belt. If that’s the case then it’s a good idea to replace the water pump along with the timing belt change and vice versa as there is much of the same work to be done for both. The same applies to the toothed belt tensioner – it should be checked and possibly replaced.
How can you tell if a timing belt is about to fail?
The toothed belt is sealed in its own housing, which makes it extremely difficult to check it yourself. There is also no clear indication that a timing belt is going bad. When a timing belt fails, it usually happens very suddenly. As soon as an error occurs, the engine stops immediately or loses significant power. If your vehicle has a chain instead, it can make a lot of noise if it’s loose. If this chain breaks, you can often hear the cracking. While it’s difficult to perform a visual or physical inspection, there are some signs that you can use to indicate timing belt problems.
1. Engine runs rough or does not fire
A worn belt will affect engine timing and potentially cause misfire. If the belt is worn or loose, it will slip and cause the cylinders to open and close earlier than they should. If this timing is off, the engine will run erratically if it runs at all. Engine misfires are an indication of problems that should be checked as soon as possible to avoid serious engine damage.
2. Ticking or clicking noises in the engine
When the timing belt is worn, it can cause a ticking or clicking noise in the engine. This noise can indicate low oil pressure, which can affect the timing belt. The tensioner, which keeps the belt taut, is pressurized by the engine oil. If the tensioner does not have oil pressure, the belt will loosen and possibly come off the pulleys and/or snap. If the camshafts don’t have enough oil pressure to work properly, they will also lock up, causing the timing belt to snap.
3. Squeaking noises
Squeaks or squeaks can occur at different times, e.g. B. when accelerating, decelerating and braking or simply idling. There are a few possible causes of such noises coming from your car, and all of them can mean a repair – but if it’s a worn timing belt that’s about to snap, it’s best to get it checked out right away.
4. Engine will not start
If the timing belt breaks completely, the car will not start. The starter turns on, but the car does not turn. It won’t even annoy you – there won’t be an answer.
Timing belts should be left to experienced mechanics who have experience working with them. An experienced mechanic will know the telltale signs of wear as well as other potential problems that could affect timing belt condition, operation, and other engine systems and functions. State Street Auto Repair is here to help if you are having trouble and need your timing belt checked or replaced, as well as any repairs that may be needed due to damage caused by a broken timing belt.
Related Articles
Why is my timing belt loose?
Causes Of Timing Belt Tensioner Failure
Over time, the spring stretches out and loses its tension. As a result, the entire tensioner becomes too weak. Dirt and dust build-up on the timing belt tensioner pulley: When this happens, the pulley will fail to support the timing belt. It may cause the timing belt to slip off.
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
So if there is a suspicion that the timing belt tensioner has failed, it is important to check the tensioner and replace it if necessary.
Causes of timing belt tensioner failure
The most common causes of timing belt tensioner failure are:
Wear: With a new mechanical toothed belt tensioning system, the toothed belt tensioning spring is tightly wound by two pull rods. Over time, the spring expands and loses its tension. This makes the entire tensioner too weak.
With a new mechanical toothed belt tensioning system, the toothed belt tensioning spring is tightly wound by two pull rods. Over time, the spring expands and loses its tension. This makes the entire tensioner too weak. Dirt and dust deposits on the toothed belt tensioning pulley: In this case, the belt pulley can no longer carry the toothed belt. It can cause the timing belt to slip off.
In this case, the pulley can no longer support the toothed belt. It can cause the timing belt to slip off. Hydraulic Oil Leak: A hydraulic timing belt tensioner works like a small shock absorber. It uses hydraulic oil to maintain tension. If the timing belt tensioner is leaking, it loses the tension it needs to keep the timing belt taut.
Signs of a failure of the timing belt tensioner
There are several ways to detect timing belt tensioner failure simply by driving the vehicle. One thing to note is that the timing belt, which has teeth, doesn’t actually slip when the tensioner starts to fail. Instead, the tensioner cannot maintain the proper tension on the timing belt when the throttle is opened abruptly. The crankshaft and camshaft will come out of perfect timing for a moment or two.
Look for the following signs of timing belt tensioner failure:
acceleration problems
Lack of perfect timing leads to acceleration problems. You may notice sluggish acceleration.
Problems starting the vehicle
If there are problems with the timing belt tensioner, then the valve timing is slightly shifted. This leads to starting difficulties. It may take a while for the engine to start properly. Even if you manage to start the engine, you have to expect that the engine will fail or run rough.
Strange noises
If the timing belt is not tight enough, it will make noise. Or you may hear noises from the timing belt tensioner. For example, the pulley cannot rotate freely. It may start squeaking as it spins. When the engine is idling, listen for the following noises in the timing case cover area:
rattling noises
Squeaking or squeaking noises
knocking noises
Remember that the serpentine belt also has a tensioner and sometimes an idler pulley as well. Both can also make the same noises as a timing belt tensioner. They are both relatively easy to inspect and simple and inexpensive to replace. So if you are in doubt as to where the noise is coming from, first take steps to rule it out. Even if they fail, they generally don’t cause stumbling or starting difficulties. If they are okay, continue digging deeper to troubleshoot the timing belt tensioner.
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Timing Chain too loose or no?
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Timing chain loose on one side | Mercedes-Benz Forum
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Timing chain slack …is this normal ? – YotaTech Forums
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timing chain slack on one side – Ford Truck Enthusiasts Forums
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Date Published: 10/18/2022
View: 3197
Signs That You Have a Problem with Your Timing Chain
Over the years, Audi has used both timing belts and chains. If you have a 2005 and later Audi, you most likely have a timing chain. It’s important to understand a little about the difference between a timing belt and a timing chain in an Audi. But more importantly, you know the symptoms of a faulty timing chain and what to do if any of these symptoms appear. A bad timing chain can be disastrous for your engine and result in a very costly engine repair. If you think your Audi’s timing chain is in trouble, contact us at Triangle Imports immediately. A damaged engine in an expensive car will be an expensive repair. So read on to learn more about timing chains and understand the symptoms to look out for when your Audi’s timing chain needs replacing.
Toothed belt vs. timing chain
In order for a combustion engine to function properly, it must have precise, mechanical engine control. More precisely, the crankshafts and the camshafts must rotate together. In 2005, Audi began the gradual conversion from the toothed belt to the timing chain. While chains are heavier and a bit noisier than belts, they are more durable. One of the main reasons chains have replaced belts in large displacement engines is their durability.
Most techs suggest you replace your timing belt every 75,000 miles or five years; However, timing chains have the potential to last the life of a vehicle. To find out if your Audi model and year uses a belt or chain, contact a Triangle Imports certified Audi technician. If your Audi has a timing belt, also read our blog on replacing timing belts on Audi for more information.
A loose timing chain means big problems
The timing chain maintenance schedules for an Audi say you can drive 120,000 miles without a problem. However, service technicians see Audi timing chains fail much sooner. In order for a combustion engine to function properly, it must have precise, mechanical engine control. More precisely, the crankshafts and the camshafts must rotate together. Timing chains are the crucial link between crankshaft and camshaft.
Tensioners ensure that the chain is tightly wound on the pulleys and sprockets. If the tensioner fails and the chain becomes loose, the timing of the engine will shift. And when the timing chain becomes loose, you can be in for serious and costly problems. If the timing chain breaks or jumps while driving the car, the pistons will be damaged from contact with the valves, the valves will bend and potentially ruin the engine.
Symptoms of a loose timing chain
If a loose timing chain is not fixed immediately, it can snap and cause catastrophic engine damage, so be aware of the symptoms.
Engine misfires and problems starting the engine
If a timing chain is loose or stretched, it can cause misfire while driving because the timing between valves and pistons are not in sync, affecting combustion in the engine. A stretched chain can skip a sprocket on the camshaft or crankshaft, leaving the engine’s timing out of calibration. This causes the misfire. A loose timing chain can also cause you to have trouble starting the engine as it affects the engine’s combustion.
Engine rattles when starting or idling
A normal engine has a smooth and consistent sound, which means everything is going well. If you hear a rattle or an unusual noise, it means there is a problem with the engine. If the timing chain is loose, it can cause the engine to vibrate, resulting in a rattling noise when idling or when the engine starts. If you hear a rattle, it means something is loose and needs to be fixed before it breaks.
metal filings in the oil
When your timing chain wears out, small pieces of metal can break off the chain and end up in the oil pan. If you have your oil changed and the mechanic points out small pieces of metal in the oil when you drain it or in the filter, it could mean that your timing chain is starting to fail. However, be aware that there are other issues that can cause metal shavings to be in the oil. If you find that there is metal in the oil, contact our technicians at Triangle Imports as soon as possible for an inspection, accurate diagnosis, and reasonable repair.
Call our Audi repair technicians immediately
If your Audi is exhibiting any of these symptoms, call Triangle Imports immediately before you have catastrophic engine failure. We are experienced in diagnosing and repairing serious problems like timing chain failures. To schedule your appointment, call us at (919) 439-1591 or fill out our online contact form.
What are the Symptoms of a Bad Timing Chain?
What is a timing chain?
A timing chain, or in some engines a timing belt, is responsible for coordinating the opening and closing of valves within the internal combustion engine. This coordination is achieved by synchronizing the camshaft and crankshaft to open and close the valves while preventing the pistons from hitting those valves.
The timing chain consists of several links that run smoothly over gears, but with such a dynamic role in the engine, the timing chain is prone to wear and can cause problems. Luckily, there are a few telltale symptoms to watch out for.
What are the symptoms of a bad timing chain?
The engine does not fire. Once a timing chain has stretched and lost its integrity, the chain can skip a gear and lose necessary coordination, causing the engine to misfire. Repeated misfires could indicate a timing chain problem and should be investigated.
There is a rattling noise. A loose timing chain, or worse, a broken timing chain with loose parts in the engine will make a rattling noise when your car is idling. This rattling noise is usually most noticeable as the engine warms up and will go away after a while. Noise aside, loose parts in the combustion system can cause significant damage to the engine, so any rattling noise is a concern and is best investigated.
Check your car’s oil for metal filings. When a timing chain wears out, it breaks down and some of the metal shavings can end up in your car’s oil pan. When the oil and oil filter are changed, these small pieces of metal are observed and indicate a problem with your car’s engine. A mechanic should investigate the source of the metal shavings as it may well be the timing chain.
What do I do if I suspect a timing chain problem?
If you suspect your car’s timing chain needs replacing, it’s best to investigate immediately. A broken timing chain is annoying and can cause further costs if your engine is damaged as a result. If you need a timing chain repair, call our auto repair shop today!
Symptoms of a Bad Timing Chain and Replacement Cost – Rx Mechanic
Most people tend to overlook a few auto components, and one of those parts is the timing chain. A defective timing chain can seriously damage the engine and reduce its performance. However, you would notice some symptoms of a bad timing chain before a complete failure.
Most experienced drivers know that their car’s internal combustion engine uses either a timing chain or a belt. However, the timing chain is often present in large displacement engines because they are attached to a set of pulleys and gears.
The timing chain must move the camshaft and crankshaft smoothly before the engine fires. So the engine will not start if the timing chain is worn or broken. You may wonder why the chain breaks if it is made of metal and seems strong.
Well, metal-to-metal contact and other external factors can cause the timing chain to wear out over time. Don’t worry, the system will emit some signs to alert you to the ongoing danger so you can replace the worn chain in time.
What is a time chain in a car?
The mechanical functionality of the engine depends on the timing chain and it works well to make the engine efficient. The main task of the timing chain is to ensure that the movement of the crankshaft matches that of the camshaft.
Put simply, this vehicle component ensures that the engine valves open and close at the right time when the cylinder fires. The chain comes with various links that hook onto the camshaft and crankshaft sprockets.
Basically, it moves around its connected gears according to the timing that matches when the engine fires. No doubt the contact with the other metals creates some level of friction, but the oil from the engine helps lubricate the timing chain.
Therefore, regular oil changes are necessary to ensure that the timing chain moves smoothly when driving your car. You may be wondering how the timing chain and associated gears work; Here’s a look at what’s happening inside the engine.
The pistons drive the crankshaft and a sprocket on the shaft moves the timing chain. Then the motion of the timing chain continues to drive the camshaft, which plays a significant role in operating the valves.
So if the timing chain is correct, the intake and exhaust valves will move in tandem with the movement of the piston. Such synchronized movement is what most car experts refer to as “correct valve timing.”
The engine design also has the timing chain that drives the balance shafts, fuel pump, oil pump and other engine components. In most engines you will find the timing chain tensioner to provide adequate tension for the chain to move
Please note that there are two main types of timing chains that you can find in vehicles today. The first is the link chains, which are constructed with various precision links (made of alloy flat steel) connected by pressed pins.
But the second type of chain is the roller chain, which is similar to those found on bicycles but appears larger. Regardless of the type of chain, you will find them closed and in front of your car’s engine.
Can you drive a car with a defective timing chain?
It’s pretty bad to drive with a broken timing chain as it can cause serious damage to the vehicle’s engine. In the worst case, the car can suddenly stop on the freeway, abandoning you and endangering you.
What is the timing chain on bicycles?
Timing chains are not only found in car engines, but also in motorcycles. The small roller chain that looks like the regular bike chain appears to be the timing chain for your bike’s engine. This chain drives the camshaft that sits on top of the engine; hence it is called the “cam” chain.
Still, some bikes don’t have a timing chain, instead using belts and gears to drive the camshaft. Like the car engine, the motorcycle engine also has valves that ensure gas exchange in the cylinder.
These valves can only be opened or closed with the help of the crankshaft. Your motorcycle’s timing chain is connected to the crankshaft and camshaft. The basic appearance has the timing chain connected to the sprockets.
Please note that the larger sprockets mount on the camshaft while the smaller sprockets mount on the crankshaft. As in a car, the crankshaft motion drives the chain of the bicycle motor.
Then the timing chain sets the camshaft in motion, causing the valves to open and close. There is also a timing chain tensioner with a slider or wheel that provides enough pressure for proper chain movement.
Essentially, the tensioner supports the chain and eliminates any excess slack. Therefore, you should look out for symptoms of a bad timing chain tensioner on motorcycles when the timing chain system is not working properly.
Signs of a bad timing chain
Unlike timing belts, engine timing chains seem to last longer. Still, it’s common for things to wear out with constant use. The accumulated wear of over 150,000 miles of drives can cause serious damage to the timing chain.
Some experts reveal that car owners should schedule a 120,000-mile service to avoid a faulty timing chain. However, this speculation varies from car to car and the amount of wear and tear would depend on car usage.
Still, a loose or broken timing chain is a big problem as it can cause some damage to the piston and valve. Undoubtedly, such damage can also cause the engine to fail, causing new car engine costs.
Therefore, try to be on the lookout for possible signs that the timing chain is in poor condition. Ignoring the obvious symptoms of a bad timing chain can be disastrous. With that in mind, below are some symptoms of a bad timing chain.
The timing chain comes loose from the tensioner or its idler pulley
The timing chain tensioner supplies the chain with sufficient pressure for proper running. Thus, the car’s engine would stall when the chain comes loose from the tensioner. You would begin to hear an audible grinding or rattling noise before the engine completely stops.
This sign seems to be common and can alert you when the chain jumps off a single sprocket. It is imperative to take such symptoms seriously and take the vehicle to an experienced mechanic.
Check the engine light
The CEL warning on your vehicle’s dashboard is a common occurrence when there is an engine problem. As mentioned above, a bad timing chain would cause serious problems for the engine. Either the exhaust emissions exceed speculation, or the system exceeds preset valve timing limits.
By now you should know that the opening and closing of the valve is controlled by the timing chain and tensioner. So if the check engine light comes on, it could be a sign that the engine chain is worn.
This sign is also one of the symptoms of a bad timing chain tensioner. In most cases, the tensioner and chain wear out at the same time; Therefore, you should replace both if necessary.
Still, there are a plethora of issues that can cause the check engine light to come on. Therefore, you may want to run another diagnosis with the OBD2 scanner. This diagnostic tool would display a code telling you whether the timing chain is in bad shape or not.
Rattling noise
Various strange noises seem to be quite audible when the timing chain is bad. You would often hear such strange noises when you turn on the engine and warm up the vehicle. However, after the engine warms up, the noise decreases.
metal filings in engine oil
It seems very common for bits of metal to get into the oil pan from a broken timing chain. So if you change your car’s oil frequently (between 3,000 and 5,000 miles as recommended), you would notice the metal shavings.
When changing your vehicle’s oil, please don’t ignore the metal shavings around the filter or in the oil itself. It’s a telltale sign when the cylinder head valves are worn out due to a faulty timing chain.
Engine misfire
When the timing chain appears to be broken, it is normal for the valve movement to stop or undergo some interference. Therefore, they would not open or close at the right time to match the rising and falling of the pistons.
If such a situation occurs, the engine’s cylinder would have no combustion and the engine would misfire. This problem is quite alarming as it can lead to an imbalance in the air-fuel mixture ratio. Thus, you may find the vehicle’s engine stuttering and you may experience a choppy ride.
The engine doesn’tstart
Have you ever experienced that the car does not start? It could be due to some lousy startup issues. However, if you notice that the vehicle is delayed or will not start even when the starter engages, the timing chain may be in poor condition.
If the chain is broken, the engine components will not move properly and the engine will not start. This problem can cause the engine to stall while driving and is quite dangerous. In extreme cases, the pistons could be damaged when they hit the valves and the valve would also be bent.
The timing chain stretches
Constant use of the timing chain will cause it to stretch over time. This wear results from the constant work the chain does in moving the engine parts. This would degrade the timing of the valve movement, which would cause some other problems.
Therefore, the car would begin to consume more fuel, and there would be increased bumpiness, accompanied by low engine power when driving at low speeds. Assuming your vehicle’s timing chain is stretching, you would also hear an unusual rattling noise.
If you notice one or a combination of these signs in your vehicle, then the timing chain appears to be defective. Please make sure you find a solution as soon as possible. Don’t wait for the engine to fail before contacting the mechanic.
Timing chain replacement cost
A bad timing chain can cause serious problems for your vehicle. Luckily, car timing chain systems are built tough, so they last a long time. However, constant use of the vehicle and some external factors can cause the chain to wear out.
It is recommended to avoid driving with a broken timing chain as it seems dangerous. If you see signs of a faulty timing chain, it’s important to fix the problem before further damage occurs.
How much does a timing chain repair cost? Well, the cost depends on the extent of the chain damage. Again, you may find that the cost of replacing the chain will vary due to the difference in labor price.
However, you can get the parts for $200-$600, and the average labor cost should be around $400-$1,000. Essentially, you may need to budget anywhere from $600 to $1,600 to fix the timing chain issue.
You can check with your local service station to know the exact price of replacing your car’s timing chain. You can also buy the parts and have the chain repaired yourself if you can handle it.
Note: Timing chain replacement is a complex task and should not be attempted unless you are proficient. Therefore, it would be a better idea to take the car to an experienced mechanic.
frequently asked Questions
Q: What does a bad timing chain sound like?
When the timing chain is broken, you often hear a rattling noise coming from the engine. When you try to warm up the car you would hear the strange noise and after the car is warmed up the noise may start to dissipate.
In most cases, it can be due to a loose timing chain as it is interfering with the other components of the vehicle’s engine. Again, such a noise could be one of the timing chain tooth broken symptoms or a sign that the chain is worn out.
Q: What happens if the timing chain fails?
If the timing chain breaks, the engine will not start even if the car’s starter engages. This problem occurs because the engine does not have enough compression to start the car. If you have been riding and the chain suddenly runs out, the engine may fail.
In such a situation, the engine’s pistons would be damaged when they hit the valves. Also, you would find that such an effect would make the valve appear bent, causing further damage that can completely ruin the engine.
Q: How do you know if your timing chain is stretched?
When the timing chain appears stretched, the car’s engine runs rough when idling or accelerating, and you may find the check engine light comes on. One important thing that could also occur is the car losing power without warning.
If you then stretch, the chain can start hitting the cover and therefore you can hear a strange noise from the engine. It is important to fix such a problem in a timely manner, as a stretched chain can easily skip a gear, resulting in incorrect timing calibration.
Q: How long does a bad timing chain last?
The timing chain often lasts a long time, between 40,000 and 100,000 miles. The chain’s design is durable, so it will last longer than the timing belts found in some vehicles. Therefore, the timing chain may not need to be changed until after this duration.
Still, some external factors can cause the timing chain to wear out sooner than expected. When replacing the timing chain, be sure to have an experienced mechanic handle it as the process may seem quite complicated.
Q: Can you stretch a timing chain?
Adjusting the timing chain is possible because you can either tighten or loosen it to create synchronized movement within the engine. Such an action can cause the chain to move well with the timing chain tensioner.
The excessive pressure on the timing chain can often cause it to sag; hence the need for adjustments. Before thinking about tensioning the chain, you should first consider the needs of the gears connected to it.
Q: Does the timing chain check engine light come on?
When the timing chain fails, the check engine light comes on. By now you should know that the light on your dashboard comes on when the vehicle’s computer is wrong with the engine.
However, it seems difficult to know the exact reason for the light when it appears as various problems with the operation of the engine could be wrong. It could be due to a bad spark plug or even low oil pressure. Therefore, you should use an OBD2 scanner to determine if the timing chain system is in poor condition.
last words
The timing chain plays an important role in the proper functioning of the engine as it synchronizes the movement of the valves with the movement of the pistons. However, a broken chain can cause serious problems for the engine and the overall functioning of the vehicle. Knowing how to check for a bad timing chain may seem like a daunting task.
Therefore, it is important to educate yourself about the symptoms of a bad timing chain. With these signs, you can easily identify the danger and fix the timing chain system problems in time. In this way you can prevent further engine damage and let the car drive optimally.
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