In fact, using a motor oil viscosity other than the factory recommended oil can result in a check engine light and engine damage. The timing chain is located inside the engine which requires several steps to get to the timing drive, making timing chain and timing drive component inspection and replacement difficult. These components are inexpensive when compared to labor costs. Skip to content Installation Tips. What does a timing chain do? When does a timing chain need to be replaced? Signs a timing chain needs to be replaced include: Later model VVT applications will generate engine codes and check engine lights prior to engine rattle Older, pre-VVT applications will generate engine rattle What causes timing chain noise?
What signals timing chain damage? Should I also replace sprockets? What causes a timing chain to break or wear? How important is oil quality? If you notice any of these warning signs, it's advised for you to contact a local mechanic as soon as possible, so they can diagnose the exact cause and make appropriate repairs as needed. There are two ways to achieve valve timing in a combustion engine. The first is the two-gear method, which includes the crankshaft to camshaft gear direct connection.
This is the method used in most types of heavy equipment and big trucks. The timing chain method is more common with consumer vehicles and high performance engines. Over a period of time, the timing chain can stretch, which can cause the chain to skip a gear on the cam or crank shaft. If this situation occurs, it's likely that the timing chain is damaged and needs to be replaced as soon as possible.
If the timing chain breaks, the loose metal rolling around inside the motor can lead to serious engine damage. It's recommended by all automotive manufacturers to change the engine oil and filter every 3, to 5, miles.
The reason for this is that over time, oil begins to separate as it heats up and is exposed to natural solvents found in gasoline. If the timing chain begins to wear out, small metal pieces can break off the chain, and find their way into the oil pan. When you have your oil changed , and the mechanic tells you that there were small pieces of metal inside the oil as it drained or in the filter, it's a good indication that your timing chain is beginning to fail.
Metal shavings are also common with extensive wear with cylinder head valves, keepers, retainers and other cylinder head hardware. It's critical that if a mechanic or technician tells you that there is metal shaving in the oil that you contact a local ASE certified mechanic to inspect this and make appropriate repairs as soon as possible.
Unusual sounds are also a common warning sign that a problem exists inside your motor. Under normal conditions, the engine should have a consistent, smooth sound that indicates everything is running as it should. Although initially more expensive, this practice eliminates the need for re-works or additional labour for your customer at a later date. When diagnosing an elongated timing chain, it is almost impossible to access timing marks or references on modern engines.
In most cases it is best to use an oscilloscope to check cam and crankshaft sensor correlation. A simple test involving the amount of degrees you can move the crankshaft can also be a useful way of determining if you are having trouble with your timing chain. Remove the distributor cap, and turn the crankshaft, clockwise. When the rotor starts moving, stop turning the crankshaft, and read the degree meter. Note of where the rotor is, and turn the crankshaft, counterclockwise, until the rotor moves.
Read the degree meter, and see how many degrees the crankshaft moved. If it is more than 10 to 15 degrees, your chain is too loose.
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