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Timing Chain Information

Engine Timing Chain
The timing chain is located in the front end of the engine and is used to drive the engine camshaft. The timing chain is driven by a gear on the crankshaft and then drives the camshaft gear. The camshaft turns at half the speed of the crankshaft, so the timing gear on the camshaft will be 2 times the size of the timing gear on the crankshaft. The timing chain and timing gear sets should be changed on most cars and trucks every 120,000 miles, or when excessive wear is indicated.

Typically you will notice a performance decrease or a slapping noise from under the timing cover as the timing chain wears out, or the timing chain tensioner has failed. On overhead cam engines the timing chain will have a hydraulic timing chain tensioner that uses engine oil pressure to keep tension on the timing chain. overhead cam engines may also use one or more timing chain guide rails to route the timing chain and keep the chain from making noise.

On some more exotic cars, there may be 2 or more timing chains that drive each individual camshaft and will have multiple timing chain tensioners and guide rails. A trained professional should always change the timing chain, as most timing gear sets require special timing tools to get the engine camshafts in proper timing. Drivewire carries all of the OEM, genuine , timing chain kits, timing gears, and guardrails at discount prices.