Thread: Timing chain
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Old 10-13-1999, 09:20 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
To address your last question:
When the timing mark on the crankshaft harmonic balancer is at TDC, { Zero degree mark }, there is also a cam timing mark on the front of the cam. If this mark is lined up right on with it's mark, then the timing has not been affected and the chain is not severly streched. That is where the off-set timing keys I mentioned earlier are used to compensate for chain strech. This is easily seen by simply removing the valve cover and hand turning the engine over in it's normal direction to TDC.
There is still a possibility of chain fatigue on high milage engines without visible strech.