Re: I know that but isn't possible for chain to jump?

Posted by Triktoy on August 17, 2008 at 11:52:18:

In Reply to: Re: I know that but isn't possible for chain to jump? posted by Sidney on August 17, 2008 at 08:13:45:

Possible but very rare. Buz has explained many times how to measure chain stretch; i.e. put 19 mm socket on crank pulley bolt. Rotate engine clockwise until notch on crank pulley lines up with the 0 degree timing mark. Now remove distributor cap and turn engine very slowly counterclockwise. Immediately stop turning when the distributor rotor starts to move. Look at the notch in the crank pulley and the timing marks again. If engine rotated more than 12 degrees before the distributor rotor started to move then chain is seriously stretched. 8-12 degrees = moderate stretch, but no urgent cause for concern. 3-5 degrees = a tight chain.

Others have explained that if the tensioner pad is seriously worn or the tensioner shaft starts sticking in the retracted position, you'll hear a loud, continuous grating noise when first starting up the engine in the morning from the chain rubbing on the metal timing cover.

Follow Ups:

• Re: could chain be off a tooth on crank gear if cam gear is fine? Sidney® ™ 03:30:06 08/19/08 (2)
  • Re: could chain be off a tooth on crank gear if cam gear is fine? buz 21:07:09 09/19/08 (0)
  • Re: could chain be off a tooth on crank gear if cam gear is fine? buz 20:47:51 09/19/08 (0)

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Comments:
: Possible but very rare.  Buz has explained many times how to measure chain stretch; i.e. put 19 mm socket on crank pulley bolt. Rotate engine clockwise until notch on crank pulley lines up with the 0 degree timing mark.  Now remove distributor cap and turn engine very slowly counterclockwise. Immediately stop turning when the distributor rotor starts to move.  Look at the notch in the crank pulley and the timing marks again.  If engine rotated more than 12 degrees before the distributor rotor started to move then chain is seriously stretched. 8-12 degrees = moderate stretch, but no urgent cause for concern. 3-5 degrees = a tight chain.

: Others have explained that if the tensioner pad is seriously worn or the tensioner shaft starts sticking in the retracted position, you'll hear a loud, continuous grating noise when first starting up the engine in the morning from the chain rubbing on the metal timing cover.





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