Quote:
Originally Posted by JFP in PA
Yes, I do work on these cars, and have been called upon to reset the cam timing on more than one three chain motor that jumped time when the owner removed the tensioners without locking the cams while the engine was at TDC. You should never pull the tensioners on the three chain motors unless the engine is locked at TDC, and the cam lock is in place. To do so is inviting a disaster.
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Well then you should be using 2 cam locks, not a cam lock.
It would be interesting to understand what would you think could drive the cams to move independent of the chains as there is no driving force to rotate them at TDC to lose timing. I've had my 3 chain apart and set the timing without the cams locked, all that was needed was TDC as there is nothing to cause the cams to rotate independent of the chains. Tearing the engine down for the first time after an IMSB failure, I made the choice not to be at TDC because I thought I might have valve to piston interference if I rotated it. A poor choice as I can confirm through personal experience the valve springs will rotate the cam independent of the chain if not at TDC, and they will not, and indeed can not if the engine is at TDC. I prefer to complete jobs without unnecessary parts (cam plugs) and time (messing with the cam locking tool).
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