Re: Just want to know why

Posted by ltf in nc on December 14, 1999 at 14:26:24 from (206.228.213.214):

In Reply to: Just want to know why posted by Tim W on December 14, 1999 at 13:33:27:

Tim, One of the most difficult engine components to machine correctly is a connecting rod. During manufacture the rod is difficult to hold due to the width at the crank bore and the wrist pin being different lengths. Plus, after the cap is cut from the rest of the rod, it must be reattached and the bore is then out of round. The bore must then be machined accurately as to its diameter while controlling parallelism and to the wrist pin and re-establishing a new center point of the crank bore diameter in relationship to the wrist pin center. This is the reason you do not want to rotate a rod cap. If the engine was assembled with the witness marks aligned to a specific pattern and the engine ran for a long life you have established that that orientation works. Therefore you are best advised to reassemble in the same order to benefit from this tried and proven setup. Minor tolerance problems were overcome in the original run in period and will not have to reoccur if the original assemble is duplicated.

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