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Used pistons swap...B21F 200 1979

posted by  Don Foster on  Tue Jun 17 06:54 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

Not a good idea. Once you remove a piston from the bore, it's impossible to reposition the rings in precisely the same orientation. So even if you remove a piston and intend to reinstall it, you should replace the rings and run a glaze breaker.

"...might there be problems in the fit between 'new' used piston and bore?"

Good point. You must be sure that the replacement piston is NOT an oversize piston. Likewise, you must confirm that the original bore is not an oversize bore -- unless it happens that the bore and replacement piston are the same amount oversized. However, it's likely that everything's the original stock size.

Keep in mind that if the donor motor is a turbo, the pistons are different from a non turbo motor.

How did you confirm that you have a worn wrist pin? That's an unusual problem for a B21.
--
Don Foster (near Cape Cod, MA)






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