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Used pistons swap...B21F 200 1979

posted by  jkordzi on  Tue Jun 17 07:00 CST 2003
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last visit: Wed Sep 12 02:43 CST 2001
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If you doing this on the cheap, I'd go ahead and swap the piston. I think you could also use the old rings too, but don't be surprised if some of the compression rings are cracked, in which case you'll need to use new rings. In either case, consult the manual for the correct location on the piston for the ring gaps. Usually they are staggered. If you use new rings, get the "moly" ones, not the chrome ones and you'll probably be able to break them in OK. If you're going to replace the piston from below with the engine in the car, and have to use new rings, you may not have enough room to use a scratch hone, in which case I'd be tempted to use some 320 grit wet/dry paper and kerosene to make a new pattern on the cylinder. A little rough and ready, and certainly not optimal, but will probably work. If you're going to pull the engine, use a scratch hone on the end of a drill. You may be able to borrow one from a machine shop. Good luck.






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