Anyone ever reused pistons and rings in an identical block?
#16
Racer
Join Date: Jan 2009
Location: Adelaide South Australia'79 5spd twin turbo
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Well there you have it, plenty of opinions, qualified and otherwise, interestingly the 2 guys who have real world experience Brad and Myself both said, whatha! give it a go anyway. It is only an engine, a collection of parts, it will go together and function. How well and for how long is the X factor. Knowing the expense of a new set of rings, compared with buying yet another "cheap runner" engine I would assemble it with the best of the old rings. I say that because my labour costs me nothing, as does yours, if it doesn't work it can all be undone for a new set of rings to be fitted.
I'm reluctant to reuse cylinder head gaskets, however given the costs of 928 ones I would be putting some sealant on them prior to reuse. As a sealant I use Loctite 515 gasket elliminator, for a head gasket I might use Loctite 510 Flange sealant, it is recommended for higher temperatures.
Good Luck
Cheers Roy
I'm reluctant to reuse cylinder head gaskets, however given the costs of 928 ones I would be putting some sealant on them prior to reuse. As a sealant I use Loctite 515 gasket elliminator, for a head gasket I might use Loctite 510 Flange sealant, it is recommended for higher temperatures.
Good Luck
Cheers Roy
#17
Burning Brakes
Join Date: Aug 2013
Location: Northeast USA
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I know I'm gonna get ripped for this but it never hurts too bad to ask. If you have identical 4.7 Euro S blocks(90k M28/11 and M28/12) with identical tolerance pistons can you switch the good rings,rods and pistons to the block with the bad rings(low compression 30-60 in all 8)? I think the answer is new rings on the bad blocks pistons but I want to verify since my extra pistons w/ rings "look" good. Gunar
Why you ask did I not just go the extra route? This my first 928. Its not collectable. Its a learning experience. If this had been a collectable car then we would have gone through it entirely. The engine was relative low miles (77K) and the holes were in very good shape. And at the time I didn't realize that a Mercedes machine shop could have done the lapping job on the cylinders and I wasn't about to bring it to a shop that doesn't want or know about hypereutectic cylinder boring/lapping. So putting new chrome and iron rings in an unprepared block is too risky so we stuck with the originals undisturbed from their position in their respective cylinders. Not a hack, a cheat
Fronkenstein