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Piston slap when warm? PAGING JOHN SARGENT!!! 700 1991

posted by  pablos on  Mon Dec 23 10:01 CST 2002
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last visit: Tue May 22 00:43 CST 2001
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I know you don’t want to hear this but I have come to the conclusion that there are no good (extra) noises when it comes to things automotive. Normal piston slap in a Volvo isn’t instant death, but I’ll bet it doesn’t extend engine life. If it seems to be getting worse so rapidly in a fresh engine, something is wrong, and it isn’t the oil.

I am NO expert on the “normal” piston slap associated with the late 80’s early 90’s Volvo motors. It is associated the looser, lighter motors designed to increase MPG. I have heard some issues ranging from the confirmed longer piston skirts helping, the lighter crank motors be prone, to the problem decreasing with the 94 et al motors with cylinder wall oil squirters. Some motors even had out of round bores that indeed did not clean up with an overbore and oversize pistons.

0.3mm is 0.012”, first normal oversize. Mahle are OEM quality.

Head planed 0.1 mm (0.004”) shouldn’t change things much…..hmm…

Go ahead and try some other oils. Yes try the 10W-40. Maybe an oil loaded with Moly such as Redline may help. Does your mechanic have a Moly additive just for a test? (I don’t really believe in long term “homebrew” oils, though, but it’s worth a shot.

Get that stethoscope out, just to confirm.

You know who is great at this engine? John Sargent. I’ll page him.
--
http://www.fidalgo.net/~brook4/oilslubesfilters.html






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