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Piston slap when warm? 700 1991

posted by  chris herbst on  Sat Dec 21 18:28 CST 2002
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

Volvo techs all over the world chased down piston slap. They put in new pistons, they did it all. But in some engines, it never ceased. The longer pistons (longer skirt) apparently curbed the problem, but I doubt it curbed the problem entirely. The only remedy in some engines is to replace the whole engine.

Piston slap when warm is not uncommon either. I see it frequently on Turbo cars. However, it could also be a knocking water pump. Unless you just replaced the water pump (not exactly like piston slap, but a rapping noise nonetheless) check play in the pulley. The knocking can be bad. But that isn't usually the cause... piston slap is pretty common.
--
Chris Herbst, in Wisconsin.






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