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Rod bearings... 700 1989

posted by  chris herbst on  Sun Feb 17 04:40 CST 2002
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

Piston slap, perhaps. Usually that's in the #1 cylinder, but that's only a typical scenario, not a rule. Piston slap sounds like a bad connecting rod, but is really pretty much harmless. It's much worse in colder weather, and sometimes in the warm months it disappears altogether.

If you have a #3 connecting rod problem, I'd be surprised. Usually #s 1 and 4 are the ones that get it first, in that order. You would also be seeing significant bronze or copper-looking stuff in the oil. Change it out into a clean pan and see what you get. Keep in mind that you'll always see a little bit of visible metallic particles, but they should be very neutral in color, whereas a bad rod bearing will show up as a goldish hue, sometimes with big chunks of silver or copper material in the oil.

The big question mark for me is that it goes away when the engine warms up. Usually a rod knock is quiet when you first start the car, but gets noisier as you get the engine up to temp.
--
chris herbst, five volvos.






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