Re: engine noise diagnosis

Posted by Rauville on July 18, 2005 at 08:06:02 from (209.180.79.60):

In Reply to: engine noise diagnosis posted by n8terry on July 17, 2005 at 17:50:50:

Back when I would fiddle around with engines, a bad rod bearing would sound loudest when the rpms were up. Wrist pin noise while uncommon did occur at times. If it's a loose wrist pin that's slidding back and forth, the noise probably wouldn't be as consistent during operation as a bad rod (especially, when you get a double-knock).
Try the steel rod as described below, or a piece of garden hose held to your ear.
Another method is to cut the oil filter apart and spread the paper element out, and look for clues with a magnifying glass. Any bad rotating part is going to leave some metal particles behind.
Good luck!

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