Re: Diagnoisis engine noise

Posted by Janicholson on May 01, 2007 at 17:55:17 from (66.173.50.137):

In Reply to: Diagnoisis engine noise posted by agpilot on May 01, 2007 at 13:37:30:

The basic issue of interpretation of words into sounds (not to mention the differences between ability to hear) make the information you seak almost impossible to quantify. Experience and hundreds of hours of listening, then tearing down engnes is the only way it can be obtained in a usable form. unfortunately this is also a personal hard won talent that is nontransferable. Words like deep thump, or light tapping, or moderate knock, loose all meaning even between engines that are identical. Five mechanics diagnosed a bad rear main in a IH truck V8 in a 1600 loadstar. It was a broken flex plate. A badly worn valve guide can make noises identical to a broken ring, and seem localized to the same area when listening.
There are three rules.

If it is making new noise it is valve adjustment (if that doesn't fix it it is gong to be a lot harder to fix.

If the knock gets worse over one half hour's time it is toast. shut it off.

If it has a timing chain/tensioner and 150K miles it needs a new chain but it probably won't break anyway.

Good luck gaining the experience, and may the noise be comming from a customers unit.
JimN

Replies:

• Re: Diagnoisis engine noise agpilot 07:00:36 05/02/07 (0)

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