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Cracked piston. Why?

Old 07-30-2007, 06:43 PM
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JohnW
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Default Cracked piston. Why?

See attached photo. I pulled this piston from my 160DZ after it wouldn't idle for poo. No prop strikes, no back fires, etc. Ran great all year then all of a sudden it started shutting off at idle. Tore down the engine and this is what I found. The only other item that was "off" was one of the wrist pin guide has worn abnormally and was 1/2 the thickness it should have been. Other that that, the engine showed no abnormal wear. Ring is fine and basically the same size as a new one. Sleeve seems fine. Cam is OK and does not show abnormal wear, etc. Any ideas on why this piston failed? Thanks - John
Old 07-30-2007, 06:44 PM
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JohnW
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Default RE: Cracked piston. Why?

Maybe I should attach the photo, eh?
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Old 07-30-2007, 06:53 PM
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Troy Newman
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Default RE: Cracked piston. Why?

Hmmm thats an odd one I have only see this a couple times. Once was years ago with the 140L piston on an engine that had been detonating in the mid range. The guy just kept running it this way for a long time and eventually the top of the piston cracked but worse that this.

The other was a test piston that I ran a couple years ago. Contact Richard he should take care of it for you.

www.yspartsandservice.com

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Old 07-30-2007, 06:54 PM
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krayzc-RCU
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Default RE: Cracked piston. Why?

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