SailNet Community - View Single Post - Yanmar 1 GM Knocking
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post #3 of Old 06-28-2009
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not saying its not anything else but i had a yanmar guy say the most common knock from 1 gm's is a misfire, esp at idle. he said is an age thing with the injector being old and a bad spray pattern.

mine knocks too, so if you get it figured out please post it here
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