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Re: M602 Engine Noise

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Alan K

05-27-2013 22:24:18

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I think I had read one time in a ZT operators manual (I may have to look again to make sure) if you short out each spark plug, one at a time, if the noise disappears it would be a rod bearing, (could be a piston pin as well I would imagine) if the noise doesnt disappear it would be a main bearing, but didnt the ZTs have roller bearings on a couple of the mains? Ill have to find the book and check it to make sure how it was worded.

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05-31-2013 06:20:48

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 Re: M602 Engine Noise in reply to Alan K, 05-27-2013 22:24:18  
Mystery sound is found. Number 4 cylinder seemed to be closest to problem and back rod bearing is loose and spun around. I was able to feel the wiggle through the oil filter opening and now the oil pan is off crankshaft journal is pretty well scored.

Coolant is a steady drip out of back of water pump so that most probably had a lot to do with the failure. I wonder how that back bearing gets lubricated since my oil pressure was good even with it flopping around back there.

Thanks for all the help and now it is time to get the check book out.

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