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Minneapolis Moline Tractors Discussion Forum
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Re: M602 Engine Noise

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Cliff Nelson

05-27-2013 21:03:46
75.100.34.114



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Check the rocker arm stands carefully. My M-5 was assembled incorrectly before I got it and one of the rocker arm stands was broken where the short bolt holds it to the head. The nut on the long bolt backed off and allowed the stand to raise up with the pressure from the push rods. That made a clicking noise that was hard to find. Everything sat in place with the engine off so it looked ok. Good luck in finding your problem.

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Alan K

05-27-2013 22:24:18
208.83.191.64



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 Re: M602 Engine Noise in reply to Cliff Nelson, 05-27-2013 21:03:46  
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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cleddy

05-31-2013 06:20:48
70.184.208.103



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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.
Cleddy

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