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Minneapolis Moline Tractors Discussion Forum
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MM Z tractor piston

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Jason b.

09-15-2004 15:28:53




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Can you get the piston out with out taking off the blocks. I only need to get one out to replace the piston pin bushing




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Kelvin

09-15-2004 19:55:07




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 Re: MM Z tractor piston in reply to Jason b., 09-15-2004 15:28:53  
If its your bushing that's worn, chances are all the others are worn too. Probably be best to pull them all.



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Augie

09-15-2004 16:21:47




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 Re: MM Z tractor piston in reply to Jason b., 09-15-2004 15:28:53  
Nope.



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Joe Leising

09-15-2004 19:21:54




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 Re: MM Z tractor piston in reply to Augie, 09-15-2004 16:21:47  
I do not know this from personall experience, but I have been told by an MM mechanic that I trust rather well that you can change the rod w/o taking the jug off. He syas that there is just enough room to drop the piston down and pull the pin.

To do this you need to take the side plate off of the motor. Then turn the crank until the rod you wish to work on is lined up such that you can remove the bolts and rod cap. After removing the rod end from the crank CAREFULLY rotate the crank out of the way. Next pull the piston and rod assy down until you can turn the piston 1/4 turn and remove the pin retaining clips. From there you should be able ot remove the pin and replace.

I hope this is what you were looking for.

Joe

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MMark

09-16-2004 16:17:32




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 Re: MM Z tractor piston in reply to Joe Leising, 09-15-2004 19:21:54  
Hey guys you should be able to remove the piston and rod completely as a set. I have done it myself. There is a rather large chamfer at the bottom of the cylinder to ease in putting the piston assemly back in. That chamfer will compress each ring as you put it back in. Unless however you have overbored it enough that the chamfer is gone. I had to use a ring compressor when I put .125 over pistons in one of mine. (blocks were off the tractor) I have put them in with blocks on the tractor, but they were std bore. I believe MM marketed the Z to be able to be disassembled and reassembled from a milking stool if the tractor needed "refreshened".

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Jason B.

09-16-2004 04:40:23




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 Re: MM Z tractor piston in reply to Joe Leising, 09-15-2004 19:21:54  
Thank you I will give it a try.



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Augie

09-15-2004 19:28:59




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 Re: MM Z tractor piston in reply to Joe Leising, 09-15-2004 19:21:54  
Well, now that you describe it... yeah that might work.

The way my luck runs the piston would come down just far enough for the bottom ring to pop out of the sleeve...



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