Re: farmall m stuck pistons

Posted by Pat Rivers-Bowerman on May 31, 2004 at 19:21:57 from (142.166.251.178):

In Reply to: farmall m stuck pistons posted by pedro on May 31, 2004 at 12:09:29:

The pros have the same grief too.

Was just by an engine re-builder's shopin a dairy-town where I have my IH bits in.

They had the two-cylinder block from a green tractor [John Deere 720 - am I allowed to mention that, here ?]

It had stood out in the Back Forty for 17 years. Its new owner, a collector, had managed to get one huge piston out; the other was not shifting at all, so he brought it in.

Anyhow, the shop has it in a big press, with a big piece of round stock on piston crown, liberal doses of penetrating oil and gingerly brought hydraulic pressure up to 2,000 psi.

The BIG aluminum piston had 4 rings - but was grooved for 6. And the oil control ring was mounted on the skirt below the gudgeon pin - so there has to be plenty to stick fast.

Not shifting as yet - it's a solid bore [eg: no liner] so a cracked block would be fatal ....

Will let you know how they make out - in event, it may work here.

Regards
Pat from New Brunswick

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