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Farmall & IHC Tractors Discussion Forum
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m rebuild ?

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gtg155

05-13-2005 12:05:23




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have an m that has not run in years. it was not stuck but had low compression. since the head was off for a valve job i dropped the pan and pulled a piston. the rings were gunked up and stuck in the lands. the sleeves have a minor ridge, i would say less than .005" can barely feel it with a fingernail. idealy the plan is to clean the lands and get new rings. hone the sleeves untill ridge is gone and have nice surface to break the new rings in. i would also like to get oversize rings and file fit them to compensate for the minimal wear on the sleeve. does this sound like it would work or are new sleeves essential? also where could i get oversized rings?

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wayne swenson

05-14-2005 12:45:23




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 Re: m rebuild ? in reply to gtg155, 05-13-2005 12:05:23  
.005" on one side of the cylinder plus .005" on the other side equals .010" diameter wear.
Using the formula (pi X dia.)to calculate circumference the wear (end gap on rings) you will have .031" of end gap wear compared to original specs. This will give your cylinder a working end gap of .040 or larger which equates to great loss of compression or large amounts of oil.
I would sincerely recommend replacement of rings & cylinder liners.
Your best bet is to measure the wear with an inside micrometer.
Just remember: .001" of diameter change equals .003" of ring end gap change.
Conversly, use a feeler gauge to measure the ring end gap at the bottom of the cylinder and re-measure just below the ridge at the top. Divide the difference by 3 to get diameter change(cylinder wear).

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captaink

05-13-2005 19:49:16




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 Re: m rebuild ? in reply to gtg155, 05-13-2005 12:05:23  
If by chance you can get a hold of an inside micrometer, get it and measure the inside of the sleeves for wear and taper (a sleeve wears more at the top). If it is minimal as you say I would just clean off the ring ridge hone and put in new rings. I really don’t think the oversize rings are worth it.



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RustyFarmall

05-13-2005 12:56:24




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 Re: m rebuild ? in reply to gtg155, 05-13-2005 12:05:23  
If the ring ridge is as minimal as you say I think I would just cut out the ridge, hone the sleeves, and install new rings.



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onefarmer

05-13-2005 13:05:50




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 Re: m rebuild ? in reply to RustyFarmall, 05-13-2005 12:56:24  
Ditto, buy/barrow/rent a ridge reamer. Currently doing this to my M that hasn't run in years. Sounds like the sleaves are too good to replace. I wouldn't worry about oversize rings.



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