I had a machine shop in the 1960's -- 1990's. Zollner made most of the pistons on IHC engines. I remember the C 301 gas & LP as having a problem scuffing on the # 5 & 6 cyl's. Either IHC or Zollner had a service bulletin that stated increase # 5 to .005 & # 6 to .0055.?? I know we determined they diddn't have enough cam grind in the piston skirt. We bored & honed to their recommend specs, then put a Pefect Circle knurl on the skirt to bring it back to around .004. The knurl helped retain the oil on the skirt of the piston.Never had another engine score. I hope this helps. They only gave trouble doing the heavy field work. When you get your tractor running take a temp heat gun & see how much hotter the back cyl's run. Make sure you have a "A" plus radiator. Are any of your radiator shops using flow test equipment? I plow with my antique tractor & if you get the antifreeze mixture over 50-50 It doesnt cool as well.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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