Weigh the piston assembly if you"re worried. The 4 ring design is "early" design, the 3 ring is "late" design. Later rings will be slightly different than early but 3 ring is more current. piston skirt length should be close to same, wrist pin to top of piston should be same, oil control ring may be wider, multipiece insted of plain or narow space multipiece. Ford tractors have same situation, balance problems with mixed 3/4 ring pistons is not noticable. 3 ring piston might have a little more blowby on worn cylinder but pressure of 120 or so is not going to be much. Diesel pistons are more of a concern- the 4 rings are needed for 250+ pound cylinders. RN
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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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