When I worked at John Deere dealer we pulled the pistons because they had run into problems with preassembled sleeve and pistons before. I never found any problems on the ones I pulled though that I remember.
Also, it is a whole lot easier to check the sleeve fit in the bore without a piston in it before you install the o-ring in the block. And speaking of o rings in the block, those grooves in the block, they were a problem on the older tractors. No easy fix either.
Both IH and Case you could repair with factory supplied parts. Not easy, but could do it. Never had to repair a IH block but of the few Case tractors we overhauled, we had to do some. Sent them out to do it.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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