If you can live with some oil consumption you can get by with more clearance. As the pistons and sleeves wear the worn piston skirts will allow the pistons to rock slightly in the sleeve. When this happens the rings will not be held squarely in the sleeve and oil consumption will be greater as a result. If the clearance is too great the skirts will break off and oil consumption will increase greatly.
I have overhauled many H and M tractors that had skirts broken off the pistons and the engines still ran fairly well. The worst one was an H that has six of the eight skirts broken off.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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