Despite what others say stop leak will work if only small crack in solid (not bad rusted) metal. About 5 years ago I got M that had been sitting in ple barn for about 30 years running. Old tractor came to life and ran great, no outside oil leaks, uses no oil, clutch and brakes like new (and I drove them when they were new) BUT it was getting small amount of coolant in oil. Never could pin point leak but determined in was in lower part of block having noyhing to lose poured in 2 bottles of Prestone HD stop leak and it has not leaked a drop since.
About 10 years ago bought 1987 GMC tuck and discovered it had long crack through one of the block drain plugs that was seeping coolant, poured in stop leak, drove it 100K miles leak free. Every time I changed coolant out it would go to leaking until I added another bottle of stop leak.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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