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 - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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