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: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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