: : : I am restoring a 1950 John Deere Model B - Serial # 270162. Today, while working under the tractor, I noticed that the threads of the oil drain opening were damaged. All of the threads have been sawed at at a right angle creating a channel the thickness of a hacksaw blade the entire thickness of the main case. The depth of the cut is equal to the depth of the threads, maybe a bit deeper. The previous owner used a cylinder head coolant drain plug instead of the standard pipe plug. It appears to turn deeper into the case than does the standard plug. Before I began the dismantling process, the tractor leaked from every opening so I don't know if oil leaked from the main (crank) case. The oil level always seemed to be okay when I checked it during a year or so of storage.: : : Any suggestions as to how to prevent leakage when the tractor is again filled with oil.? Teflon tape or teflon liquid? Or another type of sealant that can be easily renewed when the plug is replaced after each oil change? Any help will be appreciated. : : : : To solve all of your problems, take the Johnny Popper to the recycling plant and have them melt it down. Then go get yourself an INTERNATIONAL HARVESTER!!!! Much better tractor with fewer problems. I am a former JD owner who finaly learn and converted,the best move I ever made. : Melting the JD and buying a red tractor seems to be a bit extreme, I'd check the possibility of running a slightly larger hole thru the case and rethreading it for a little larger plug. I don't know if a Heli Coil would allow a proper seal, but you might check that too. I might consider blue or grey and red, but never anything pure red. IH (guffaw, snort) gimme a break! Another possibility would be to see if an O ring would fit near the head of the plug. Does it have a head? Hope you find an answer, Me Naw!!! We don't want to melt down any old tractors, no matter what color they are! Now about that teflon question, I find the liquid/paste to be far better than the tape. Plus it lubes the threads to help prevent damage. Good Luck!
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