Posted by 550Doug on November 20, 2022 at 17:58:27 from (141.193.149.5):
The engine oil plug on my Case 446 garden tractor (Onan engine) has been leaking, so I've drained the oil and replaced with new oil but the plug will not tighten. I thought it was a gasket problem but it seems to be a thread problem, The plug has a 1/2 x 20 thread. I've now drained the new oil and found a thin circular piece of metal that looks to be part of a thread from the engine as the thread on the plug is good.
I have purchased a single oversized oil plug to install but it seems to have a fine thread on it. I don't want to install it and wreck more threads. What is the scoop on using oversized oil plugs? A Double oversized oil plug also came with the set I purchased, but it seems to be too big.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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