As CNKS says, most likely the oil pump. Specifically the pot metal oil pump cover is warped. Common problem on this series of engines. Low cost fix if that is the problem. Drop the pan, remove the oil pump cover, check with a straight edge to see if it is warped. Get something very flat (piece of plate glass) 220 or so grit sand paper and sand the cover flat. Very thin paper gasket between oil pump body and cover may be blown. Only place I know of to get it is CIH. HTH.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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