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 - The Engine Rebuild Kit - by Curtis Von Fange. I always liked engine rebuild kits. They have all the replacement parts for overhauling an engine without going to the store to get gaskets, special measuring tools, or miscellaneous parts. They come neatly packaged, clean and tidy. But it's important not to let that packaging lull you into a false sense of security. The appearance of matching sleeves, pistons, rings, and bearings can cause frustration and agony if not properly measured and installed in a workshop environment. Following c
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