These pumps wear out. The shaft wears and if bad enough wears into the housing. Have replaced many shafts over the years and usually the housing is ok even where the shaft is worn. End clearance is critical of course, I start with out any gasket, if it binds at all I add one shim gasket at a time. Covers on the H don't usually warp much but can easily be trued up with a flat surface and sandpaper. Also, look at the relief valve. If it is worn or wrong one installed. Over the years the parts some how got mixed up, and a lot of relief valve plungers were installed during routine overhauls that is incorrect. The correct one is straight all the way from one end to the other. Wrong one has a slightly smaller diameter with shoulder . That one will run about 45 psi and correct one will run about 65 to 70 psi full throttle and good engine. First M I ever overhauled at dealership , customer was complaining about oil pressure and oil consumption as dealer had done a ring job on it winter before. It had that wrong regulator valve in it and of course it got new sleeves then but was an inframe overhaul so no new cam bearings or other goodies. I found several more of them in both the H's nd M's over the years including my dad's 52 H which is mine now.
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