Re: Dealer say oil pumps don't need rebuilt on H

Posted by Slappy on October 28, 2004 at 03:47:27 from (143.88.86.44):

In Reply to: Dealer say oil pumps don't need rebuilt on H posted by Charles Myers Sr. on October 27, 2004 at 17:48:20:

I am rebuilding the oil pump on my H right now. I'm planning a complete engine overhaul this winter and I want to get everything as close to original specs as I can. I agree that the bearings are the most likely cause for low pressure - I know I have the same problem as described by others - engine heats up and the pressure drops from 45 to 25. That being said, I do believe that the oil pumps will show wear over time. I have been in three different H oil pumps lately trying to find a good one to put on the rebuilt engine. One had a worn shaft allowing side to side movement. All had gear backlash that was out of spec - the manual calls for 0.006, pumps ranged from 0.010 to 0.014. All also had enough endplay to produce galling of the cover plate - between 0.006 and 0.008. I would guess that all of these pumps would provide adequate oil pressure, as Allen discussed, I still get 45 psi on start-up with some of the measures out of spec. But I'm hoping that by replacing the worn parts I'll see pressures near 60 psi after the rebuild.

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