No oil pressure 35 A

Posted by fixerupper on June 05, 2013 at 09:29:39 from (100.42.82.30):

My 35 A ser. 416239 with the oil pump behind the flywheel had no oil pressure when I fired it up this spring. It did this years ago and it was a warped oil filter housing. That was fixed with a block of hardwood and a big hammer. This time that does not appear to be the problem. This is what I've done

1. Pulled the cover off the pump, cleaned and lapped the face by rubbing it on sandpaper on a plate of glass. Started with 80 and polished with 400 grit.

2. Packed it with grease, put it together with new gasket I made same thickness as the factory (I assume) gasket.

3. Ran tractor, no pressure.

4. Pulled crankcase cover, all lines are tight.

5. Removed pump, very light circular scratches from gear faces rubbing on newly polished face of pump so I assume the side clearance on the gears is not too loose. No oil in the suction side of pump.

6. Pulled pump out as far as drive gear would allow and checked/flushed suction tube through hole that mates with suction side of pump gasket was good.

7. Removed press relief valve in pump cover, cleaned and lapped seating surfaces with lapping compound. Someone had put a lock washer in with the shims to up the pressure.

Before I button this thing up and try it, is there anything else to look for? The suction tube side of the pump was dry of oil and there was no residual oil in the suction port, so it's not sucking oil for some reason. The pipe going from the pump to the sump is tight. Yes, there was enough oil in the crankcase. The crankcase did not have any junk in it. We've owned and used it since 1950 and it's been well cared for, but it is very worn. There was no rust, water or chunks of debris anywhere. I want to make sure it builds pressure this time because those bearings have already been run dry for a minute or so. Oh yes, I did cut out a little more relief in the cover gasket at the intake and discharge areas of the pump in case the gasket was restricting flow. That's the only glitch I can think of when I put it together the first time. Thanks. Jim

Replies:

• Re: No oil pressure 35 A AOS 1600 04:56:25 06/06/13 (0)
• Re: No oil pressure 35 A fixerupper 17:12:11 06/05/13 (0)
• Re: No oil pressure 35 A elkcagg 14:57:48 06/05/13 (0)

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