Re: 46 farmall h oil pressure

Posted by Slappy on October 13, 2005 at 02:56:28 from (143.88.85.82):

In Reply to: Re: 46 farmall h oil pressure posted by walter on October 12, 2005 at 19:41:05:

Yes, bad cam bearings will give you low pressure, but I think I would do two simple fixes first.

Make sure your oil gauge is good. If so, check the oil pump a little further before tearing the engine down again.

First, and I'm not trying to be a smart a** here, check the pump cover gasket. If you replaced it by making a new gasket out of regular gasket material you will have too much clearance between the cover and the gears and your oil pressure will be nill. The correct gasket is only 0.05" thick.

If your good with the gasket, next I would check the clearance on the oil pump gears, both between the body and the gears and lash between the gears. If they are out of spec, put new gears in (NOS gears are available). Also be sure that the shaft does not have any side play, if it does, you need a different pump body and/or the shaft is worn excessively.

Finally, (and this the the easiest fix) be sure that the gear end play isn't excessive as it will cut away at the pump cover. This happens a lot and causes oil to bypsss gears reducing pressure. If you find galling on the cover, measure the play between the pump body and the oil pump cam drive gear (write it down) if out of spec, knock out the pin, remove the woodruff key and pull the cam drive gear. Add shims (McMaster and Carr has them)to get the end play back into spec. Next have the pump cover milled flat, or if you have nothing but time on your hands, get a piece of plate glass, some grinding compound and do it yourself. Finally order a new gasket and reassemble.

Despite the fact that the pump is bathed in oil they do wear. I bougt three used pumps before I found a good pump body, and all had gears out of spec. I replace the gears, got the end play into spec and put it in my rebuilt H - oil pressure shot to 70 psi and hardly moves.

Once you know the pump is good, and the problem persists, it's time to think about the cam bearings.

Good luck

Follow Ups:

• Re: 46 farmall h oil pressure walter 12:50:36 10/13/05 (11)
  • Re: 46 farmall h oil pressure Slappy 03:07:07 10/14/05 (8)
    • Re: 46 farmall h oil pressure walter 06:26:12 10/14/05 (7)
      • Re: 46 farmall h oil pressure Slappy 07:42:46 10/14/05 (6)
        • Re: 46 farmall h oil pressure walter 09:27:08 10/14/05 (5)
          • Re: 46 farmall h oil pressure Slappy 16:30:27 10/14/05 (4)
            • Re: 46 farmall h oil pressure walter 17:21:54 10/14/05 (3)
              • Re: 46 farmall h oil pressure walter 19:52:51 10/14/05 (2)
                • Re: 46 farmall h oil pressure Slappy 06:34:31 10/15/05 (1)
                  • Re: 46 farmall h oil pressure walter 11:16:30 10/15/05 (0)
  • Re: 46 farmall h oil pressure El Toro 16:27:31 10/13/05 (0)
  • Re: 46 farmall h oil pressure ElToro 16:17:10 10/13/05 (0)

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