Farm Equipment - G Oil Pressure (long post, sorry)

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G Oil Pressure (long post, sorry)

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=48267
Printed Date: 23 Aug 2025 at 10:08pm
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Topic: G Oil Pressure (long post, sorry)

Posted By: Chalmersbob
Subject: G Oil Pressure (long post, sorry)
Date Posted: 31 Mar 2012 at 5:34pm

I just got my rebuilt G started, but I don't have any oil pressure. I primed the pump first, have a good gauge on it, but have nothing. Yesterday I pulled the engine out about 2" so I could drop the oil pan to check the pick up. I wasn't sure if it was in right. It is about 1/4" off the bottom of the pan. I installed a T under the oil gauge and with a hand pump, pumped oil into the oil lines obtaining 20 pounds of pressure, enough to open the relief valve. I had oil coming out of the cam, the oil filter, and the oil pick-up tube. Today I bolted it back up and restarted it. Still no oil pressure. I added 2 more quarts of oil, 5 total, and attached my pump to the oil pressure tube again. I pumped it up to 20 pounds again, but it will drop off to 0 after I stop pumping. I'm ready to pull the engine off again and pull the oil pump off. Any Ideas what I'm missing? Sorry for the long post

Replies:

Posted By: Dick L
Date Posted: 31 Mar 2012 at 7:02pm

Did you have the oil pump apart? Have you taken the relief valve apart to make sure the poppet is seating?

Posted By: Chalmersbob
Date Posted: 31 Mar 2012 at 8:31pm

Dick, I had the pump apart, checked tolerances and removed the relief valve. It will hold 20-25 lbs of pressure before it pops Thanks. Bob

Posted By: Chalmersbob
Date Posted: 02 Apr 2012 at 10:55pm

I took the pump out today and found that the gasket kit had the wrong thick gasket.

It should have had a large hole in it with 2 horseshoe cutouts, instead it was the same configuration as the thin paper gasket. I didn't realize the problem when I put it together the first time, having never worked on a N62 before. The gasket was solid with 3 holes in it. The pump gears chewed the gasket material and jammed it in the gears and popped the shear pin in the drive gear. As far as I can tell, none of the gasket material got beyond the pump. Having had gasket sealer on it, it was gummy and stuck to the gears and the housing. Thanks Bob