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Allis B oil pressure problem |
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JudgeguyBob
Bronze Level Joined: 31 Oct 2012 Location: PA Points: 12 |
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Posted: 30 Jun 2024 at 12:07pm |
I have a 1940 Allis Chalmers B. Engine totally overhauled. Oil pressure pump rebuilt.
When reinstalled on the tractor I primed the oil pump via the tube from oil filter base to the oil pump. Tractor started right up, oil pressure gauge ran right to the normal range and stayed there while tractor was running. Overnight oil pump would lose prime and if primed again would show normal pressure as long as the engine was running. Tightened all the fittings, with no improvement. Pulled the engine and flywheel, went over the oil pump, resealed the gaskets, replaced a fitting on the oil line from oil pump to cylinder head. Same result as previous. Replaced the tube through the oil filter and installed a new Wix 7011 oil filter. Oil pump still loses prime over night. Once it's primed the engine runs well with oil pressure with the needle staying stable in the normal range. What am I missing? Thanks for any advice or help! Bob
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PaulB
Orange Level Joined: 12 Sep 2009 Location: Rocky Ridge Md Points: 4727 |
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I have been working on these BE/CE engines since the late 60s. The reason that you loose prime overnight is: The check/pressure relief ball in the oil pump is not seating properly. If you got a pump rebuild kit or if you just did the work with what you have rebuild, you should always put the ball into the rotor and with a brass punch and heavy hammer, give the ball a good wack, then throw that ball away and assemble the pump with another NEW ball.
I have seen many work with what you have rebuilds that have a small rust spec on the ball and most all the time thins are just fine, then every once in awhile that rust spec get into just the right place to allow it to loos prime. Another thing to look for is a very fine crack in the threads of the oil screen holder., or mangled threads on either end of the pick-up pipe. Any thing that is not air/oil tight will allow loss of prime.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
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JudgeguyBob
Bronze Level Joined: 31 Oct 2012 Location: PA Points: 12 |
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Thanks, Paul! That all makes sense. When I have time and help, we'll pull the engine and flywheel and go over the pump with special attention the ball and other things you mentioned. Comments much appreciated!!
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HudCo
Orange Level Joined: 29 Jan 2013 Location: Plymouth Utah Points: 3536 |
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pick up tube haas a crack i think it is a 3/8 x 9 pipe npt threads
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JudgeguyBob
Bronze Level Joined: 31 Oct 2012 Location: PA Points: 12 |
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Thanks! I'll check that out.
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Lon(MN)
Orange Level Joined: 11 Sep 2009 Location: Elk River,MN Points: 1968 |
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Had that same problem last week. Complete rebuild on the engine and new parts in the oil pump. I took the engine out three times and the pan off. I could not find a problem. I took a used pump off the shelf, put it in and the prime loss problem went away.
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http://lonsallischalmers.com
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juniorp53
Bronze Level Joined: 16 Mar 2012 Location: United States Points: 43 |
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any imperfections in the ball and seat will cause loss of prime every time .... just replace the ball its nothing special just a plain 5/16 ball bearing mcmaster has them .. i cant for the life of me understand why any of the rebuild kits dont include one for the amount of grief not replacing it causes
a new rotor still available you can also search here on the forum as this same subject is mulled over every few months |
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