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Allis B oil pump failure?
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Tgtack View Drop Down
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Joined: 15 Apr 2019
Location: NW Ohio
Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tgtack Quote  Post ReplyReply Direct Link To This Post Topic: Allis B oil pump failure?
    Posted: 13 Aug 2019 at 1:32pm
So was driving the B the other day, and she just quit in middle of road. Never done that before. Fuel in tank and fuel was on, so tried cranking it over (is hand crank). Engine was "tight" first couple turns, then loosened up and fired right off. Checked oil gauge and zero pressure. Immediately shut it off and trailered home.

Plenty of oil and clean, pulled oil filter and spun engine over, no oil. Tried reprime, still no oil.

At this point, figure was oil pump failure.

Anyone have a picture of the camshaft end so I can see what the drive for the pump looks like? From what I can tell, is some type of pin.

Also looking for pump source. Am aware of rebuild kits, rather get one already to install.

Any other thoughts on possible failure mechanisms of no oil pressure before I split it in half?
1939 AC Model B, 1952 AC Model G, Case 195, numerous Wheel Horse, Hit Miss Engines, currently looking for a AC B10 garden tractor
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
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Points: 5636 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2019 at 5:26pm
Shop manual might help:
http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf

Gerald J.
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Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tgtack Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2019 at 5:46pm
Thanks much for the manual, will help a lot. Don't see any discussion of the drive pin as far as possible replacement. Hopefully can tell once pan is off.
1939 AC Model B, 1952 AC Model G, Case 195, numerous Wheel Horse, Hit Miss Engines, currently looking for a AC B10 garden tractor
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2019 at 7:18pm
Here is a picture of the pin inside the camshaft along with a picture of the pump stem the fits over the pin.

A new pin can be installed without removing the camshaft. It is not easy but can be done if your hands are not the size of a baseball glove. I took these pictures for a person that did get a new pin in.











Edited by Dick L - 13 Aug 2019 at 7:22pm
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Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tgtack Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2019 at 1:49pm
Dick, is the pin tapered or an interference fit? What holds it in? Any idea where a new pin cab be purchased?
1939 AC Model B, 1952 AC Model G, Case 195, numerous Wheel Horse, Hit Miss Engines, currently looking for a AC B10 garden tractor
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2019 at 3:25pm
I have always replaced them with a roll pins. It is not tapered.

If you try to replace it without removing the camshaft you have to retrieve the broken pin to keep from it getting in the crankshaft and camshaft gears. That will be the biggest challenge. Sometimes when the pin breaks it gets pushed out some to where you can pull it out on the one side. The other side can then get punched out. They seem to have been peened on both outside ends some to hold them in.

You will have to check to see how your luck is running!

If you can get it out you will have to grind a taper on the end of a roll pin to get it started.
The roll pin can stick out some but not a lot. Maybe a eighth of an inch each side. You will need to use a smaller pin to make sure you have the pump lined up to drive the roll pin thru the slot in the pump stem using a hand crank.    

You will be able to tell if you can replace it in the tractor after you remove the pan and look and feel up under the camshaft end where the pin is located.   
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Steve in NJ View Drop Down
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Points: 11909 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2019 at 4:56pm
Make sure the oil screen isn't all full of gunk or RTV. They plug up easy!
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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