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Model G oil pump
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Jerry (KY) View Drop Down
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Joined: 28 Sep 2015
Location: KY
Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry (KY) Quote  Post ReplyReply Direct Link To This Post Topic: Model G oil pump
    Posted: 01 Nov 2018 at 3:25pm
I have restored a 1949 Model G.  I am not getting any oil pressure or oil circulation. The oil pump is running backwards. How can this be?
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Dick L View Drop Down
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Joined: 12 Sep 2009
Location: Edon Ohio
Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 01 Nov 2018 at 3:49pm
What makes you think it is running backwards?

Take the plug with the slot in it and see what is behind it. If you have not had it out it could plugged behind the plunger.
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K-Mo View Drop Down
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Joined: 09 Feb 2013
Location: Atlantic, IA
Points: 91 		Post Options Post Options   Thanks (0) Thanks(0)   Quote K-Mo Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 5:49am
Try priming the pump where the oil pressure gauge is installed.
Remove pressure gauge and squirt oil in with an oil can to prime the pump.
Reinstall the pressure gauge and give it a try.
The Allis G like the Farmall Cub have the oil pump located a distance above the oil in the oil pan. A dry pump has difficulty pulling oil up from the pan. Squirting oil as describe will fill the pump with oil.
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 9:47am
Shop manual might help.

http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf

Gerald J.
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24712 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 9:59am
The ONLY way oil pump can run backwards is if teh engine is going backwards... as far as I know...
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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Jerry (KY) View Drop Down
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Joined: 28 Sep 2015
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry (KY) Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 10:05am
Sorry, it is not running backwards. I was looking at it the wrong way.
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Jerry (KY) View Drop Down
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Joined: 28 Sep 2015
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry (KY) Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 10:10am
I have the engine pulled apart now to look at the pump. Everything looks good. Will reassemble and try to prime the pump as you suggested.
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Alvin M View Drop Down
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Joined: 24 Jun 2018
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Points: 802 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Alvin M Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 10:39am
intake screen must be turned to front of engine or it can get air in it
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Jerry (KY) View Drop Down
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Joined: 28 Sep 2015
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry (KY) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2018 at 9:51am
I have reassembled the engine and attached it to the tractor. Primed the oil pump as suggested and fired it up. Running like a champ with good oil pressure. Thanks to everyone for the help.
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