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Allis Chalmers Discussion Forum
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Part# for my oil pump

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TroyR

09-17-2007 08:07:38




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Allis B#25550.Put my rebuilt head on,New rings,now I don't have any oil pressure I blew out all my lines and still no pressure.No oil getting to the oil filer at all.I can blow in the lines and I hear bubbles in the oil.This site has 2 oil pumps and no pictures how do I know which one to order?Thanks Troy in Wa.




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Dick L

09-17-2007 11:02:45




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 Re: Part# for my oil pump in reply to TroyR, 09-17-2007 08:07:38  
The easiest way to prime a pump on a Allis Chalmers B, C, CA, or RC is to remove the oil line that connects to the head. Clamp a foot long pice of rubber fuel line to the end and fill the hose with new engine oil with a pump oil can. let it drain down and re fill two or three times. Start the engine and run for a few seconds to make sure oil is coming out of the hose. You can do it without the hose. It just takes longer to get enough oil in the system and it is less oil mess when it catches its prime. This pump will not pump air out to prime its self.

For those that do not understand the small Allis engine oil pumps, you have to split the tractor to remove the oil pump.
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I prime the the pump before I warm up the engine to be able to re torque the head and re set the valve lash. I just did one and was planning on taking pictures but got in a hurry and didnt.

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old

09-17-2007 09:29:11




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 Re: Part# for my oil pump in reply to TroyR, 09-17-2007 08:07:38  
As the others have said you probably lost prime in the oil pump and of course blowing out the lines made sure of that. What does work since you can here that air get to the oil is a vacuum pump made for bleeding brakes on a car. They cost around $20 or so then you just hook it up and put suction on one of the oil lines till you have oil coming into the vaucuum pump cup. Doing that should reprime the pump and then you should be good to go

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El Toro

09-17-2007 08:56:17




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 Re: Part# for my oil pump in reply to TroyR, 09-17-2007 08:07:38  
A brake bleeder ball makes an excellent pressure vessel. You may need to remove the pump and set it in a clean container of engine oil and twist the drive gear until oil is being discharged. Hal



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JMS/MN

09-17-2007 08:24:05




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 Re: Part# for my oil pump in reply to TroyR, 09-17-2007 08:07:38  
Try priming the pump before replacing it. Force oil through the lines. Can use a suction gun in reverse, or make a brake bleeder type of setup. I used a NEW (so I could weld on it) 20 lb LP tank to make mine, a hydraulic reservoir would also work if you can plug the vent. Air regulator and shutoff valves are required.



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Texas Denny

09-17-2007 08:17:32




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 Re: Part# for my oil pump in reply to TroyR, 09-17-2007 08:07:38  
You probably do not need a new oil pump. These oil pumps are noted for losing prime after sitting a long time or a rebuild. Loosen the line from the oil filter into the crankcase. Make the break where it is the easiest. Force oil with a pumping oil can into the line going into the block - this line leads to the oil pump. Pump in fairly viscous oil such 30W. You'll need to push in as much as a cup. When you start the engine again, you should have oil pressure.

When you blew out the lines, prime was certainly lost but may have been lost just from disassembly. Blowing out the lines was a good idea. Loosing prime would have probably happened anyway.

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