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'39 B Oil Pump Questions

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08-17-2000 07:30:58

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Installed the new rocker arm assembly and all of the push rods and finally got the engine to turn over!!!! Todays' problem is we don't have oil going to the top of the engine. Have drained old oil and put in 4 qt.s of new. Removed oil pan and it was clean as a whistle. Replaced oil filter (which isn't getting oil either) Removed the oil line running to the oil filter, started the engine, and no oil is coming out of the line. Questions: Where is the oil pump on a '39 "B"? Do I have to split the tractor to get to it? Do you need to prime the oil pump to get it started? Thanks for your insights.

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Paul from Michigan

08-18-2000 21:21:20

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 Re: '39 B Oil Pump Questions in reply to Greenhorn, 08-17-2000 07:30:58  
I know you got the pump to prime and now everything's OK, but one method I have used that works really well when overhauling any engine. Take a used freon container, or any container that will hold some pressure and has a top fill opening and a bottom outlet. Connect a hose from the bottom opening to the oil pressure gage hole, with a shut off valve in it. Put 2-3 quarts of oil in the container and put a fitting in the fill hole that can be connected to an air compressor. Pressurize the container at 20PSI or so an open the valve. Oil will flow thru all of the oil passages in the block, head, oil pump, etc. so when you start the engine you will have oil to everything immediately. Remember, 90% of hte wear on an engine occurs when you start it. I can't take credit for this idea, an old friend of mine showed it to me. Good luck, Paul

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08-18-2000 05:26:38

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 Re: '39 B Oil Pump Questions in reply to Greenhorn, 08-17-2000 07:30:58  
Thanks for the advice. Priming the pump worked. We actually got the old '39 "B" running and took it for a short drive last night. Now it's on to the body restoration.


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Dick L

08-17-2000 08:28:28

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 Re: '39 B Oil Pump Questions in reply to Greenhorn, 08-17-2000 07:30:58  
You do have to split the engine to get to the oil pump. I would pull the pan down first and make sure that the pickup is not pluged. You could pour oil down the oil pipe that comes out of the pump and try to prime it. The two things I have found is the pickup pluged and the back plate gets wore to where it will not pickup oil. You can resurface the back plate as long as the vanes are good. The gasket has to be the correct thickness.

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08-17-2000 08:20:27

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 Re: '39 B Oil Pump Questions in reply to Greenhorn, 08-17-2000 07:30:58  
The oil pump is at the rear of the camshaft. If you follow the lines from the filter and head they both come to a tee at the bellhousing which is screwed into the oil pump. The pump is driven by a pin in the rear of the cam and if it is sheared you must split the tractor to repair it. Most likely it has lost its prime and you can get it pumping by removing the lines and squirting some oil into the fitting and letting it run down into the pump.I would suggest that you remove the plugs and spin it over to get some oil moving before you start it again. If you continue to have trouble with it losing its prime the pump may be worn out,the gasket inbetween it and the block may be bad, or the pick up tube and strainer may be loose or cracked.

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Wes Byerly

07-03-2002 20:58:07

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 Re: Re: '39 B Oil Pump Questions in reply to Buych(OH), 08-17-2000 08:20:27  
After you were able to prime your oil pump. what was the oil pressure.

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