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No Oil Pressure after rebulit

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Art Kirkpatrick

07-24-2000 08:11:47




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I have done a complete rebuild on a 1948 Ford 8N tarctor and after putting it all back together it started right up but I have no oil pressure! I then tore the whole thing back down and rechecked all oil ports and cleaned them and blew everything out with compressed air. I then put it all back together and still had no oil pressure! I checked the gauge and its good I tokk off the oil line from the filter and there is no oil being pumped, I rebuilt the oil pump when I overhauled the engine(there isn't to much you can mess up on the oil pump! Am I missing something??
I Need Helpppp!!

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DavidH

07-24-2000 15:39:31




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 Re: No Oil Pressure after rebulit in reply to Art Kirkpatrick, 07-24-2000 08:11:47  
Art,
I had the exact same problem and have seen several postings by others too. It seems the oil pump needs to be primed initially. I packed mine with grease which caused it to be primed. Good luck!



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dillweed

07-24-2000 08:56:45




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 Re: No Oil Pressure after rebulit in reply to Art Kirkpatrick, 07-24-2000 08:11:47  
You must prime the oil pump somehow. Most N experts pack the oil pump with an oil soluble grease when they rebuild the pump or replace it with a new one. That way it will be primed and able to pick the oil right at first time start up. I found this out the hard way also. But there are other ways without taking down the engine. Here are some things that have worked for me. Remove the oil filter and fill the filter holder with oil - some may trickle back through the lines and into oil galleys and maybe into the oil pump. You can also remove the oil pressure relief plug/plunger on the front of the engine and with an oil can squirt oil down into the oil galleys there. But the best way that I have found is to remove the pan oil drain plug. Look up in the hole and you will see the pump pick up tube. Fashion you a rubber hose that will fit snug over the end of the pick up pipe. Make the hose long enough so that you can bring it down, over the side of the block and up for about a foot. Fashion a funnel to put in the elevated end of the hose. Pour oil into the funnel and hose. Defeat the engine ignition system so the engine will not start. Have someone crank the engine allowing the pump to take the oil out of the hose and prime itself. Pass/pump as much oil as you think is nessary to prime all the oil galleys if you want to. Of course refill with oil. Hope this works for you.

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RLL

07-24-2000 20:30:08




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 Re: Re: No Oil Pressure after rebulit in reply to dillweed, 07-24-2000 08:56:45  
Had the same problem with two rebuilds. Before you drop the pan, try removing the oil relief plug in front of block and squirt oil in. Crank engine without starting. You should get enough presure to read from turning on starter. May not always work but it worked for me. Good luck



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Bill from MO

07-24-2000 08:55:42




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 Re: No Oil Pressure after rebulit in reply to Art Kirkpatrick, 07-24-2000 08:11:47  
Quick way to prime: Remove oil guage and inject oil into tubing by some means, oil squrit can or anything to force oil into system. Some will route its way to the filter until it's full and the rest will go to bearings and oil pump. Use the same oil that you use in your engine. I have to do this to one of my show 9Ns every year when I get ready to show! Good Luck!



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Gaspump

07-24-2000 08:44:14




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 Re: No Oil Pressure after rebulit in reply to Art Kirkpatrick, 07-24-2000 08:11:47  
This problem came up just a few days ago. I had the problem with a brand new rebuilt pump a few months ago. Tolerances are critical in the pump and they are notorious for being hard to prime. You may try to fill the oil filter with warm oil and let stand overnight and it may fill up the pump. Or, you could force oil into the system and try to get it primed. My solution was to drop the pan, have a good machine shop re-build the pump and re-install. Critical step in overhaul is to fill the pump with assembly grease to insure priming! Other main cause of failure to prime is a cracked or loose pickup tube. Good luck!

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