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'47 8N Oil Pressure

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Frank Goebel

06-23-2001 09:44:37




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To anyone who can help,
We have a 47 8N (going by the clutch linkage & serial #) with a front mount distrbutor, which may or may not make a difference. I don't have a manual nor have the time to get one at this moment. I have read the archives about no oil pressure problems and the man who rebuilt the tractor says its probably a broken pickup tube. The articles in the archives relate to a late model 8N on the oil pump location. Before I start taking things apart, I want to make sure of the location of the pump and if there is a picture on a web site of the pump location I'd appreciate that info. also. I figure on changing the pump and tube while the pan is off just to make sure there is no further problems. We always had good oil pressure until I cranked the tractor up after it sat a week and there is nothing. I have been an auto mechanic for years and love working on antique tractors my father-in-law has. But with limited availabilty of parts I want to cover all of the bases beforehand. Any help is greatly appreciated! Frank

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John Smith

06-23-2001 15:21:11




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 Re: '47 8N Oil Pressure in reply to Frank Goebel, 06-23-2001 09:44:37  
Frank, you may have lost the pump prime. This can happen when a tractor has been sitting for a period of time without being started. It usually happens because the oil pump pickup tube has come loose or the gasket on the oil pump is bad and the pump is "sucking air" rather than pulling oil up from the sump. Worn gears in the oil pump can cause it, too. It's a sign that something in the oil pump area needs attention. The easiest way I've found to prime the pump and get it going again is to remove the oil pressure relief valve from the front of the engine. It is a 15/16" nut on the top front of the timing cover just below the water pump. Remove the nut and pull out the spring and valve poppet. Get a trigger type squirt oil can and put the nozzle in the hole that the valve poppet goes into. Squirt several shots of motor oil into the hole. This oil will run down into the top side of the oil pump and collect on the pump gears. This is usually enough to prime the pump. Replace the poppet and spring and nut and fire it up. You should get oil pressure back again and may be able to delay the repairs indefinitely. If not, or if your oil pressure suddenly dropped to zero while the engine was running, remove the oil drain plug and verify that the pump pickup tube is still intact. It could have broken off at the pump which is above the oil level in the pan.

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roperboy

06-23-2001 09:59:31




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 Re: '47 8N Oil Pressure in reply to Frank Goebel, 06-23-2001 09:44:37  
frank, there are a couple things you could check first. make sure your guage is working properly and that the line going to it is not blocked or plugged. also there is an oil pressure relief valve that screwes into the front of the block on the timing cover. you will notice it has bigger head that the rest of the bolts. there is a spring in there,check and see if it is broken or something amiss. the oil pump is part of the front main bearing lower cap. hope this helps.

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layne

06-23-2001 09:53:19




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 Re: '47 8N Oil Pressure in reply to Frank Goebel, 06-23-2001 09:44:37  
look for holes. its not much help, but Ihope you get her fixed!



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