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HELP!! no oil pressure

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babara

05-19-2003 02:04:05




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First of I apologize for not having any idea of what I talking about here so please bear with me. I am writing this for a friend.
This is getting to be a desperate and expensive situation. so any help would be greatly appreciated.
He purchased 1951 or 52 8n tractor.shortly after that it rared up on him and broke oil tube and spun the rod bearings. Had engine rebuilt, now it cant keep the oil pressure You have to prime it before starting to get oil pressure. if it is kept running it maintains pressure. if you shut it of and restart it there is no pressure. They have rebuilt the pump gears and the oil pump housing and it still contimues to do the same thing.
so far $4000 and maybe 6 hours drive time in 5 months since purchasing. going on the second month with no income as he is a logger who depends on a tractor to assist the skidder. We are in a very rural area of tennessee and the work is being done by a mechanic with a great reputation as an auto mechanic.
any thoughts or suggestion ASAP before he shoots the tractor and buys a mule :>)

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barbara

05-19-2003 11:55:38




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
also.... skidder is the cable wench type - it doesnt have the boom ( thinger ma jiggy-doofer gizmo -whatever you call it)



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barbara

05-19-2003 11:52:17




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
Thank yo all for your advise . I am passing it along and I will be back in touch.

He has qit a large skidder tha he uses to bring timber down from the mountain side to a pile in the logging yard where he saws it to length ad uses the tractor to bring the logs to the side of the log truck for loading. The skidder is too large to move around in the yard. He had a hired hand with a tractor to do the work before. The guy had a stroke and is still recovering - mean while his sons are off with the tractor doing whatever. the mechanic I also feel may not be to experienced with this thats why I mentioned he was an auto mechanic- good intentions but then again what would I know I am just a girl with a computer. (grinning)

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Just curious

05-19-2003 07:16:08




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
Sounds like you got some good advice,but I like ZANE,I was wondering what a N tractor can do to help a skidder that would stop the operation when it broke.What did he use before he got the N? Just curious N Ga.



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ZANE

05-19-2003 05:29:46




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
Do not use multigrade oil in the N engine. Use 30W or even 40W since you are having this oil pump problem.

I think that you either have a leak in the intake side of the pump @ the intake tube or a portion of the old gasket left on the cover plate or no gasket at all on the cover plate or a bent cover plate. Sucking air somewhere.

Also if the shaft of the pump drive gear has excessive wear or loose motion it can cause this problem. Or if the pump has previously worn so much that the gears have cut into the sides or the cover of the pump it will not ever be right.

I would suggest that you buy a complete new oil pump and a new pick up tube for the engine so that you will be assured that you don't have this problem in the future since you depend on it for a living. Maybe even change mechanics. The N tractor isn't an automobile!

I have logged a good bit in my lift time too and I was wondering what part the N plays in helping the skidder????

Zane

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Hobo,NC

05-19-2003 04:43:32




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
a quick test for your oil pump. Get a 1/2" piece of tubeing ( plastic or rubber) Hook it to the center of the oil pick up tube, you will see this after you remove the oil drain plug. Disable the ignition. Put a finger over the other end of the tube. If you feel a vacuum ( sucking on your finger) you have a good pump. You should feel a vacuum as soon as the motor starts to turn over. The pump has to pick up the oil to pump it. Normal to see about 5" of vacuum here. If no vacuum you will need to check the pump and pick up tube. You can do this test with the pump in your hand to. It don't matter how big a leak you have on the engine side of the pump you should feel it trying to suck oil as long as it is primed. I hope he has 30 or 40 wt oil in it sounds like oil is to thin or hole or lose pick up tube.

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Rob

05-19-2003 03:39:08




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 Re: HELP!! no oil pressure in reply to babara, 05-19-2003 02:04:05  
Well you might be using an oil that isn't suited for the 8N oil pump. Don't use synthetic oil or a multi-weight oil like a 10W40. Heavier multi-weights might work but the specs call for an SAE 20 in this weather and SAE 30 this summer maybe. Some guys will use an SAE 30 or even 40, just depends on the oil pressure. There is an oil relief valve on top of the timing gear cover on the front of the engine. Looks like a bolt with a large head. Remove that bolt, it's a nut actually, and there is a gasket, spring, and plunger under there. A little flat spot on the plunger is suppose to be there but maybe if the plunger is missing it could be a problem. Make sure the plunger can seat properly, nothing inside holding that open. On the off chance it's the spring you can stretch it some or, if you want to get technical, it's tension spec is 31-33oz. at 1.380in. Pump a can of oil in through that hole to prime the pump and see if it starts working for you.
Two other things lead to a loss of prime in the oil pump are one a loose oil pickup tube or some other leak in the tube. You had that problem but maybe there is still a crack up by the pump. One guy said this:
You can feel this by removing the drain plug and putting your fingers on the "bell" of the tube which is directly above the hole. It should feel springy, but solid. It's not uncommon for the tube to crack right at the point where it is silver-soldered into the oil pump body, causing it to suck air, lose prime, prime slowly or not at all. A cracked tube will feel "spongy" and dead.
Problem two is that the pump isn't within specs:
Worn cover plate and excessive end play has been tightened up by fiddling with the gasket thickness. One guy was talking about 0.005" for end play before he was happy. Fill the pump completely with grease before reassembly and you won't have to prime it that first time anyway.
I hope your mechanic is working from the book on this. You can get the specs in the FO-4 Ford Tractor manual. The manual is available at farm/ranch stores, tractor parts dealers, and a lot of tractor dealers.
I got some of this information from the archives of this great board. It has only worked about 90% of the time lately but it's working this morning. You may want to search for yourself. I used "oil pump prime."
Good luck.

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