9N no oil pressure

[Treevo]

I recently purchased a project 9N and not getting any oil pressure. I have rebuilt the oil pump using all new components, new pickup tube, and packed with grease on assembly. I have also replaced the oil pressure relief valve with new parts. I cant seem to get pressure once the tractor starts. How long should it take to get pressure on the initial prime? I did put heavy weight oil in the relief valve area, but not sure how much is needed? I pulled the line off the gauge to just make sure the gauge was not bad and still no oil coming out. I am afraid to ruin the engine from letting it idle for more than a couple seconds without seeing the pressure.

 

[R Geiger]

I got pressure while just cranking my 8n rebuild over with the starter.

what do you call rebuilding the oil pump?

 

[R Geiger]

I got pressure while just cranking my 8n rebuild over with the starter.

what do you call rebuilding the oil pump?

 

[R Geiger]

I got pressure while just cranking my 8n rebuild over with the starter.

what do you call rebuilding the oil pump?

 

[R Geiger]

We need the edit button to work!!!!

 

[Treevo]

New pump housing, Bushing, Gears, and Pick up tube.

 

[HFJ]

after rebuilding my engine, i needed to prime the pump. as per someone on this board, i used close to 5 ounces of 90W. i had pressure within a couple of seconds.

and ya, a working edit feature would be wonderful

 

[TheOldHokie]

(quoted from post at 17:28:28 11/23/16)
New pump housing, Bushing, Gears, and Pick up tube.

If you replaced the housing did you get the block align bored to match the new main bearing cap? That's probably not your pressure problem but it will likey be a problem down the road....

TOH

 

[ASEguy]

Something doesn't make sense to me. If it has not had oil pressure ever since you've owned it, and since you packed the gears with grease, you may be sucking air. Loose/cracked tube, bad gasket. Worse case, stripped oil pump drive.

 

[Tom N MS]

I agree--hadnt worked for months

 

[Qcmanjwp]

Or worn out housing where the gears go.
I have same problem I think. I just installed a oil pump KIT. It consist of 2 small inside pump gears and a larger drive gear with a shaft on it. I primed it with heavy oil and installed it, put pan back on and I had oil pressure. If I let it sit for an hour and start it back up, no oil pressure. I removed pan and oil pump/main cap and primed it again, reassembled and I had 30 psi oil pressure again. Let it sit for an hour and start back up and NO OIL PRESSURE ????

qcman

 

[Qcmanjwp]

I looked at the picture in the parts department here and It looks like it does not need to be aligned bored ???
My pump housing on my 2N is worn out, gets 30 psi when cold but as it warms up it goes down to near 0 to 4 psi.

will a new oil pump housing work the way it is when It is purchased?

qcman

 

[TheOldHokie]

(quoted from post at 16:17:18 12/28/16)
I looked at the picture in the parts department here and It looks like it does not need to be aligned bored ???
My pump housing on my 2N is worn out, gets 30 psi when cold but as it warms up it goes down to near 0 to 4 psi.

will a new oil pump housing work the way it is when It is purchased?

qcman

Unless you want to play main bearing/crankshaft roulette it has to be align bored/honed. Even in today's age of ultra-precision CNC machine tools when an engine is manufactured the main bearing caps and block are line bored as an assembly and the two halves of the main bearing housings are seldom if ever a perfect half circle. The caps won't interchange even on the same block and can't be reversed end for end without disturbing the concentricity/alignment of the main bearing ways. When you replace one of those caps with a new one you have to align bore the block and [u:95c00301f0]all[/u:95c00301f0] of the caps as a unit. There is no other way to make sure the newly assembled main bearing housing is going to be round and concentric with the other two.

TOH

 

[gizmo321]

(reply to post at 19:00:31 12/27/16)

This is same here. After rebuild, first startup was good. Ran engine maybe ten minutes. Next start, only minutes later, resulted in no oil pressure and death noises. Ended up disassembling bottom end to investigate.Results are wiped main and rod bearings from lack of lube. Removed freshly rebuilt oil pump(kit job, new drive gear, bushing,two pump gears). Now that I am in bad place,I discovered that the new oil pump gears are 0.012 in. shorter than original parts. This leaves a large gap inside the assembled pump. My opinion is that new pump,packed with thick assembly lube, was able to pick up the oil from sump. But after initial run and shut down, the thick stuff now washed away, the oil pump, new or not, is no longer able to pick up oil from sump.Unless it is repacked, I do not believe it will work. I am re-rebuilding mine with better fitting oil gears. Going to need bearings too. Not a great rebuild