8 N just overhauled by pro's, No oil press

Billybuck123 · Feb 16, 2015

I recently had my 8 N overhauled by professional, installed motor , Primed oil , the oil does not build press , I can disconnect return line at governor & hold thumb over it & it builds pressure but hook it up & its free flows with no press build up. Maint shop said they installed gasket between pick up tube & oil pump, I hate to remove this heavy oil pan ...?

Dave from Texas · Feb 16, 2015

They sometimes run with very low pressure. My 9N does the same thing. I told the guy at the Ford place that I wanted to see a good oil pressure. He told me maybe and maybe not.

fixerupper · Feb 16, 2015

Something tells me an oil galley cleanout plug wasn't put back in. I haven't been into a 8N engine for so long I don't remember if it has any internal cleanouts. I had something similar happen to a Willys engine in a military generator. A reputable machine shop rebuilt the engine and the owner wanted an updated bigger oil pump installed. Seems to me a new hole had to be drilled for a mounting bolt for the oil pump and when the machine shop drilled the hole they went too far and drilled through an oil galley. There was no oil pressure because the oil was dumping out of that hole. It took me quite a while to find the problem.

kathleen kanzler · Feb 16, 2015

check your oil preeure releif valve anf replace if nessary

Billybuck123 · Feb 16, 2015

(quoted from post at 15:46:32 02/16/15) check your oil preeure releif valve anf replace if nessary

Where is it?

Russ from MN · Feb 16, 2015

Recently I watched a video on the startup of a P51
mustang, and the pilot ran an external electric
oil pump for a minute before trying to start the
engine. I have heard of mechanics doing this on
car and tractor engines, has anyone ever done
that? I think my friend used a power steering pump
with an electric motor running it, sounds like a
good idea to me.

old · Feb 16, 2015

You will get more and better idea of what is up down in the Ford 9N/2N/8N forum down lower.
Could be a number of problems including a poor rebuild job
Oil pump pick up maybe loose. Relief valve stuck or bad and it is up front of the engine and has a sort of acorn nut holding it in. May have a bad oil pump or worn one seen that before on one I had a few years back and had to polish the plate down to remove the gear groves

Billybuck123 · Feb 16, 2015

(quoted from post at 16:00:16 02/16/15) You will get more and better idea of what is up down in the Ford 9N/2N/8N forum down lower.
Could be a number of problems including a poor rebuild job
Oil pump pick up maybe loose. Relief valve stuck or bad and it is up front of the engine and has a sort of acorn nut holding it in. May have a bad oil pump or worn one seen that before on one I had a few years back and had to polish the plate down to remove the gear groves

ok where is that?

Steve@Advance · Feb 16, 2015

Russ, yes that is a common practice, especially on performance engines. I used to have a cut off distributor housing for SB Chevys. No gear on the shaft, stick in in, run it with a drill until the oil pressure came up. Then put in the real distributor, get everything ready, fire it up, bring up the RPM. A necessity with flat tappet cams!

old · Feb 16, 2015

Where is what. The oil pump pick up can be felt by draining the oil out and then reach up and see if the pick up will move. If it moves you got a problem thee and the pan has to be pulled to fix. If the oil pump plate is worn you again need to pull the pan and then remove the oil pump pick which is also part of the pump that may need work. Also having an I-T manual FO-4 would help you a lot

Billybuck123 · Feb 16, 2015

(quoted from post at 16:10:44 02/16/15) Where is what. The oil pump pick up can be felt by draining the oil out and then reach up and see if the pick up will move. If it moves you got a problem thee and the pan has to be pulled to fix. If the oil pump plate is worn you again need to pull the pan and then remove the oil pump pick which is also part of the pump that may need work. Also having an I-T manual FO-4 would help you a lot

The oil press relief valve , think I found it...

Traditional Farmer · Feb 16, 2015

If they are really professionals they'll stand behind their work take the tractor back to them and tell them to fix it.

old · Feb 16, 2015

Up front of engine sort of below the water pump. I-T manual show a picture of it

Steve@Advance · Feb 16, 2015

The return line, I assume it's from the oil filter? That uses a bypass type filter if I recall correctly. How much flow are you getting from the return hose? Should not be much. there is supposed to be a restrictor orifice somewhere in the filter system, otherwise all the oil will flow through the filter instead of going through the engine galleys.

Someone on the Ford page will know this...

Tom-NoCenTX · Feb 16, 2015

Quit fooling with it. You will let the rebuilder off the hook, as he will not have to stand by his work after you pull the pan. TAKE IT BACK, acall him right now. Tom

fixerupper · Feb 16, 2015

Id do what Traditional and Tom suggest and take it back to the rebuilder.

Goose · Feb 16, 2015

I never took an engine off the stand until I'd spun the oil pump by whatever means and had pressure.

Saved my neck on a Buick 3.0 V6 once. There was a thin gasket under the oil pump plate. Two gaskets were stuck together and I didn't catch it when I assembled it. The thickness of one gasket was enough to render the oil pump inop.

37chief · Feb 16, 2015

That may be common practice for air craft engines. While in the Navy if our planes sat for more than 3 days, we would need to pre oil the radial engines with a external pump set up. Stan

DeltaRed · Feb 16, 2015

Take it back to the rebuilder! touch one bolt and
you may 'void' any warrantee. Call them
ASAP(preferably yesterday)

tractorguy2 · Feb 16, 2015

The line to the governor is the return from the
oil filter. I wouldn't think you would have much
pressure there.

I would try a different gauge.

Billybuck123 · Feb 16, 2015

gage is good, Thanks though

JMOR · Feb 16, 2015

(quoted from post at 23:47:33 02/16/15) gage is good, Thanks though

he restriction is in the center post of the oil filter canister, 0.059 inch hole.

Billybuck123 · Feb 16, 2015

(quoted from post at 20:54:00 02/16/15)

(quoted from post at 23:47:33 02/16/15) gage is good, Thanks though

Click to expand...

I see the hole and cleaned whole filter housing, its flowing but no pressure, help be fore I take pan down... thanks

ss55 · Feb 17, 2015

Is the shop that overhauled it refusing to look at it?

Tom-NoCenTX · Feb 17, 2015

Why so you refuse to refuse to respond to anyone asking about the "professional" that you say rebuilt the engine? If you keep fiddling with this thing, he has absolutely no obligation to even take a look at it, much less stand behind the rebuild. Why have you not called him and give him the opportunity to stand behind the rebuild?? If you find major problems now with the rebuild -- after you take the pan off and more -- then he has no obligation to even look at it. You may be out another rebuild with no recourse. Tom

Billybuck123 · Feb 17, 2015

(reply to post at 09:54:18 02/17/15)

Sorry for late reply, the shop has been helpful, I just figured it out with every ones help The problem was not letting the tractor run long enough to build pressure along with priming the heck out of it had to take throttle to half throttle before I see pressure now it builds as soon as it fires, thanks to all

8 N just overhauled by pro's, No oil press

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