[AT] Low oil Pressure on 8n? 8v to 6v adjustment?

Mon Jul 15 04:51:34 PDT 2013

It depend on how low it gets when it is warm and under load.

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Will Powell
Sent: Monday, July 15, 2013 7:14 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment?

Got back to my Brother-in-laws yesterday. Took the line off from the guage
and started it up. Oil pumped out fine. Put my AC guage on, 10 lbs pressure,
same as what was on the one mounted in 8n dash. Is 10 lbs enough? I think it
is. 

Regards, 

Will 

----- Original Message -----

From: "charlie hill" <charliehill at embarqmail.com> 
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com> 
Sent: Monday, July 8, 2013 10:38:38 AM 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

If there is a side cover and you don't have a new gasket set don't take it 
off just to check. 

Charlie 

-----Original Message----- 
From: charlie hill 
Sent: Monday, July 08, 2013 10:06 AM 
To: Antique tractor email discussion group 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Yeah I forgot about it being a flat head. 
Is there a side cover over the valve train?  I never paid that much 
attention but there should be.  I also don't know about oil filters on 
a an 8N.  Don't know if it's a drain back filter or a pressurized by-pass 
type. 

Charlie 

-----Original Message----- 
From: Will Powell 
Sent: Monday, July 08, 2013 9:51 AM 
To: Antique tractor email discussion group 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Yes, ok, I will try the AC guage, can't hurt. I do see there is a plug in 
the oil line  manifold so putting the AC guage in will be easy... 8n is flat

head, no valve cover or rockers , a nywhere else to check for flow on the 
8n? 

I have to believe that the oil pressure is good enough since he was using it

for about 5 years and never had an issue. 

----- Original Message ----- 

From: "charlie hill" <charliehill at embarqmail.com> 
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com> 
Sent: Monday, July 8, 2013 9:29:52 AM 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Will if the fitting is the same an AC gauge should work.  I say should 
because while I believe the pressure range is about the same, I don't know 
if there is an issue with the orifice opening size in the gauge or line. 
It's worth trying.  First off take the gauge loose from the line and see if 
any oil 
squirts out.  If not then take the line loose from the tractor and repeat. 
I think the oil pressure is relatively low on both.  Also, the AC oil pumps 
have 
a spring and ball bearing pressure relief that controls to some degree the 
pressure. 
I suspect the 8N has some sort of pressure control on the pump. 

Take the valve cover off or look through the fill hole if possible and see 
how the oil is 
flowing to the rocker arms.  If there is plenty of flow you probably don't 
have anything 
to worry about as far as engine damage. 

Charlie 

-----Original Message----- 
From: Will Powell 
Sent: Monday, July 08, 2013 8:38 AM 
To: Antique tractor email discussion group 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Charlie, 

It's dash mounted. Good idea to check the line. 

Does any know if the  oil pressure on the 8n is significantly  different 
from the Oil pressure on an Allis Chalmers?  I have plenty of AC guages from

the C,WD,D17 that I could use as a test. 

Regards, 

Will 

----- Original Message ----- 

From: "charlie hill" <charliehill at embarqmail.com> 
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com> 
Sent: Monday, July 8, 2013 8:10:54 AM 
Subject: Re: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Will,  I don't remember if the oil pressure gauge on an 8N is 
dash mounted or on the side of the engine so this might not apply. 
I once had one of my AC tractors all of a sudden show NO oil pressure. 
After I got over the initial panic of thinking how much a rebuild was going 
to cost me I removed the valve cover and could see there was plenty of oil 
flow and apparent pressure.  Turned out the small steel tube that carries 
oil to the oil pressure gauge had become plugged up with oil sludge. 
I got it cleaned out good and the gauge went back to work just fine. 
Regardless where your gauge is mounted it would be worth your time to 
take the gauge off, then start the tractor just briefly and see how much 
oil is coming out of the fitting and how much pressure it appears to have. 
You can do that in a matter of a few seconds of running time.  That should 
tell 
you if it's the gauge or line to the gauge. 

Charlie 

-----Original Message----- 
From: Will Powell 
Sent: Monday, July 08, 2013 6:34 AM 
To: Antique tractor email discussion group 
Subject: [AT] Low oil Pressure on 8n? 8v to 6v adjustment? 

Hello, 

Helped my brother-in-law get his 8n running after it had been sitting for 
about 3 years. 

Cleaned out the fuel system. 

Engine was stuck. Took out the plugs, sprayed in some WD40. Let it sit for a

while. Rocked it back and forth in 4th gear. Could see a little bit of 
movement from the fan.  Hit the starter again and it turned over. 
Knocked/tapped a little bit as the valves loosened up then all was fine. 

Rechecked the electrics. Cleaned out the points. Finally got spark. Started 
right up ran like a sewing machine. 

Was 8v and we had an adjustable resistor so we did not fry the 6 volt coil. 
That was a pain. Bought a new stock resistor and  we put in a 6 volt 
battery. What's the process for adjusting the regulator back down to 6 volt 
from 8? 

Also, while it was running I noticed that the oil pressure guage was not 
moving. Throttled it up and I noticed a little bit of movement in the guage.

Is this normal? Could it be a bad guage, or, Is the engine worn out? It's 
not smoking out the exhaust. Next step is to try a new guage. 

Regards, 

Will 

Was tight 
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