Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Discussion Forum
:

No oil pressure on AC B

Welcome Guest, Log in or Register
Author 
Jim Sharp

05-24-2001 09:22:09




Report to Moderator

I purchase a B a month ago the oil pressure registered no oil pressure. I changed to a new guage and still no oil pressure. I cleaned out the line and that did not help. It runs OK without noise. Whats Wrong!! Help? Jim




[Log in to Reply]   [No Email]
Paul Md)

05-28-2001 17:41:17




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  

If you have been running the B a bit with no oil pressure at the gauge and it has not locked up or started making loud noises, you may have oil pressure but not to the gauge. Take off the oil filter and remove the gauge to see that the stand pipe is not pushed down too far and blocking the passage to the gauge. Very common quick fix done by so called mechinecs to tighten the pipe in the filter base.

[Log in to Reply]  [No Email]
Dale E.

05-27-2001 07:27:19




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
Jim, A lot of good ideas below. One other thing comes to mind that might help. The oil pickup tube in the oil sump had a screen on it when born. It could still be there. You'll have to drop the oil pan to find out. That screen could have some crud in it.( 30wt. non-detergent oil + 50 years=possibility of crud.) Just and idea! Good luck.



[Log in to Reply]  [No Email]
Tyler(WA)

05-25-2001 06:54:15




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
On a side note - when you do get things working again.....

The "Little Allis'" are famous for marginal oil management. They work OK but leave NO room for error in the oil distribution. If your oil pump isn't up to specs, you're hurting your engine.

A big error is to increase the size of the line feeding the rocker arm shaft. This line is small for a reason. If you increase the line size, the flow to the upper head will increase but at the expense of the lower half of the engine. You will end up with a great head to mount on your next block.

[Log in to Reply]  [No Email]
Dan

05-24-2001 21:25:27




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
My two cents worth, I had a similar problem after my tractor had sat over winter and the oil pump had lost it's prime. disconnect the oil line by the filter and using a pump oil can squirt oil back into the oil pump , it may work, it has for me and others I know of. Good luck



[Log in to Reply]  [No Email]
Tom Lyman

05-24-2001 21:20:42




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
Thanks for the help here. I am going to print and save this whole coverstaion for my "B" note book.
Tom



[Log in to Reply]  [No Email]
steve

05-24-2001 15:58:30




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
Jim, try the filter test as Butch suggests. You might even try to start it up with the pressue gauge off to see if you get a small flow out (route to a bucket). The pump actually has two outlets. One goes to the camshaft and bottom end as the guys say. The other feeds up to the rocker- valve area and it tees off on the way and goes to the filter and the governor lube. This method allows about 15% of the total oil flow to be filtered and dumped back to sump. As Butch said, you can have no flow thru the filter, but still have oil to the top and bottom end. This is not a guarantee. Checking the governor lube line and the filter can tube is a good start. Dont run a lot of time just cause it dont knock. Make your tests short and figure out whats happening.

[Log in to Reply]  [No Email]
Butch (H)

05-24-2001 10:07:36




Report to Moderator
 Re: No oil pressure on AC B in reply to Jim Sharp, 05-24-2001 09:22:09  
Jim, Since it runs OK you probably have oil pressure to the bearings. The gauge is reading the pressure feeding the filter. Remove the filter and there should be a pipe several inches long and about the size of a pencil sticking up from the base. If it isn't there the oil bypasses the eliment and your not going to read pressure on the gauge. Look to see if the tube is stuck in the filter. You can also remove the small oil line that feeds the governor and start it up to see if you indeed have pressure to the bearings. If the tube is inside the filter and no oil comes from the disconnected oil line don't run it anymore and let us know so we can tell you how to re-prime the pump.

[Log in to Reply]  [No Email]
Jeremy

05-24-2001 10:35:21




Report to Moderator
 Re: Re: No oil pressure on AC B in reply to Butch (H), 05-24-2001 10:07:36  
Wrong! The model B doesnt have pressurized bearings. They rely on the squirts from the cam.
If the gage don't have pressure ,the pump has lost its prime or broke the drive pin.



[Log in to Reply]  [No Email]
Butch (OH)

05-24-2001 12:00:06




Report to Moderator
 Re: Re: Re: No oil pressure on AC B in reply to Jeremy, 05-24-2001 10:35:21  
Yes Jeremy, you are technically correct in that the rods are not pressure oiled. The mains are pressurized to what ever extent the plug in the front end of the cam restricts the flow through the cam. The gauge reads from the the inlet side of the filter housing, thus if the the rod that extends into the filter media is not in place the oil can bypass the filter at the base and return to the sump unfiltered with no restriction and thus, no reading on the gauge. The rod sometimes pulls out of the base when the filter is changed and thus no oil pressure on the gauge, but oil is till flowing through the cam and lubing the bearings. Seen it happen many times. Checking for the tube in the filter housing is allways a good (and easy) first step when the old "no oil pressure" question is brought up here, especially when the engine appears to be operateing normally otherwise.

[Log in to Reply]  [No Email]
Jeremy

05-24-2001 14:24:00




Report to Moderator
 Re: Re: Re: Re: No oil pressure on AC B in reply to Butch (OH), 05-24-2001 12:00:06  
Butch I don't want to bat this thing to death but, the mains are not pressure oiled either they have catches that funnel oil to the mains. These engines could run awhile without oil pressure and not make a sound but the bearings are being ruined. I understand your point with the oil filter and you are correct I just did't want somebody to mis-understand and ruin their engine.



[Log in to Reply]  [No Email]
Jim

05-25-2001 08:44:29




Report to Moderator
 Re: Re: Re: Re: Re: No oil pressure on AC B in reply to Jeremy, 05-24-2001 14:24:00  
Thanks guys for all the good ideas, I will try them out until something works. You are a wonderful resource---there is nothing like this wonderful asset anywhere!! I will let you know when I get it to going--so others can benefit. THANKS, jIM



[Log in to Reply]  [No Email]
Butch (again)

05-24-2001 15:09:17




Report to Moderator
 Re: Re: Re: Re: Re: No oil pressure on AC B in reply to Jeremy, 05-24-2001 14:24:00  
Hey Jeremy, Sounds like both of us know how it works, it's just my terminology that doesn't suit ya. Next time I'll say oil flow instead of pressure. Let's get the guy going again.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy