Farm Equipment - D12 oil pressure?

Print Page | Close Window

D12 oil pressure?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=49280
Printed Date: 24 Aug 2025 at 7:56am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D12 oil pressure?

Posted By: Leon
Subject: D12 oil pressure?
Date Posted: 20 Apr 2012 at 9:13am

I have been doing long overdue mechanical maintenance on my Aunts D12. I changed the oil and filter. I replaced the WIX filter with a NAPA Gold. I also changed the gauges that have not worked in the past 40+ years. I don't have any oil pressure. I have been told that there could be a problem with the oil filter type/brand.

Any suggestions would be greatly appreciated.

Thanks

Leon

Replies:

Posted By: JeffMOnt
Date Posted: 20 Apr 2012 at 9:24am

Here is a page that shows the differences and which one you need.

http://personalpages.tds.net/~thompson_wp/acb/filter/oilfilter.htm" rel="nofollow - http://personalpages.tds.net/~thompson_wp/acb/filter/oilfilter.htm

Also make sure that the tube was in place when you put the oil filter on. Sometimes they pull out with an old filter.

Posted By: Leon
Date Posted: 20 Apr 2012 at 9:46am

Thanks Jeff,

I'll take a closer look. The oil press gauge that I replaced the original gauge with, goes to 100 psi (5 psi first mark), but it should still come off the peg if it has 10 psi or more, I would think.

Posted By: CTuckerNWIL
Date Posted: 20 Apr 2012 at 12:43pm

A 100 psi oil gauge is NO good on your tractor. You need a 30psi gauge for it to show up after warming the engine. If thee tractor has been sitting a while, it might need some oil dumped down the line to prime the pump.

-------------
http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: JimD
Date Posted: 20 Apr 2012 at 12:54pm

I'll second the gauge vote. A 100lb gauge is designed to operate in the 50 or so range, and is terribly callibrated for 15 that you will likely see. Start with the right gauge. 25lbs is the tops for that tractor. You should be able to find a 30 or we can sell a reproduction.

I would not expect a 100 gauge to read anything at all at 5, or even 10 for that matter.

JimD

-------------
Owner of http://www.OKtractor.com" rel="nofollow - OKtractor.com PM for an instant response on parts. Open M-F 9-6 Central.

We have new and used parts. 877-378-6543

Posted By: wigtrain
Date Posted: 20 Apr 2012 at 2:09pm

All of the answers so far are correct. First is that AC tractors unlike cars use a bypass oil syatem. What that means is that the oil pump pulls oil from the pan and creates pressure. This oil flow that goes to the filter is oil that is basicaly excess oil that is not needed for lubrication. It flows through the filter and then returns to the crankcase. To trouble shoot the system you need a gauge that has a max reading of 30psi or less. Your tractor when hot will be hard pressed to provide 20 psi if everything else is perfect, actual pressure is usually closer to 15. On a 100 psi gauge it may not read at all. At the same time as you replace the gauge check to see that the metal tube didn't pull off with the old filter. Without it ALL your oil will bypass into the crankcase. The hole size in the end of the tube is critical and almost as important as the proper filter. Both the filter and tube provide a restriction that creates the pressure for other parts of the system. Replacement tubes are available from others on this site. Making the hole in the end of the tube smaller will slightly increase your oil pressure but does so at the expense of proper filtering. Lastly while doing your maintenance your pump may have lost it's prime. Remove the fitting from the oil filter housing and pump fresh oil with an oilcan back towards the pump. That should prime the pump.

-------------
Jim Wiggin

Posted By: tbran
Date Posted: 20 Apr 2012 at 2:44pm

check the archives , lots of good info on oil pressure issues on d10 -ca etc with and w/o full flow filters.

Posted By: norm[ind]
Date Posted: 20 Apr 2012 at 7:13pm

we have the 30# gauges usa made 1-574-342-4545 can ship

Posted By: wfmurray
Date Posted: 20 Apr 2012 at 9:26pm

Put rings in my D/14 and a new filter,after a few hours i could hear a pecking sound . Took filter offand put on a fram 159 and added some lucus to oil .Cranked it up and it quieting down in about 30 seconds.Some time back someone on post said you could overhaul one and put a full flow filter on it and a 100 hrs it would be ready for another overhaul.

Posted By: Jack(Ky)
Date Posted: 20 Apr 2012 at 10:02pm

There is nothing wrong with a Wix filter as long as you didn't get hold of one that was made for a short time a few years ago when they changed the design for a little while. The NAPA gold is just a Wix with napa wrote on it. It should be #7011. If it was a Wix brand it would be #57011. I don't know why they changed the design that time but sure did mess them up. We had a case of them at work and I bought one of them and found out they didn't work right so we sent them back and got the new 57011's and they are just like the old ones and work fine on the old AC's. I know about the 100 lb oil pressure gauge first hand and I agree that you just need the right gauge.JP