(800) 853-2651
SHOP NOW

Farmall h and m radiator cap pressure ratings?

R

rankrank1

Well-known Member
For the ole Farmall h's and m's that do have the pressurized radiator systems:

Which pressure rating cap was stock?

Which pressure rating is best?

Both 4# and 7# seem to be the two readily available common choices. What are you all running and why? I can make an argument in my head for either one. Just curious what your all thoughts are.
 
Pay the money and get the cap from CaseIH, or you can get caps made by OEM Tractor Parts from OEM, Steiners, or Steel Wheel Ranch. Mike at Steel Wheel Ranch knows what the caps he sells have for pressure--785-548-7437. Been in business for probably 40 years. Don't try to find one locally with the correct pressure, get an "official" one made for the tractor and don't be concerned.
 
Steiners offers both the 4lb and the 7lb version. CASE/IH catalog (Messicks) shows several factory OEM caps as well as aftermarket made options but that website does not list the differences on the choices as far as the poundage on cap.

Of course some of those options are for the early non-pressurized cap but I am not concerned with those as that is straight forward since that is different cap style which I now know thanks to the help from the YT forum and a previous post.
 
I may have found the answer to my own question. I found the Stant catalog online whom I remembered from my parts man days 20+ plus years ago while working my way through college. Stant is one of the biggest makers of OEM and aftermarket radiator caps for the entire engine industry (i.e cars, trucks, tractors, etc.).

The Stant catalog shows 4lbs as the proper OEM choice.
 
All I know is that in the 50's may dad's H with a pressurized radiator would leak out the overflow with temp in the 90's-100 at full load, and I do mean full load. I am guessing that was a 4 lb, but that is only a guess. If correct a 7 lb might have helped, or maybe not, because the engine temp in the afternoon would be on the edge of the red. Probably should have shifted down a gear. Also we did not use antifreeze in S Texas, that would have helped with the overflow also. For the way most old tractors are used today I doubt if it makes any difference.
 
(quoted from post at 02:36:13 06/23/13) All I know is that in the 50's may dad's H with a pressurized radiator would leak out the overflow with temp in the 90's-100 at full load, and I do mean full load. I am guessing that was a 4 lb, but that is only a guess. If correct a 7 lb might have helped, or maybe not, because the engine temp in the afternoon would be on the edge of the red. Probably should have shifted down a gear. Also we did not use antifreeze in S Texas, that would have helped with the overflow also. For the way most old tractors are used today I doubt if it makes any difference.
Click to expand...

I suspect you are correct. I imagine the 7 lb'er was an upgrade to the original stock 4 lb'er. Lots of people were working those things hard back in the day and then later adding super kits so the cooling system could use any help it could get. Increased pressure does increase the boiling temp of water so it would help. I am going to go with the 4 lb'er for now (got a new one for $0.99 on ebay earlier today). It will be an improvement over what was on there which I think was a 7 lb'er but since part of the gasket was missing it was more like a 0 lb'er.

I worked the ole h last weekend bush hogging weeds taller than the tractor for a neighbor. This was by far the hardest I had ever worked this tractor. While it did not overheat, it did spit a bit out the overflow which it had never done before even when worked on the mower conditioner doing hay.
 
You must log in or register to reply here.

Similar threads

G
1951 Farmall H - no Liftall
Replies
13
Views
478
NY 986
N
M
Farmall H Water Jacket Questions
Replies
5
Views
572
rcmedic
R
K
1943 Farmall H transmission project and mouse problem
Replies
5
Views
425
BarnyardEngineering
BarnyardEngineering
D
Farmall C Radiator
Replies
8
Views
644
560Dennis
560Dennis
G
1950 Farmall M Problems
Replies
12
Views
995
redforlife
R
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.

Copyright © 1997-2024 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

Back
Top