Farm Equipment - WD45 Radiator Cap

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WD45 Radiator Cap

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=28547
Printed Date: 01 Mar 2025 at 10:18am
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Topic: WD45 Radiator Cap

Posted By: deereequipment1
Subject: WD45 Radiator Cap
Date Posted: 04 Apr 2011 at 6:31pm

Howdy all.

My WD45 has a non-original radiator cap.
the guy i bought it from said someone told him it was a non-pressure type of radiator, where other people told him differently.

Anyone know how to tell?
I also see from Agco, a 4 lb and 7 lb cap available. Not sure which way to go, depending on whether the radiator should be under pressure or not.

My WD parts tractor has different type of cap (the way the tabs are on the cap).

Any thoughts/suggestions?

Thanks.

Replies:

Posted By: Ted J
Date Posted: 04 Apr 2011 at 7:55pm

According to my manual, it is a 4 lb. system

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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17

Posted By: deereequipment1
Date Posted: 04 Apr 2011 at 8:09pm

Thanks Ted!

Posted By: RickM(MO)
Date Posted: 04 Apr 2011 at 10:13pm

My WD45 manual says it is a 7 lb. cap. When I had a 4 on it I would sometimes get some overflow out the overflow tube when it was warming up and the thermostat opened. I had my radiator cleaned out and pressure checked so I knew a 7 should work. Changed to a 7 lb. and have not had any problems. But 4 should work OK too and be less pressure to cause a leak somewhere in the radiator or hoses.

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Missouri Allis Chalmers Club Member; 1954 WD45 (NF), 611LTD & 811GT Lawn Tractors