Allis B Oil Leak
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=178667
Printed Date: 10 Oct 2025 at 11:41pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis B Oil Leak
Posted By: sjwelchjr
Subject: Allis B Oil Leak
Date Posted: 27 Feb 2021 at 7:53pm
Hope all of you are well. It has been almost 20 years since my last post on this forum. I restored my 1950 B to original condition in 1999 and this forum helped me then as a 20 year old. I’ve used my tractor in the garden for many years since then with many hours of success. I have to come back with a question and a request for help. I have a front seal of some sort that is leaking and I wanted to see how hard it would be to repair it. I will try to upload a picture to follow this description. My tractor has dripped the occasional drop from this area for many years but it has now turned to a steady stream of oil while the engine is running. Any help and advice would be appreciated.  
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Replies:
Posted By: steve(ill)
Date Posted: 27 Feb 2021 at 9:47pm
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look under the hood on each side.... behind the crank shaft pulley... see if you can see the leakage there, and dripping down... I would "assume" this is leaking around the crank shaft seal.... could be lower around the front cover or the oil pan, but seal would be my guess....... See i you can locate where it starts and we can give a better idea of the fix.. If its ABOVE the oil pan, then you will be pulling the hood, front shroud, radiator, so you can see the front of the motor --- seal and front cover. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 27 Feb 2021 at 9:58pm
------------- Like them all, but love the "B"s. |
Posted By: mdm1
Date Posted: 28 Feb 2021 at 9:02am
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If it is the seal make sure you center the cover over the crankshaft BEFORE you install the seal. (I will be redoing one this year) You will probably need a speedi sleeve over the shaft as well. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: steve(ill)
Date Posted: 28 Feb 2021 at 9:17am
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Mike, i always install the seal in the cover, then use THAT to help center the cover as i install...... I agree, if you install the cover, then put the seal in AFTER... YOU BETTER HAVE IT CENTERED REAL GOOD ! Crank has a groove to lube the old leather seal.. Thats how it PUMPS out oil.. your right, a speedi sleeve is needed to cover the crank and eliminate the groove, or it will tear up the new rubber seal. ------------- Like them all, but love the "B"s. |