C Rear Main Seal
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=120661
Printed Date: 21 Sep 2025 at 2:57pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: C Rear Main Seal
Posted By: Jhebel
Subject: C Rear Main Seal
Date Posted: 20 Mar 2016 at 6:55am
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I have a C that I am restoring, and the rear main seal drips a little bit. This tractor runs OK, and I am tearing the motor apart anyway. Is it worth taking off the crank shaft to replace the rear main seal, or is it alright if it drips a little bit?
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Replies:
Posted By: Hubnut
Date Posted: 20 Mar 2016 at 7:13am
The rear main on a C does not require the crank to be pulled. On the back of the motor, a housing holds the seal (either felt or cork). I've used both and both seep a bit even new. If you're pulling the motor, you might as well change the seal. The seal is soaked overnight in motor oil, slipped into the housing, and then pressed over the rear crank shaft. Not a hard job at all. Good luck!
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1940 B "Lucy"
1941 B w/ Woods L59 "Flavia"
1942 B w/ finish mower "Dick"
1941 C w/ 3-point "Maggie"
1947 C SFW w/ L306 "Trixie"
1972 314H
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Posted By: PaulB
Date Posted: 20 Mar 2016 at 7:28am
As mentioned the original type seal can be replace without dis-assembling the engine. Those type seals are designed to work with the spiral on the back of the crank to pull the oil back into the engine. These seals will almost always have a slight dampness around them, some more than others. I have updated many of the BE/CE engines to use the lip type seal from a D10/12 by installing a Speedi-Sleeve over the grooves and the D10/12 seal housing.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Posted By: Jhebel
Date Posted: 20 Mar 2016 at 10:15am
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Is the Steiner gasket kit with the rear main seal in it good to use?
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Posted By: Jhebel
Date Posted: 20 Mar 2016 at 7:03pm
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I also just remembered another unrelated question that you guys might be able to answer. The tractor has a device on the front of the radiator that does not seem very common on C's. It has flaps that can open and close with a crank that sticks out the side of the radiator shroud. I would assume that this is for wintertime operation because it restricts the airflow through the radiator. Is this uncommon?
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Posted By: Dick L
Date Posted: 20 Mar 2016 at 8:01pm
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Shutters were very common when those tractors were made.
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