B Valve cover gasket
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=58291
Printed Date: 27 Jul 2025 at 9:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B Valve cover gasket
Posted By: Ted in NE-OH
Subject: B Valve cover gasket
Date Posted: 14 Oct 2012 at 8:37pm
For years I've had trouble with the valve cover gasket leaking on a B right behind the under hood muffler. It seems the heat softens the gasket cement and then the gasket bows in and leaks. I've tried to fix it a couple of times and same thing. Any tricks?
------------- CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914 |
Replies:
Posted By: mweiland
Date Posted: 14 Oct 2012 at 10:00pm
| i do not know if its factory spec., or not , but i wipe down the gasket as dry as possible as well as the valve assemble and install with no sealant. i haven't ever had a problem. maybe a new gasket is in order..... perhaps a cleaner surface....just a thought |
Posted By: Ted in NE-OH
Date Posted: 15 Oct 2012 at 11:25am
|
Bump
------------- CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914 |
Posted By: Dick L
Date Posted: 15 Oct 2012 at 4:06pm
| Number one is (NO PAINT) under the gaskets. Valve cover gaskets do work well dry but I stick/glue them fast to the cover and never use anything on the head side. Seems if I don't glue them to the covers on Allis Chalmers that they bow in and leak. Some makes have metal tabs that hold the gasket in place on the covers. When a cover has the tabs I don't use anything on the gasket. Tightening them to tight will cave down the center to where the cover is not as tight on the head as you thought also can be a problem. |
Posted By: Ted in NE-OH
Date Posted: 15 Oct 2012 at 4:43pm
Thanks guys I'll try that.
------------- CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914 |
Posted By: j.w.freck
Date Posted: 15 Oct 2012 at 7:45pm
| why not add an aluminum heat shield between the exhaust and the rocker box.that should do it..... |
Posted By: George Davenport
Date Posted: 15 Oct 2012 at 7:51pm
|
I had trouble with my B which had cork gaskets that would break down repeatedly due to heat. I finally replaced it with a neoprene gasket by FelPro. Part number was VS 3708 R. The gromlet bolt seals were included with gasket. (Also called rocker arm cover gasket). I think that would cure your problem.
------------- Life is what happens while you are making plans for the future |
Posted By: Steve in NJ
Date Posted: 16 Oct 2012 at 7:08am
|
I've always used 3M weatherstrip adhesive on the valve cover side to keep the gasket where it belongs. Wait over night for it to cure, and install the cover on a nice clean valve cover rail. I use Brakekleen on a rag to clean any oil off the valve cover rail before I install the cover w/new gasket. That process I use on all engines. Tractor, car or truck. Seems to work fine. I only had two failures all the years I've been doing it that way, and it turned out in both instances that the valve cover was whooped, and the gasket couldn't sit flush to seal correctly...
mailto:Steve@B&B" rel="nofollow - Steve@B&B
|
Posted By: SteveC(NS)
Date Posted: 16 Oct 2012 at 6:19pm
| I always try to "dress" the bolt holes in the valve cover back a bit, they can get a bit tired after a while. |
Posted By: dkalsow
Date Posted: 13 Feb 2019 at 1:40pm
| I have to replace mine as well. Does anyone know the torque for the bolts on the valve cover? Thanks |
Posted By: Dick L
Date Posted: 13 Feb 2019 at 3:46pm
| Never torque the valve cover bolts! If you tighten to much and bend the hole down you will never stop the cover from leaking until you bend them back up. When you see the metal around the hole bend down slightly you have the maximum torque needed. |
Posted By: dkalsow
Date Posted: 13 Feb 2019 at 8:51pm
| Sounds good - thanks |
Posted By: CTuckerNWIL
Date Posted: 14 Feb 2019 at 9:06am
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Use a good straight edge on the valve cover to make sure it's flat before you put it back together. Many have been torqued and aren't flat. A small hammer and a flat solid surface come in real handy for making it flat again. ------------- 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: dkalsow
Date Posted: 14 Feb 2019 at 10:02am
|
Good to know - thanks |
Posted By: Bill Long
Date Posted: 14 Feb 2019 at 10:39am
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Back in the day we used to seal the gasket to the cover first before installing it. If we did not we had an immediate leak. Used tools to hold in place till cement took well. Be certain it is well cleaned before installing. Usually did not have a problem. Listen closely to what is said above. It is great expert advice. Take good care of my favorite. Bill Long |