Farm Equipment - valve cover leak ?

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valve cover 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=15492
Printed Date: 04 Feb 2025 at 12:52pm
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Topic: valve cover leak ?

Posted By: john2189
Subject: valve cover leak ?
Date Posted: 20 Jul 2010 at 10:14pm

How common it a cast iron valve cover leak ? I put a new gasket on and it still leaks on the manifold side. or could it be coming from the head gasket ? it soaks the whole side of the engine. Im sure the gasket stayed where its supposed to, I geuss ill have to take it off and silicone it really good.

John

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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub

Replies:

Posted By: CTuckerNWIL
Date Posted: 21 Jul 2010 at 9:19am

Check all surfaces for flatness. Make sure there isn't a chip missing somewhere and be VERY careful using a sealer. It will reak havoc on an engine if it gets in the oil system.

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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: Ted in NE-OH
Date Posted: 21 Jul 2010 at 11:31am

The heat from the manifold softens any gasket cement and the gasket moves. Quite common. I put the gasket on the cover with gasket cement and let it dry a few days before putting it on the engine.

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CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914

Posted By: Brian Jasper co. Ia
Date Posted: 21 Jul 2010 at 11:42am

I agree with heat working on RTV. If it were me, I'd use 3M super weatherstrip adhesive on the gasket to glue it to the cover. Make sure you wash off all traces of oil first with brake cleaner. Nothing sticks to oil...

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: George Davenport
Date Posted: 21 Jul 2010 at 11:57am

What model tractor are you having trouble with? Are you using a cork gasket?

Posted By: john2189
Date Posted: 21 Jul 2010 at 9:05pm

HI, its a B with rubber gasket, it is a new one, i didnt use anything to seal it. I will take it off and use the cement to glue it to the valve cover. Thanks

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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub

Posted By: Bill Long
Date Posted: 21 Jul 2010 at 9:29pm

You know, this is not a new problem. We had valve cover leaks back in the 30's, 40's, 50's and 60's. Very common. We did not have the benefits of all the outstanding gasket cements. We had permetex and shellac - don't laugh.

We used to attach the valve cover upside down in a vice, put on the gasket with a generous supply of shellac, weigh the gasket in place with tools and hammers and let it sit overnight. It even leaked sometimes after that too.

Good Luck!

Bill Long

Posted By: George Davenport
Date Posted: 22 Jul 2010 at 8:47am

I have a B that the valve cover gasket leaked after using several cork gaskets at the manifold area. The cork dries and cracks with the heat. I finally replaced it with a neoprene gasket ( FelPro # VS 3708 R) and used no sealers or cement after cleaning both metal surfaces and have had no problems since. That is what I would suggest.