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John Deere Tractors Discussion Forum
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JD B headgasket

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ARS

08-06-2006 14:20:12




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why do they tell you to soak the gasket in oil for 5 seconds? is it to expand the gasket material fot a better seal? does everyone do it? is it important?




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johns48b

08-06-2006 20:09:04




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 Re: JD B headgasket in reply to ARS, 08-06-2006 14:20:12  
when i had my head put on by a jd mechanic of 55 years, he wanted to know if i had any of the real old thick axle grease. i happened to have some and he put a good coating of it on the gasket before he put in on. that was in 99 and i've not had any problems with it at all. i would think that some of the above mentioned sealers would be ok. i don't think i would put one up without something on it just in case there is a scratch that you didn't notice.

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Duane Larson

08-06-2006 18:55:24




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 Re: JD B headgasket in reply to ARS, 08-06-2006 14:20:12  
ARS,
A November 1945 Service Bulletin from Kansas City sheds some light on this problem. Seems they had some new tractors with a few hours which had loose cylinder head nuts. The problem was identified as cooling water attacking the asbestos core of the gasket, softening the core and resulting in loose nuts. At that time the factory started soaking head gaskets in oil before installing, and they felt that was the best way of treating the gasket for installation. "Under no circumstances should shellac be used".

They went on to say that it is satisfactory to soak the gasket in water, providing the serviceman is very careful that just the right amount of water be used in order that the binder in the asbestos mixture would not be affected - if it is soaked too long the binder and asbestos filler will break down and the gasket will not hold.

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Glen in TX

08-06-2006 18:42:06




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 Re: JD B headgasket in reply to ARS, 08-06-2006 14:20:12  
Some people still soak them like that I guess and get by fine. Most of us do not now as that was really instructions for the old style gaskets. I've used several coats of aluminum paint on them installing with paint still wet or copper coat or permatex aviation sealer or permatex high tack and they all worked well. Most important is having a true flat surface on the head and block and tightening bolts evenly in some kind of circular various pattern.

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ARS

08-06-2006 19:44:14




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 Re: JD B headgasket in reply to Glen in TX, 08-06-2006 18:42:06  
yeah... i wouldnt think that it would affect the new gaskets, because i doubt they are still are made of asbestos



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Glen in TX

08-07-2006 07:05:25




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 Re: JD B headgasket in reply to ARS, 08-06-2006 19:44:14  
Just seems like either instructions in a newer gasket set for a multiple cylinder engine once told me to not soak gaskets in oil or another mechanic told me that? Instructions to soak head gaskets in oil goes all the way back to JD D & GP Instruction manuals and D & GP service manual SMF116 also. When we first started restoring JDs in late 70s all you could get were NOS gasket sets then and many even from JD came with old bad head gaskets that were falling apart and not stored properly so had to find another head gasket. We had bad luck soaking one of those and just didn't try it again. Many gaskets were installed with just grease years ago and you will see that recommended in some JD manuals also but I've never seen it for JD head gaskets but have heard of others having luck with that. Some of the newer Felpro automotive gaskets already have sealers on them but I've never been fond of using those and only if that's all I can find. We have even sprayed those with the aluminum paint before installing on a irrigation engine out in the field all though Felpro said not to put anything on them. We didn't have any leaks though.

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