VB head gasket

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bevanclark
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VB head gasket

Postby bevanclark » Thu May 09, 2019 12:09 am

Hi folks,
When replacing the gasket should it be fitted dry, oiled...or what ?
Thanks, Bevan

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Re: VB head gasket

Postby nevhunter » Thu May 09, 2019 2:08 am

I do the "what"?. High temp aluminum paint to both sides and let dry for about an hour and retension after it's been hot in use. Nev

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Eero.Korhonen
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Re: VB head gasket

Postby Eero.Korhonen » Thu May 09, 2019 5:23 am

If you are using copper gasket (again old one maybe), you should heat it to red and let it cool.
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bevanclark
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Re: VB head gasket

Postby bevanclark » Thu May 09, 2019 6:46 am

Thanks, Eero and Nev.
Nev: why Aluminum paint ? I'm always keen to learn, but this was a rather unexpected answer. Having Googled it, I find it is recommended for storage tanks, roofs and pipework. it does say it is highly resistant to corrosion, but how does it help sealing the head ?
Cheers, Bevan

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Re: VB head gasket

Postby john.whiting » Thu May 09, 2019 10:04 am

Aluminium paint is an old standby for head gaskets.......especially if you are reusing one. Tried and tested ......a common brand was "silvafrost"......useful for touching up rusty exhausts,too.

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Re: VB head gasket

Postby Simon.Gardiner » Thu May 09, 2019 1:23 pm

As paint specs seem to be ever-changing, does that trick also work with modern paint?

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Re: VB head gasket

Postby Mike Nash » Wed May 15, 2019 8:05 pm

Does anyone know of a source of solid copper VB head gaskets? They seem to be favoured over the composite type for other sidevalves, for instance for BSA M20s on the wartime DR bike site. Regards, MikeN.

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dave.owen
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Re: VB head gasket

Postby dave.owen » Wed May 15, 2019 8:22 pm

I'm sure drags do them, you'll have to ask as I don't think they listed on the website.

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bevanclark
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Re: VB head gasket

Postby bevanclark » Wed May 15, 2019 8:29 pm

I bought a decarb kit from Single spares - it has a solid copper head gasket.
Cheers, Bevan
VB Gaskets.jpg

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Re: VB head gasket

Postby john.whiting » Wed May 15, 2019 8:55 pm

Might be extreme,but I found common black silastic was a good head gasket sealant......it withstands high temp.............when I was working ,I kept a fleet of forklifts going using silastic on the heads which were seriously corroded and burnt from gasket leaks.Surprisingly ,the silastic stayed rubbery even inside the combustion chambers......the engines were 6 cyl SV Continentals running on gas........replacing head gaskets went from once a month to years.......in fact the next problem was rusted head bolts ,from not being removed for long periods.


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