Silicone 'instant gasket' sealant & Nitro fuel

[PhilPat]

Hi guys,

Am wanting to use an instant gasket type product to seal the backplate on an old OS21 RF-B (& maybe the carb body to crankcase joint too).

The product i've bought states it's a silicone sealant but not suitable for fuel systems. I know that silicone is degraded by petrol but wondered if the methanol/nitro fuels we use also attack silicone? Does anyone have any recommendations of a suitable sealant - I do have some blue hylomar, would this work?

Many thanks in advance

[stoff]

Red/Orange Hermatite (I think that's the brand) name is great for gaskets.

[mark christopher]

never had the need to do it myself, once the back plate is on you will struggle to remove it, just get a new oring seal

[PhilPat]

Thanks for the replies,

it's such an old engine that there's no provision for an o ring seal in the backplate and it just relies on a thin paper gasket which has pretty much disintegrated, so i thought i'd give the sealant a go. I'll have a look for the orange Hermatite stuff and give it a try

Cheers

[mark christopher]

then you need a good rtv silicolne sealant which is oil resistant , most good motor factors will sell it. or if your good with a scalpel http://cgi.ebay.co.uk/5-pieces-Gasket-Paper-approx-9-x3-0-25mm-2-FREE-/180659599054?pt=UK_Motorcycle_Parts&hash=item2a1026b6ce

[PhilPat]

Thanks Mark, much appreciated - i think i have some of that gasket paper left over from making up some gaskets for a pair of DCOE Webers a while back, will give it a go!

[The Chef]

VW use sealant on the later cars sumps. It is about £16 a tube but is defo ok with fuel and oil. Give that a try. You could also try tiger seal from a automotive paint supplier, I've used that on sumps and gearbox's in the past and it is fine. Good lukc.:D