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Which sealants ?
Tweet Topic Started: Nov 1 2015, 05:11 PM (42 Views)
Mikew Nov 1 2015, 05:11 PM Post #1
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I’m trying to work out which gasket and engine sealants work best for different applications I need?

First it is the base gasket area of the crankcase which might need a little help in one area and in the past as I’m using a gasket and not metal to metal contact, I would use Blue Hylomar, is this the best thing to use?

Second, is the usual joining of the crankcases where Threebond seems to be the popular choice which I guess I’m happy with but would I also use it for my base gasket area which has a few marks which the gasket might seal?

Third which is worrying, one of the previous owners has done a good job of messing up the surface of the crank seal area probably with a screwdriver when removing the seal. I’ve never run the engine and feel I’d like to add sealant when inserting the seal. Is this something anyone has done and if so what would you use? I thought of RTV black silicon of whatever it is that withstands heat and petrol although that might get blown out? Maybe the Threebond but as the seal seems pretty tight I don’t know how much would actually stay in after inserting the seal?

It would be good to hear from anyone with any experience of this sort of stuff, cheers Mike

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chasthor Nov 1 2015, 06:57 PM Post #2
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In my experience, and certainly with your first 2 points, Threebond works. I use the product. I have done what you are thinking of doing, and Threebond has not failed me yet.
Now, your third problem.
How bad is the crank seal area? and I am going to guess, that its the one behind the magneto.

Edited by chasthor, Nov 1 2015, 06:57 PM.
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Mikew Nov 2 2015, 08:47 PM Post #3
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I must confess it's actually my AR80 right hand case which unfortunately is the one with the engine number. This close up picture makes it look worse than it is or rather tells the truth of the matter. I doubt you would know either way when the seal is in?
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chasthor Nov 2 2015, 09:18 PM Post #4
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It doesn't look so bad. Ive had worse, but the OD of the seal has always had plenty of rubber on it, to give a snug fit.
If in doubt, you could smear some liquid PTFE on the case prior to fitting the seal.

Just a thought.
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