C15 Sealant

[Marshall]

Good evening.

I'm sure that someone on here with a lot more knowledge than me will be able to help.
I'm reassembling my 1961 C15 and have finally twigged that there are no paper gaskets on the timing side inner and outer covers. I was tempted to make some but thought it prudent to ask for advice. I'd be interested to know which sealants work best from the people who know best? 

[AdrianS]

I've always used Threebond. A bit pricey and a bit of a swine to clean up but works very well !
You can use cellulose thinners to clean it off. I use it to seal 2 stroke crank cases and it works very well there.

[chaz]

When I used to go to Fluff Brown for AJS Stormer parts he used bathroom sealer on the starmaker engines.  There is a blue  fuel and oil resistant sealer I use as well but pricey.

[Bees]

Wellseal is my preferred sealant. It doesnt dry like silicone but stays tacky.

[Csx355]

When I rebuilt my 1977 K@w@s@ki Z1000a1 motor the recommended sealant was a product called Michel - I bought mine here https://www.motorcycleproducts.co.uk/instant-gasket-maker-clutch-cover-gasket-p-243254.html
It's grey silver in colour and horrible to use in as much that it will not stick to anything that is not scrupulously clean. I tend to dab / pat it on the case surfaces, not smear it, leaving little peaks of sealant. This makes sure that it does not spread out onto the inside of the motor. In fact doing this you can barely see it on the outside. Given that the cases are not butchered it seals very well and separates nicely. I have built both my B44's now with it and they are fundamentally leak free apart from the an occasional drip from the dozy chain oiler outlet at the back of the primary case.

[DON GRAY]

Hello!

I'm another fan of Threebond using it on my B44 crankcases with success. Like anything gloopy....Messy to use if you're not careful!  Clean up with Cellulose thinners.

[chaz]

seconded regarding Welseal and Michel.
rebuilt the engines of my old Viva HB and Hunter GL both using Welseal as its what Vauxhall used at the time.  used it recently and forgot how messy it was, brown fingers , sticks to everything BUT did the job. As for Michel, yes I get it from trade suppliers and always have a job getting it to stick. usually brush on but end up with the brush pulling it into blobs. Apparently its used by the Japanese manufacturers.