Case Assembly Sealer

P.Martinez · Post by **P.Martinez** » Tue Dec 31, 2013 10:33 am

Getting ready to assemble the upper & lower engine cases and would like to have some recommendations from those knowledgeable engine assemblers out there as to what I should use for the sealer between the cases (engine is a 305). Silver's book says "Three Bond", but does not say which Three Bond product, there are several. I have also read that "Hondabond 4" or "Hondabond HT" can be used. My preference would be Permatex 27B Hi-Temp RTV, as I already have an unopened tube. All of these sealants appear to be silicone-based, and I realize that whatever is used is done so sparingly. Thanks for any suggestions.
Phil M.

Hahnda · Post by **Hahnda** » Tue Dec 31, 2013 1:58 pm

I use yamabond 4 which is the same as hondabond 4.

P.Martinez · Post by **P.Martinez** » Tue Dec 31, 2013 3:12 pm

Thanks Kevin. Will get a tube of the Hondabond 4 product.
Phil

Hahnda · Post by **Hahnda** » Tue Dec 31, 2013 3:19 pm

I'm not saying that the Permatex 27B Hi-Temp RTV wouldn't work but I guess I don't know it well enough to say if its the same or similar.

malcolmgb · Post by **malcolmgb** » Tue Dec 31, 2013 4:59 pm

I've always been a fan of Hylomar Blue, it was a product used by Rolls-Royce, not sure if it is available in the US.

hondadreamca77 · Post by **hondadreamca77** » Wed Jan 01, 2014 12:06 pm

I've used Permatex gasket seal for over 35 years on air cooled rebuilds and never once had a failure....

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