Honda-SOHC

SOHC.co.uk Forums => CB350/400 => Topic started by: royhall on May 28, 2015, 06:28:29 AM

Title: Crancase joints.
Post by: royhall on May 28, 2015, 06:28:29 AM

Easy question this morning guys. Whats the recommended jointing goo for the join on the crankcase halves. I've got some Blue Hylomar is that okay, but will get whatever is advised. Thanks.

Title: Re: Crancase joints.
Post by: Bryanj on May 28, 2015, 06:34:46 AM

Hylomar is OK as long as it is spread VERY THINLY as is silicone used the same way. Some people swear by threebond or Yamabond but they are pricey for only one engine.

I have always used silicone and never had a problem but then i have been doing it years and know how much is too much----remember what you see squeezed outside is the same as what squeezes inside

Title: Re: Crancase joints.
Post by: royhall on May 28, 2015, 06:46:43 AM

Is that just the clear bathroom silicone your using Bryan. Got heaps of that.

Title: Re: Crancase joints.
Post by: mike the bike on May 28, 2015, 07:07:58 AM

I use. Grantille instant gasket.   It's clear and doesn't show.

Title: Re: Crancase joints.
Post by: royhall on May 28, 2015, 08:16:29 AM

I assume you meant "Granville instant gasket clear" Mike. Got some ordered off eBay. Only £5.95 for 85g tube. Cant be bad.

Can I just clarify something else without having to start a new thread. Bit of a dumb question that I should have tried out before pulling the engine. On the 350/400 is it possible to remove the head and barrels with the engine in the frame?

Thanks Guys.

Title: Re: Crancase joints.
Post by: tom400f on May 28, 2015, 08:20:56 AM

Roy

Yes you can do a top-end strip of a 400 without removing the engine  :)

Title: Re: Crancase joints.
Post by: Trigger on May 28, 2015, 10:22:30 AM

I use Hondabond but, it is basically all the same stuff. For a fin layer spread with a old credit card so the surface is just a little tacky to touch. 

Title: Re: Crancase joints.
Post by: Bryanj on May 28, 2015, 03:36:25 PM

Another thing I was told years ago on a course somewhere is that when you do the crankcases you should put the  same amount on the pillars that the main bearing bolts go through even though they are inside the engine to get an even clamping force, sort of made sense to me at the time so always do it. Trick with credit card is good idea alsp i always put the smalest bead possible on the outside bit of the joint surface and a very small bit arround any bolt holes to stop oil apearing under bolt/screw heads.

Hope that helps mate and best of luck