SOHC.co.uk Forums > CB750

CB750 Crankcase jointing compound

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mick:
I thought I had put a very thin coating of sealant on when I rebuilt my engine and was surprised how much oozes out both inside and out when the cases are clamped shut  :o, so what ever you decide to use,  use it sparingly  ;) cheers Mick.

Bitsa (Ralph Wright - RIP):
Hi Guys,
I have  been too lean on occasions especially around the extreme outer edges and only to find oil coming down from the crankcase bolts.
Cheers
Bitsa

LesterPiglet:
I'm afaid I have something against silicone compounds. Too easy to apply too much. At least Hermatite does not solidify.

fisjon:
Click the link below to see a photo of a CB650Z motor with Blue hylomar on the joints that I built up two years ago.
I put it on with a plastic shringe, placing a tiny bead on the outer edges of the casing, but as you see even a thin bead is probably too much. I looked inside the engine with a torch and could see a few small blobs and removed them, problem is you cant see inside the gearbox once it is sealed so it was crossed fingers after that. As far as I know the motor is still purring.

I think the cases are so well machined that just an even smudge will be enough to form a seal.

http://www.sohc.co.uk/index.php?topic=4964.msg25045#msg25045

philward:
Thanks for all your replies - seems the key thing whatever I use is using sparingly particularly around oilways - but covering the whole surface.  Sent for some blue hylamar last night after first few posts as need it for time off between Christmas. Just read a bit about Hondabond and that's silicone based too so I'll have a go with the hylamar. I never worried before but being an old git now has turned me into a worrier! My only concern is how long it takes to go off whilst I'm fitting crankcase together - never had that problem with the red hermatite. Know what you mean about the red hermatite being associated with bodges - seen some of them back in the seventies - particularly on oily British bikes!
Thanks for all your help again guys.
Cant see the pics for the last post - must be my settings
Phil

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