SOHC.co.uk Forums > CB750

Crankshaft seal behind points

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bluemouse1006:
Hi
I've fitted a new crank seal behind the points plate o my cb750 SOHC when I rebuilt my bike a short while ago . From what I remember it was a right pain to fit ( it's the original from dave Silver) the edges where serrated and it didn't go in that well , anyone had the same problem ? Is there another seal available somewhere else ?
Thanks again
Look forward to hearing your comments

Amos

hairygit:
I assume you fitted the seal BEFORE joining the top and bottom casings? Trying to fit that seal with the cases assembled is 99.9% likely to fail :'( If done properly with the cases apart, the seal sits in a groove machined in the casings ;D

bluemouse1006:
Whoops
Thought it would be something like that .
Any way this can be sorted without splitting the cases again ..

Amos  :)

hairygit:
The only way to guarantee a leak free seal is to split the cases I'm afraid :( It probably can be done with the engine complete, but will almost certainly start leaking again :'( DO NOT be tempted to use sealant for a quick bodge, too much risk of it getting inside the motor, often with horrendous consequences :o

bluemouse1006:
Hairy
Thanks for that , really don't want to split the casing again will be taking out the seal today and having a look .
The leak is getting oil all over the foot peg now so will have to sort it.

I'll keep you updated

Amos (Bluemouse 1006)

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