SOHC.co.uk Forums > CB750

Oil leak

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Andy1976:
1st time I noticed it the light wasn't that good so I didn't see the covers leaking. ::)
Some of the guys on the US site said not to worry too much about the smoke, it'll settle down after I've put some miles on her.
Phew!! panic over.

Cheers
Andy

Andy1976:
It's still leaking!!!!!!!!!!  >:(
The tappet cover seals have been replaced and four bolt holes have been heli coiled as the rocker cover was also leaking.New rocker gasket. It looks as if it's leaking between 1+2.The head gasket seems fine. I was on the phone to a guy in Wetherby this morning and he said it may be the round disc under the cam carriers that may be causing it.
These round discs were replaced with new ones when I rebuilt the top end.

Any Ideas on this.  (This bike will not get the better of Me)  ???

Andy

Bryanj:
Oil can leak arround those "pucks" if you didnt use a sealant on them.

Also the stud/bolt holes on  the cam bearings are through holes and if not in excellant order can leak oil down the threads.

But first have you checked the tacho cable seal

Andy1976:
Hi Brian,
The tacho cable seems OK.
Thinking back to when I rebuilt the top end, I'm pretty sure I didn't use any sealant on the pucks so I'm guessing it's this that causing it to leak.
When I've got it stripped down (again  ::) ) I'll also check the bolt hole threads.
What sealant would you recommend?

Thanks again
Andy

Bryanj:
Personally I would use Silicone VERY sparingly, but then i have been doing it for years and know where not to get the goo so it doesnt block anything, The guys on the US site have lots of different ideas on the subject, would be worth looking at mike reike (i think thats spelt wrrong) posts

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