Help with oil leak

[davomoto]

I have a 64 305 CB77. I have replaced the right side crank bearing seal with a new one, the one I replaced looked new as well, but I still have an oil leak here. The back of the starting sprocket bushing area looks nice and smooth. Here's a couple pics of oil leak. Any suggestions? The seal is installed flush with outer case.

Thanks, Davomoto

[LOUD MOUSE]

How is the surface of the starter sprocket.
Ruff? Grooved? ..................lm

I have a 64 305 CB77. I have replaced the right side crank bearing seal with a new one, the one I replaced looked new as well, but I still have an oil leak here. The back of the starting sprocket bushing area looks nice and smooth. Here's a couple pics of oil leak. Any suggestions? The seal is installed flush with outer case.

Thanks, Davomoto

[davomoto]

Thanks for the reply! Nice and smooth. I do notice that it is rather shallow, as in not a lot of surface are in seal.

davomoto

[LOUD MOUSE]

Be sure it goes all the way up the tapered shaft with the rotor. .............lm

Thanks for the reply! Nice and smooth. I do notice that it is rather shallow, as in not a lot of surface are in seal.

davomoto

[davomoto]

yes it goes all the way in, and the fixing plate bolts on flush. i just used my last new seal on a complete rebuild that's sitting on my bench. i will order more seals soon.

[davomoto]

So, I installed another new seal, but this time I coated the outside of the seal with three bond 1104, the same sealer I use for crank cases, and installed it flush with crank case. Problem solved. One note, the seal I installed was a 6.5, instead of the standard 7.5 width. it was what I had, and it worked. Thanks for the input.

Davomoto

[deaddog]

Where did you buy your seal? How much did you pay for it? I have the same leak and am ready to purchase a seal.