blow head gasket in oil passages'

dave305 · Post by **dave305** » Mon Aug 19, 2013 11:49 am

66 305 scrambler,
I replaced the crank had a cb k5 to a cb k40 the latest model with the different spline -020 part drive sprocket. On start up I blew the head gasket oil passages with rubber O rings. Blew out from the oil pressure. I really can't think of anything I did [never had the head apart] and checked everything and all seems good. Only thing I put some case sealer 1211 around the gasket oil holes when I put it together and after I took it apart it seems like all I did was make it so slippery the head gasket never gripped the motor. Dose anyone have any other ideas?

Thank You for the help.

kirbb9 · Post by **kirbb9** » Thu Aug 22, 2013 12:01 am

You shouldn't use any sealer on the head gasket. And with new o-rings you do
not want to put sealer on them. Also remember that these parts fit tight and
any excess sealer will be squeezed into the engine cavity. It will hopefully stay
there and not cause problems but you never know.

A very thin bit of sealer on engine cases with no gasket if about the only place
any sealer is needed.

Brady

dave305 · Post by **dave305** » Sun Aug 25, 2013 6:25 pm

Cleaned everything up and put it all back together with new gaskets and no oil leaks.

kirbb9 · Post by **kirbb9** » Mon Aug 26, 2013 11:44 pm

Good deal!! Go wear it out!