29-03-2020, 08:56 PM
I would try with a silicon gasket first, without filling the voids.
Make good all the threads in the crankcase so you know you can tighten them all properly.
Leave it on the bench with oil covering the joint, and see what happens.
Plastic metal works well if you really want to fill the voids.
The gasket does the work, though. It is fairly easy to get a half decent finish on the 'case - though I wouldn't spend very long on it.
The design of the standard sump, though, means that they will never be truly flat, once you tighten them down.
Try it as it is, with a decent gasket.
Make good all the threads in the crankcase so you know you can tighten them all properly.
Leave it on the bench with oil covering the joint, and see what happens.
Plastic metal works well if you really want to fill the voids.
The gasket does the work, though. It is fairly easy to get a half decent finish on the 'case - though I wouldn't spend very long on it.
The design of the standard sump, though, means that they will never be truly flat, once you tighten them down.
Try it as it is, with a decent gasket.