Reply to "ZF threaded studs questions"

Wilkinson explained to me that the rear cover on the ZF leaks from about half of the 16 studs.  The reason is that half of the studs are very long and extend all the way through to the main case.  The spring washer and 8mm nut do not provide a correct seal.  He suggested to take the nuts off one at a time (you can actually do several), clean the stud and surrounding area with acetone or brake cleaner, apply a small amount of black silicon, and reassemble and wipe off excess silicone.  I have done on three ZF's and the rear cover does not leak.  This fix costs nothing if you already have a tube of black silicone.