If you look closely at the timeset install you will see that it is
recessed a bit in the case.  This reduces the amount of sealing surface
that the copper crush washer has to seal against.  Did you torque the oil
plug to spec?  If you do it should deform the copper crush washer enought
to make a good seal.  If that does not work, some people use a
nylon/plastic oil plug sealing washer available from a FLAPS instead of
the copper sealing washers with good success.

Pascal
'84Westy

On Thu, 19 Mar 2009 18:54:15 -0300, Allan Streib <streib@cs.indiana.edu>
wrote:

> After repairing my oil drain threads with a Time-Sert, and installing a
> new drain plug and washer tightened to spec, I am still having a slow
> oil leak.  Probably a couple of drops a day, give or take.
>
> Has anyone used a paper gasket under the washer, or addressed this in
> any other way?  Or could the leak possibly be coming from the case seam
> itself?
>
> Allan
> --
> 1991 Vanagon GL