One of the freeze plugs has a block heater installed.
That one has started leaking coolant. I tried gently tapping
the block heater more firmly into the freeze plug hole, but
that didn't help. (How hard can I tap/hammer before breaking
something?

Somebody please suggest what I should try next! (Preferrably
something which doesn't require me to drain the cooling
system.)

A note in the archives suggests using JB weld to seal the
plugs in an aircooled block. Would that work here also?
JB weld is just an epoxy right? Can I use PC7 instead?
I also thought about silicone rubber, but wasn't sure if 
that would work when the coolant  is under pressure.

If I drain the system, how do I (nondestructively) get the
block heater out? And what should I do to make it seal
better when I put it back in.

Any help would be greatly appreciated. The cold Nov weather
does not invite to exhaustive experimentation in the
driveway.

Thanks,
Martin and 82 diesel westy
--
Martin Jagersand                 email: jag@cs.rochester.edu
Computer Science Department             jag@cs.chalmers.se
University of Rochester          Fax:   (716) 461-2018
Rochester, NY 14627-0226         WWW: http://www.cs.rochester.edu/u/jag/