[Vwdiesel] Pump leak from bottom?

[MWoodland at Dentsply.com]

91 NA w/281k...
The pump was tight when I bought the car (275k) , and I've been adding
Power Service for the first few thou. then when I got things cleaned up
(and the full load enrichment screw adjusted correctly), I started adding a
few oz.of MMO with each tank.

Since adjusting the full load, the idle dropped, and I have been
compensating by pulling on the cold start advance.. and leaving it on till
I get the time to mess with setting up the pump correctly (and learning how
to do it correctly)

The pump had started leaking slightly from the rear, and from reading the
archives, I assumed that it was probably from the cold start advance
mechanism.
It wasn't bad, and would leave 1-2 drops when I parked it.

This weekend, I had just added a pound of dissolved paraffin wax... Hagars
wax test.. and before it even hit the pump the pump was leaking heavily
from the rear ( block side). Visibility was very limited, but with my best
flashlight, it appeared that the pump was leaking from an area behind the
cold start lever, from a circular boss cast into the bottom rear of the
pump, right next to the pump head interface.

Does anyone know if there is a plug / screw,, O-ring sealed 'something'  on
the bottom that could be leaking?..
and could be replaced / tightened from underneath, without removing the
pump?
Since this is the low point between the cold start advance, and the pump
head, I'm starting to think it may also be the pump head 0-ring...

I promptly ran out of time, but as soon as I get home, I'll get the mirror,
and see what's going on underneath.

I have most of the tools, and years of VW / Audi / Benz experience.. but
very little diesel, and even less diesel pump experience.. and would be
pretty intimidated to pull the  pump without the cam locating 'tool', dial
indicator, etc, to set the pump timing back up...

though I do see these things (and more) looming in my future like a train..
Many thanks,
Mark


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