1.Tobybul's pictorial and tutorial on the Older Style:
http://www.peachparts.com/shopforum/diesel-discussion/170839-fixed-auxiliary-water-pump.html
Is excellent.
Note: no metal "Crimps" to hold the motor housing onto the Pump.
('Uses Long bolts Through the Motor to the Pump...Like a Bosch Diesel Starter)
He does not separate the upper and lower halves of the pump housing,so that's
a mystery.
2.Bosch (OEM type) 0 392 020 026 purchased from the AA(Verboten) online
retailer in 2002.[Manufacture date of 2000]
NOTE: This is an Induction type Electric Motor,no direct connection between
the Motor and the Impeller of the Pump.
AND the Motor Housing uses Crimps to secure the Motor to the Pump Drive Housing.
AND the Pump Housing Halves are secured by 4 and not Three screws.
PICTURES BELOW
3.The type on the post facelift '95 e320 which is also an Induction type drive
BUT the Upper Pump housing is part of the Mono-valve assembly.
[I can't tell from all the Online pictures if this unit uses 3 or 4 screws to
secure the Induction Motor/Impeller assembly to the Upper Pump/Mono-Valve
assembly.]
If it does use Three instead of 4 screws,it will be necessary to Un-Crimp the
Induction Motor assembly from the Impeller Housing of the Bosch OEM unit
and Re-Crimp it to the O.E. type