Which kind, there are two: one with a 30mm hub, one with a 36mm hub
(distance between holes, center to center).

You have to use a water pump specifically for each pulley.

The 30mm pulley sheave diameter is 115mm.

The 36mm pulley sheave diamteter is 140mm.

The double-belt, double-pulley setup that came stock on most or all
diesel vanagons, that uses the shimmed sheave adjustment, has a rear
pulley or 140, which is belted to the alternator (and uses the
alternator for tensioning) and a front pulley of 115mm, using the shims
and is belted to the outer sheave of the crankshaft pulley.

More often that not, owners have dispensed with the two-belt system and
run a single belt over the crank pulley, water pump pulley and
alternator pulley. I have found this to be more convenient but less
functional than the stock setup.

Jim

On Jul 3, 2005, at 9:59 PM, Alistair Bell wrote:

> Does anyone know the diameter of the stock NA diesel water pump pulley?
> thanks,
>
> Alistair
>
>
> '82 westy, diesel converted to gas in '94
> http://www.members.shaw.ca/albell/
>