TOPIC:

Hello, I have just purchased a 1990 Saturno 500, upon removing the timing cover I have found coolant leaking from the water pump. Does anyone have info on rebuilding the water pump or a source for a replacement pump.I am in Portland Oregon.
Cheers,
Mike

They can be refurbished. See:

Saturno coolant pump video

Be careful when removing the pump from the engine. It's easy to break the mounting flanges so don't lever on them. Using a soft mallet work around the pulley tapping it to ease the pump out of the cylinder. This can take a bit of time so go slowly.

This is what my pump looked like after I pulled it apart:



The parts needed to rebuild the pump are:

2 x Water Pump Bearings: 6001 2RS / C3
1 x Water Pump Seal: Burgmann BT-AR 12C

The tech details for the seal are:
Seal Specs.

If the shaft is damaged you may need to have a new one made. My original pump shaft looked like this:



Any competent mechanical engineer should be able to make up a new shaft for you using the pump as a guide. Be careful though. The first pump shaft I had made didn't have the correct interference fit for the pulley and it came off. Fortunately the cam belt cover stopped it coming right off and no serious engine damage occurred (apart from the cover).

My rebuilt pump is now running perfectly on the second attempt:



Joachim measured up a number of old pump shafts and came up with this table which may be helpful:

we now have 2 threats on this, so that may lead to confusion
I still have some oft he replica shafts a member of the german forum has got made last year

ciao Joachim

Thank you Joachim,
I will know more as soon as I disassemble the pump.
Cheers,
Mike