The water pump, in this photo located between fan and front part of the engine, will be restored completely. The cooling capacity of these cars is not very over engineered so to keep the engine cool the water pomp need to be in top condition.

My first idea was to reuse the impeller, originally they have 4 blades, but removing them is a difficult job. Because the impeller is made of cast-iron and pressed unto the bearing axle it is almost impossible to remove them with breaking. Secondly I could not find the correct water sealing ring.

So I decided to buy a water pomp repair kit (SBS7272) with:

• 6 blade impeller (they have a smaller inside diameter)
• Bearing (one side has a smaller axle to receive the impeller)
• Water sealing ring
• Gasket
  

  Parts needed to rebuild the water pump

After the impeller and carrier for the pulley are pressed onto the bearing axle the water pump can be mounted onto the front side of the engine.

Rebuild water pomp mounted to the front side of the engine