Water Pump: Service and Repair

Removing and Installing/Replacing Water Pump





Release water pump belt pulley.
Remove alternator drive belt.
Remove pulley from water pump.
Remove coolant thermostat.






E46 Only

Note:
Pipe (1) is also screwed on exhaust side to cylinder head.
Release screws and remove pipe (1).

Installation:
Replace O-ring on pipe (1).





Water pump is secured with 5 screws to engine block.

Z3 M Version:
Also release screw at position (1).
Release screws and remove water pump.





Installation:
Check dowel pins (1) for damage and correct installation position.
Keep sealing faces clean and free of oil.
Replace seal (2).





Installation:
Replace sealing ring on pipe (1).

Caution: O-ring on pipe (1) can very easily be torn off when water pump is fitted.

Coat sealing ring with water acting as antiseize agent and carefully fit water pump.