11 51 000 Removing and installing/replacing water pump (N52)
Only perform these tasks on an engine that has cooled down.
Recycling:
Catch and dispose of drained coolant.
Observe country-specific waste-disposal regulations.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage ).
If a water pump which has already been operated is reused, it must be filled immediately after being removed with coolant (mixture ratio 1:1 / water : coolant).
Necessary preliminary tasks:
- Remove Coolant Thermostat.
Disconnect water hose (1).
Disconnect plug connection (4).
Release screws (5).
Installation:
Replace aluminium screws.
For tightening torque refer to 11 51 1AZ in 11 51 WATER PUMP AND DRIVE (N52) .
Installation:
If the water pump is to be reused, it must be mechanically rotated once (breakaway torque at impellers).
One water pump rotation will be sufficient.
Assemble engine.
Venting Instructions must be observed without fail.