11 51 000 Removing and Installing/Replacing Coolant Pump

11 51 000 Removing and installing/replacing coolant pump (N51)







WARNING:
Risk of scalding.
Only perform these tasks on an engine that has cooled down.







Recycling:
Catch and dispose of drained coolant. Observe country-specific waste disposal regulations.







IMPORTANT:
Aluminium magnesium materials.
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.
Aluminium screws/bolts are permitted with and without colour coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).
If a coolant 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:
- Drain coolant.
- Remove coolant thermostat.

Disconnect coolant hose (1).
Disconnect plug connection (4).
Release screws (5).

Installation note:
Replace aluminium screws.
Tightening torque: 11 51 1AZ.







Installation note:
If the coolant pump is to be reused, it must be mechanically rotated once (breakaway torque at impellers).
One coolant pump rotation will be sufficient.







Assemble engine.
Bleeding instructions must be observed without fail.