Water Pump: Service and Repair

11 51 000 Removing And Installing/Replacing Coolant Pump (N55)







WARNING:
Risk of scalding.
Only perform this work after engine has cooled down.







IMPORTANT:
If a coolant pump that has already been operated is reused, it must be filled with coolant after removal.
Mixture ratio, water: coolant =1:1
Protect plug connections against coolant and contamination.







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







Necessary preliminary tasks:
- Follow diagnosis instructions.
- Remove engine guard.
- Remove charge air cooler.
- Drain coolant.
- Remove thermostat.
- Remove reinforcement plate (only E70, E71, E84).







Disconnect plug connection (1).
Release coolant hose (2).

Installation note:
Note installation hose clamps.

Tightening torque 11 53 9AZ.







Release coolant hose (1).

Installation note:
Note installation hose clamps.
Tightening torque 11 53 5AZ.







Follow assembly instructions:

Installation note:
Hose clamps (1) must be installed in the centre of the marked area (see graphic).







Release screws (1).
Tightening torque 11 51 2AZ.

Installation note:
Replace aluminium screws.







Unclip cable (1) from bracket.
Release screw (2).
Tightening torque 11 51 2AZ.







Installation note:
If the electric coolant pump is reused, it must be rotated one turn due to the breakaway torque at the impellers.

Assemble engine.
Bleeding instructions must be observed without fail.