Water Pump: Service and Repair

11 51 000 Removing and installing/replacing coolant pump (N54)





Warning!
Risk of scalding!
Only perform this work after engine has cooled down.





Recycling:
Catch and dispose of drained coolant in a suitable container.

Observe country-specific waste disposal regulations.





Important!
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 work:
^ Drain coolant.





Release screw (1).

Tightening torque 11 51 2AZ.





Important!
Risk of damage!

Coolant emerges when the coolant hoses are detached from the coolant pump.

Cover surrounding components and plug connections with suitable apparatus.

Unfasten hose clamp (4).

Tightening torque 11 51 3AZ.

Detach coolant hose (1) and lay to one side.

Unclip line (5) at position (3).

Disconnect plug connection (2).

Installation note:
Plug connection (2) must snap audibly into place!

Lay line (5) in direction of arrow to one side.





Unfasten hose clamp (2).

Tightening torque 11 51 4AZ.

Detach coolant hose (1) and lay to one side.





Detach clamp (3).

Unfasten screws (2).

Tightening torque 11 51 2AZ.

Remove coolant pump (1) downwards.

Installation note:
If a coolant pump is reused, it must be mechanically rotated once (breakaway torque at pump gears).

One coolant pump rotation will be sufficient.





Assemble engine.

Top up coolant.

Bleeding instructions must be observed without fail.