Water Pump: Service and Repair

11 51 000 Removing and installing/renewing coolant pump (N74)





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

Important!
Risk of damage!
Coolant emerges when the coolant hoses are detached from the coolant thermostat and coolant pump.
Cover surrounding components and plug connections with suitable apparatus





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

Observe country-specific waste disposal regulations.





Necessary preliminary tasks:
^ Drain coolant
^ Remove fan cowl with electric fan.
^ Remove alternator drive belt
^ Remove coolant thermostat.





Remove plug connections (2 and 3).

Installation note:
Plug connections (2 and 3) must snap audibly into place!

Unlock snap fastener on coolant hose (1).

Detach all coolant hoses and lay to one side.





Release screw (1).

Tightening torque 11 51 2AZ.





Remove vibration absorber (1).





Slacken nut (1).

Tightening torque 11 51 1AZ.





Release screw (1).

Slacken nut (2).

Tightening torque 11 51 1AZ.





Release screw (1).

Slacken nut (2).

Tightening torque 11 51 1AZ.





Installation note:
Replace gasket (1).

Replace coolant pipe (2).





Assemble engine.

Top up coolant.

Bleeding instructions must be observed without fail.