11 51 000 Removing and installing/replacing coolant pump (N54)
Only perform this work after engine has cooled down.
Recycling:
Catch and dispose of drained coolant in a suitable collecting vessel.
Observe country-specific waste disposal regulations.
Installation note:
- All screws, nuts, bolts and hose clamps removed during the repair must be replaced.
- Retaining elements on chassis and suspension and steering parts must be replaced.
- In case there is contamination with engine oil, localize the oil leakage, clean and rectify.
Necessary preliminary tasks:
- Drain COOLANT .
Release screw (1).
Tightening torque 11 51 2AZ .
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 .
VENTING INSTRUCTIONS must be observed without fail .