11 51 000 Removing and installing/replacing coolant pump (N20)

WARNING: This page is about a different variant/trim than selected.

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 dirt contamination.

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.

Necessary preliminary tasks:

Follow diagnosis instruction.
Drain COOLANT .
NOTES cooling system.
Securing ENGINE IN INSTALLATION POSITION (only E89).

Release screws (1) from below.

Tightening torque 11 51 1AZ .

Fig 1: Identifying Coolant Pump Screws

Loosen hose clamps (1).

Installation note:

Note the installation position of the hose clamps.

Tightening torque 11 51 3AZ .

Fig 2: Identifying Hose Clamps

Release coolant hoses (1 and 2).

Disconnect connector (4).

Release screw (3).

Remove coolant pump (5) toward the top.

Fig 3: Identifying Coolant Pump, Coolant Hoses And Screw

Follow assembly instructions:

Installation note:

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

Fig 4: Identifying Hose Clamps

Installation note:

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

Assemble engine.

BLEEDING INSTRUCTIONS must be observed without fail.