11 51 000 Removing and installing/replacing coolant pump (N20) all-wheel drive vehicle

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:

Release screws (1) from below.

Tightening torque 11 51 1AZ .

Fig 1: Identifying Coolant Pump Screws

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Loosen hose clamps (1).

Installation note:

Note the installation position of the hose clamps.

Tightening torque 11 51 3AZ .

Fig 2: Identifying Hose Clamps

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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

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Follow assembly instructions:

Installation note:

Hose clamps (1) must be installed in the center of the marked area (see illustration).

Fig 4: Identifying Hose Clamp

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Attach coolant pump with screw (1).

Tightening torque 11 51 1AZ .

Connector (2) must snap audibly into place.

Fig 5: Identifying Coolant Pump Connector And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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.