11 51 000 Removing and installing/replacing coolant pump (N55)

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 contamination.

Recycling:

Catch and dispose of drained coolant in a suitable container.

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:

Disconnect plug connection (1) from coolant pump.

Fig 1: Identifying Coolant Pump Plug Connection

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Release hose clamp (1 and 2).

Installation note:

Note installation hose clamps.

Tightening torque 11 53 5AZ .

Fig 2: Identifying Hose Clamps

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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 3: Identifying Hose Clamp

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Release screws (1).

Tightening torque 11 51 2AZ .

Installation note:

Replace screws.

Fig 4: Identifying Screws

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Installation note:

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

Assemble engine.

BLEEDING INSTRUCTIONS must be observed without fail .