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

Only perform this work after engine has cooled down.

Attention! 

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: 

1. All screws, nuts, bolts and hose clamps removed during the repair must be replaced.
2. Retaining elements on chassis and suspension and steering parts must be replaced.

Necessary preliminary tasks: 

• Drain COOLANT .
• Remove ENGINE SPLASH GUARD .
• Remove FAN COWL .
• Release STEERING BOX (do not remove).

Disconnect plug connection (1).

Release coolant hose (2).

Installation note: 

Note installation hose clamps.

Tightening torque 11 53 9AZ .

Fig 1: Identifying Coolant Pump Plug Connection And Coolant Hose

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Release coolant hose (1).

Installation note: 

Note installation hose clamps.

Tightening torque 11 53 5AZ .

Fig 2: Identifying Coolant Pump Coolant Hose (N55)

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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 Coolant Pump Hose Clamps

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Release screws (1).

Tightening torque 11 51 2AZ .

Installation note: 

Replace screws. 

Fig 4: Identifying Coolant Pump Screws

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Unclip cable (1) from bracket.

Release screw (2).

Tightening torque 11 51 2AZ .

Fig 5: Identifying Coolant Pump Cable And Screw

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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 impeller.

Assemble engine.

BLEEDING INSTRUCTIONS must be observed without fail.