11 51 000 Removing and installing/renewing coolant pump (N20, N26)

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 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.
Secure ENGINE IN INSTALLATION POSITION .

Release screws (1) and remove cover (2) (if installed).

Slightly raise engine to gain better accessibility to coolant pump screws.

Fig 1: Identifying Coolant Pump Cover And Screws

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Release screws (1) on the bottom of the coolant pump.

Tightening torque 11 51 2AZ .

Fig 2: Identifying Screws Of Coolant Pump

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Loosen hose clamps (1).

Installation note:

Note the installation position of the hose clamps.

Tightening torque 11 51 3AZ .

Fig 3: Identifying Hose Clamps

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Release coolant hoses (1) and (2).

Unlock plug (4) and remove.

Release screw (3).

Tightening torque 11 51 2AZ .

Remove coolant pump (5).

Fig 4: Identifying Connector, Coolant Hoses And Pump

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Follow assembly instructions:

Installation note:

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

Fig 5: Identifying Hose Clamps

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Installation note:

Attach coolant pump with screw (1).

Connector (2) must snap audibly into place.

Fig 6: Identifying Cable Plug Of Coolant Pump

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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.