11 51 000 Removing and installing/replacing coolant pump (W20)

Special tools required: 

• 17 2 050 
• 2 288 154 
• 11 4 470 
• 24 5 420 

Recycling: 

Catch and dispose of drained coolant in a suitable collecting vessel.

Observe country-specific waste disposal regulations.

Preliminary work needed: 

• Completely remove drive unit (range extender). Refer to REMOVING AND INSTALLING COMPLETE DRIVE UNIT (RANGE EXTENDER) (I3 BASE, I3S) .
• Remove engine from drive unit. Refer to REMOVING AND INSTALLING ENGINE FROM DRIVE UNIT (I3 BASE, I3S) .
• Refer to REMOVING OIL SUMP .

Remove surge plates from crankcase.

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Release coolant hoses (1) by means of special tool 17 2 050  .

Unscrew the screws (2).

Remove housing (3) of coolant pump.

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Release circlip (1) by means of special tool 2 288 154  .

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Press out impeller (1) in arrow direction.

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Detach coolant pump wheel (1) with shaft in arrow direction.

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Remove sealing ring (1) coolant by means of an adequate tool.

Clean sealing surface (2) with special tool 11 4 470  .

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Remove sealing ring (1) crankcase (oil) by means of angled pliers (2) in arrow direction.

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Position the input shaft seal (1) on special tool 24 5 420  .

Check installed direction.

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Press in shaft seal by means of special tool 24 5 420  to the stop in the crankcase.

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Press in sealing ring (1) coolant by means of an adequate tool.

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Installation note: 

Bleeding instructions. Refer to VENTING AND FILLING COOLANT CIRCUIT (HIGH-TEMPERATURE COOLING SYSTEM) FOR RANGE EXTENDER WITH VACUUM FILLING UNIT must be observed without fail  .

Assemble engine.