11 51 000 Removing and installing/renewing coolant pump (N74)

Only perform this work after engine has cooled down.

Coolant emerges when the coolant hoses are detached from the coolant thermostat and coolant pump.

Cover surrounding components and plug connections with suitable apparatus

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 FAN COWL with electric fan.
• Remove alternator DRIVE BELT 
• Remove COOLANT THERMOSTAT .

Remove plug connections (2 and 3).

Installation note: 

Plug connections (2 and 3) must snap audibly into place!

Unlock snap fastener on coolant hose (1).

Detach all coolant hoses and lay to one side.

Fig 1: Identifying Coolant Hose And Plug Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque: see 2AZ in 11 51 COOLANT PUMP

Fig 2: Identifying Coolant Pump Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Remove VIBRATION ABSORBER  (1).

Fig 3: Identifying Vibration Absorber

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Tightening torque: see 1AZ in 11 51 COOLANT PUMP

Fig 4: Identifying Coolant Pump Slacken Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Slacken nut (2).

Tightening torque: see 1AZ in 11 51 COOLANT PUMP

Fig 5: Identifying Coolant Pump Slacken Nut And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Slacken nut (2).

Tightening torque: see 1AZ in 11 51 COOLANT PUMP

Fig 6: Identifying Coolant Pump Slacken Nut And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Replace gasket (1).

Replace coolant pipe (2).

Fig 7: Identifying Coolant Pipe And Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

BLEEDING INSTRUCTIONS must be observed without fail  .