11 51 000 Removing And Installing/Replacing Water Pump (N51)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Danger of scalding!
Only perform these tasks on an engine that has cooled down.

Recycling:

Catch and dispose of drained coolant.

Observe country-specific waste-disposal regulations.

IMPORTANT: Aluminum-magnesium materials. No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. Aluminum screws/bolts must be replaced each time they are released . Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic . Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove coolant thermostat . See 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (N51) .
Disconnect water hose (1).

Disconnect plug connection (4).

Release screws (5).

Fig 1: Identifying Water Hose And Plug Connection
Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace aluminum screws .

Tightening torque. See 11 51 1AZ in 11 51 WATER PUMP AND DRIVE .

Installation:

If the water pump is to be reused, it must be mechanically rotated once (breakaway torque at impellers).

One water pump rotation will be sufficient.

Assemble engine.

Venting instructions must be observed without fail.