Removal and installation the water pump
Disconnect the wire from the "-" terminal of the battery, drain the liquid from the cooling system.
Remove the radiator. On automatic transmission models with an oil cooler, disconnect the inlet and outlet pipes at the bottom of the radiator and the wires from the coolant temperature gauge sensor.
Remove the fan and put aside its mounting bolts (M6x25 mm), which must be used again, since installing longer bolts will lock the fan's viscous coupling, and the drive will become permanent.
Remove the drive disk and clutch drum (see photo).
Remove the water pump.
The water pump is installed in the reverse order of removal.
Disassembling the water pump
As with disassembling a BMW engine water pump "518", "520", remove the drive flange, marking its position (apply a paint mark on the outer end).
Remove the retaining ring, press the impeller and remove the sealing and protective rings.
Assembling the water pump
Install the impeller by placing it on a sealant such as Loctite AVV and maintaining the dimension "B" of 0.9±0.2 mm, shown in the photo.
Press on the drive flange, maintaining dimension "A" 99.8±0.2 mm, shown in the photo.
