Attention! The power steering pump can only be replaced as an assembly. Before installing the pump, fill its internal cavity with hydraulic fluid of the type "ATF Dexron II D" (Shell ATF Dexron II D-21–633). Pour the fluid from the suction side, turning the pump pulley until the fluid comes out from the discharge side.
The crankshaft and pump pulleys must be located in the same plane.
The pipeline ring seals installed in the ring groove of its nozzle must be replaced when installing the pipeline on the pump.
Close open pipes and holes in the pump with plugs/caps to prevent contamination of the system.
Power steering pump on engine m54
The basic layout of the power steering pump mount on the M54 engine is shown in Figure 12.50, the layout of the pipelines is shown in Figure 12.51. Power steering pump (ZF, 1, Fig. 12.50) mounted on holders (2,3) secured to the engine cylinder block.
The replacement of the power steering pump must be carried out in the following order: Using a clean syringe, pump out the fluid from the power steering reservoir and send it for disposal.
Remove the engine sump guard panel. Mark the direction of rotation and remove the drive belt. Mark the location of the hydraulic lines (pressure and drain). Disconnect the suction and discharge pipes from the pump.
Unscrew the mounting bolts (arrows, Fig. 12.52) and remove the power steering pump.
The pump installation should be carried out in the reverse order, while it is necessary to replace the sealing gaskets of the hollow bolts, and the bolts themselves (M14x1.5x26) tighten to 33 N·m (3.5 kgf·m). Tighten the pump mounting bolts to 20 N·m (2.0 kgf·m). Tighten the union nut of the pipeline to 36 N·m (3.6 kgf·m). Fill and bleed the power steering system, check the system for leaks.
The replacement of the power steering pump on the M57, M62 and N62 engines is carried out in a similar manner, using hollow bolts (M16x1.5x28), which are tightened to a torque of 39 N·m (3.9 kgf·m). On the N62 engine, the pressure line of the power steering pump is connected with a union nut, which is tightened to a torque of 36 N·m (3.6 kgf·m). Tighten the pump mounting nuts/screws to a torque of 21.4 N·m (2.14 kgf·m).
(The original is located on the internet portal: «BMWman»)