Oil pump — removal, inspection and installation (BMW 7 Series E32)

Removal

Remove the oil pan. Remove the three bolts securing the driven gear to the pump.

Note: On some models the gear is secured with one central nut.

Disconnect the oil pump from the engine block.



Remove the pump.

Inspection

Caution: Because a faulty oil pump can cause serious engine damage, it is recommended that the pump be replaced at every engine overhaul.

Remove the cover and inspect the housing, gears and rotors, and pump cover for cracks and signs of wear (especially on the contact surfaces of gears or rotors).

Make sure the mesh filter is not clogged or damaged.

Lubricate the gears with clean engine oil, then place the cover on the pump body and tighten the bolts evenly and securely.

Before installing the pump (new, refurbished or old) check its serviceability. Fill a clean container with fresh motor oil of the recommended viscosity (the oil level should not be lower than 2.5 cm).

Immerse the pump inlet in the oil and turn the drive shaft counterclockwise. Oil should flow out of the pump outlet.

Installation

Make sure the walls of the mounting recess are clean, then push the pump into place. Install the bolts and tighten them to the specified torque.

Install in reverse order.

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