Removal and installation the coolant pump (BMW 5 Series E39)

The coolant pump is driven by a poly V-belt. The radiator fan is bolted to the coolant pump shaft at the front.

Removal

Drain the coolant, see section "Maintenance work".

Remove the poly V-belt.

Remove the radiator.

Loosen the bolts securing the poly V-belt pulley. Compress the belt to prevent the pulley from turning. Remove the poly V-belt pulley from the hub.



Remove 4 bolts securing the coolant pump. For a 6-cylinder 6-cylinder engine, loosen the nuts instead of the bolts shown.



Screw 2 M6 bolts into the threaded holes "arrows" to evenly press the pump body away from the engine. Make sure that the pump is not tilted. The figure shows the pump of a 6-cylinder engine. In a diesel engine, the threaded holes are located in a vertical plane opposite each other, see arrows in the figure W1841.

Installation

Remove the removal bolts, replace the coolant pump O-ring and lubricate it with standard silicone grease or petroleum jelly.

Insert the pump with a new seal and tighten the fastening evenly. The tightening torque of the bolts depends on the thread diameter: M6 - 10 Nm; M8 — 20 Nm.

Tighten the 4 belt pulley mounting bolts to 10 Nm.

Install and tension the poly V-belt.

Install a radiator with a fan.

Fill the coolant and bleed the cooling system, see section "Maintenance work".

Warm up the engine and check the tightness of the hose connections and the coolant pump.