BMW E36 water pump and its replacement
When does the E36 water pump need replacing?
The pump often fails between 150,000 and 200,000 km, so replacing it at around 150,000 km is advisable. Signs are squealing or a strange noise from the engine bay. A failed pump can also throw the belt off.
What is the weak point of a water pump with a plastic impeller?
The plastic impeller can come loose from its shaft, so the pump spins freely and coolant circulation stops. The temperature then rises while driving. The bearing also wears. A pump with a metal impeller is the better option, so check the impeller material before buying.
How do I replace the water pump on an M50?
1. Drain the coolant from the lower radiator hose. 2. Loosen the ribbed belt tensioner and remove the belt. 3. Remove the viscous fan clutch with a 32 mm spanner; its thread is reversed. 4. Remove the pump bolts and pull the pump out. 5. Install and bleed the system carefully. Bleeding is the trickiest stage of the job.
What else should be replaced along with the water pump?
The thermostat and thermostat housing should be replaced if they have not been renewed recently. Also check the condition of the ribbed belt.