1151 7 527 910 | 1991-2006 BMW 3 5-Series X3 X5 M3 Z3 Z4 Water Pump with Metal Pulley

Fit In Five Steps

How to replace a BMW 3 5-Series X3 X5 M3 Z3 Z4 Water Pump with Metal Pulley

1.Find Parts

Know the year and model number of the car as well as the engine size when you look for your new water pump. You can generally find them in local auto parts stores as well as online.

2.Secure Vehicle

Allow the engine to cool completely and disconnect the battery. Put a drain pan under the engine and drain the entire cooling system. Remove the radiator cap. Install a pressure tester on the radiator. Apply the pressure indicated on the radiator cap or in the owner’s manual.

2.Remove Belts, Hoses, and the Pump

To work on the water pump, you’ll need to remove the drive belts and perhaps the engine pulley. Remove any parts that block your access to the water pump (there may be several) and detach any hoses from the pump. Carefully unbolt and remove the pump. Inspect the water pump for leaks. Remove the pressure tester. Place a drain pan under the radiator. Open the drain valve or remove the lower radiator hose to drain the cooling system. Remove the drive belts or serpentine belt. Remove any hoses connected to the water pump. Unbolt the water pump from the engine. Remove the old water pump.

3.Clean & Seal

Using a gasket scraper, clean the mounting surface on the engine block. Install a new gasket and attach the new water pump to the engine with the original mounting bolts. Tighten the bolts to the manufacturer’s specifications. Re-install any hoses and belts that were removed. Re-install the drain plug or lower radiator hose. Using a liquid engine cleaner and a rag, clean the engine block area, especially where the pump fits in.  Refill the radiator with a 50/50 mix of coolant and distilled water. Pressure test the cooling system and check for leaks. Replace the pump’s gaskets.

5.Replace New Water Pump

Check and fill the overflow reservoir with coolant. Leave the radiator cap off and start the engine. Idle the engine to remove trapped air from the cooling system. Add coolant if necessary. Carefully put the new pump in place and torque it according to manual specs. Replace all hoses and belts and tighten them appropriately. Install the radiator cap. Road test the vehicle and monitor the temperature gauge. If the vehicle runs hot, there may be an air pocket in the cooling system. Allow the engine to cool off and add the necessary coolant.