2016-2019 BMW 7 Series 4.4 Water Pump 863795202

Also known as

Coolant Pump

Engine Water Pump

Mechanical Water Pump

Engine Cooling Pump

Primary Water Pump

What this part does

The water pump is a mechanical component responsible for circulating engine coolant between the engine block, cylinder heads, and radiator. It is driven by the accessory belt and uses an internal impeller to maintain continuous fluid flow, which is critical for regulating engine operating temperatures. When this unit begins to fail, it typically presents as a coolant leak from the weep hole, an audible bearing whine from the front of the engine, or sudden temperature spikes on the gauge. Complete failure stops coolant circulation entirely, leading to immediate engine overheating.

Fits these vehicles

OEM and interchange numbers

863795202

11518637952

11-51-8-637-952

8637952

Before you order

• Verify your current part number. BMW uses multiple pump designs across the 4.4L V8 platform depending on cooling system configurations and build dates.
• It is standard practice to replace the engine thermostat and the accessory drive belt when installing a replacement water pump.
• Inspect the water pump pulley for hairline cracks or warping before transferring it to this unit, as a damaged pulley will rapidly wear the new bearings.
• Ensure the cooling system is properly bled and refilled with the correct factory-specification coolant to prevent air pockets and cavitation.