Metelli PA1178 Engine Water Pump

Metelli PA1178 Engine Water Pump

The Metelli PA1178 engine water pump is a new replacement part for select BMW diesel applications, including the X5, 535d, 535d xDrive, and 740Ld xDrive. Built with an aluminium housing, cast iron impeller, and integrated pulley, it is specified for direct cooling-system service where OE-style fitment matters.

Key Features

• New engine water pump assembly
• Includes pulley with 6 grooves
• Gasket included in the package
• Aluminium housing for the pump body
• Cast iron impeller with 6 vanes
• Ball/Ball bearing design
• Impeller outside diameter: 60.5 mm
• Bearing outside diameter: 30 mm
• Pulley width: 22.3 mm

Detailed Description

Metelli PA1178 is an engine water pump built for cooling-system replacement on BMW diesel models that require part number PA1178 or OE cross-reference 11 51 8 516 205. The pump uses a cast iron impeller, aluminium housing, and ball/bal bearing construction to match the demands of engine coolant circulation service. With the pulley included and a 6-groove design, this unit is specified for applications where the accessory drive layout must remain consistent with the original setup. This part cross-references OE number 11 51 8 516 205 for the same application.

Vehicle Fitment

• Fits 2014-2018 BMW X5, N/A
• Fits 2014-2016 BMW 535d, N/A
• Fits 2014-2016 BMW 535d xDrive, N/A
• Fits 2015 BMW 740Ld xDrive, N/A

Common Replacement Reasons

• Coolant circulation loss from a worn pump
• Noise from bearing wear in the water pump assembly
• Coolant leakage at the pump sealing surface
• Drive pulley wear or mismatch during cooling-system repair
• Overheating caused by reduced coolant flow

Installation Notes and Tips

Confirm OE number 11 51 8 516 205 and verify pulley groove count, pulley width, and mounting configuration before installation. Replace the gasket supplied with the pump and inspect the belt drive, hoses, thermostat, and coolant condition during service. Proper cooling-system bleeding is important after installation on BMW X5, 535d, 535d xDrive, and 740Ld xDrive applications.

Quality Assurance

Metelli supplies new cooling-system components built to OE-style specifications for direct replacement use. The PA1178 is a new part and includes the gasket listed in the package contents.