Gates 42018 Engine Water Pump

Gates 42018 Water Pump for BMW Cooling Systems

The Gates 42018 engine water pump is a standard replacement for select BMW cooling systems, including 1988-1993 BMW 325i, 1988-1991 BMW 325is, 1988-1991 BMW 325iX, 1989-1990 BMW 525i, and 1988 BMW 528e. Built for accessory-belt-driven applications, it is engineered to restore coolant circulation and support stable operating temperatures.

Gates Water Pump (Standard) components are built with premium alloy materials and tested for seal and bearing function as well as leakage integrity before release. This Gates 42018 water pump includes the gasket and is made for OE-quality fit in the listed BMW applications.

Key Features

• Engine water pump for accessory belt drive systems
• Cast aluminum housing for durable construction
• Cast iron impeller with standard rotation
• Includes water pump and gasket
• Single outlet design
• No back housing, thermostat housing, fan clutch, or pulley included
• Not timing-belt driven

Detailed Description

This Gates 42018 water pump is a direct-fit cooling system replacement for select BMW models, including BMW 325i and BMW 525i applications. The standard-rotation design, cast aluminum housing, and cast iron impeller are specified for dependable coolant flow in accessory-belt-driven engines. For buyers searching for a BMW 325i water pump, BMW 325is water pump, or BMW 528e cooling system replacement, this part provides a focused OE-style solution.

Gates manufactures this water pump with attention to seal and bearing performance, then verifies leakage at both the casting and assembled unit level. That process helps support consistent operation in everyday driving and routine cooling system service. Part number 42018 is also referenced in cross-application catalogs under Airtex AW9120.

What It Helps Address

• Coolant circulation problems caused by a worn pump
• Engine overheating from reduced coolant flow
• Leakage at the pump housing or seal area
• Noisy or rough pump operation from bearing wear
• Cooling system service on BMW 325i, 325is, 325iX, 525i, and 528e models

Installation Notes and Tips

Confirm accessory-belt drive configuration before installation. Replace the gasket supplied with the pump and inspect the mating surfaces, hoses, belt condition, and thermostat-related components during service. Verify the pump rotation and outlet orientation match the original part before final assembly. This part number 42018 is intended for the listed BMW fitments only.

Quality Assurance

Gates states that each new water pump is built from premium alloy materials and undergoes functional testing of seals and bearings, along with leakage testing of the casting and assembled unit. The result is an OE-quality fit for the specified BMW applications.

• Fits 1988-1993 BMW 325i, N/A
• Fits 1988-1991 BMW 325is, N/A
• Fits 1988-1991 BMW 325iX, N/A
• Fits 1989-1990 BMW 525i, N/A
• Fits 1988 BMW 528e, N/A