Sierra Water Pump Kit 18-3387 for Johnson/Evinrude Outboard Motors, Replaces 432956, Without Housing

The Sierra 18-3387 Water Pump Kit is a replacement water pump repair kit for Johnson/Evinrude outboard motors, supplied without a pump housing. It is built to replace the original equipment water pump components that wear out over time, restoring proper cooling water flow to the powerhead. The kit includes the core wear items needed for a water pump rebuild: an impeller, a grommet, and stainless steel mounting bolts, so the parts that typically fail or degrade in service are replaced together rather than piecemeal.

The impeller (Sierra 18-3053-1, O.E. 396725) is the pump's flexible drive component that pushes cooling water through the engine, and the grommet (Sierra 18-2703, O.E. 314008) seals the pump housing interface. Two stainless steel bolts (O.E. 319126) are included for corrosion-resistant reassembly. This kit is designed to meet or exceed the quality of the original equipment part it replaces, making it a straightforward drop-in solution for water pump service on compatible Johnson/Evinrude outboard motors.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3387
• Product Name: Water Pump Kit
• Housing Included: No (without housing)
• Impeller Part Number: 18-3053-1 (O.E. 396725)
• Grommet Part Number: 18-2703 (O.E. 314008)
• Bolt Material: Stainless Steel (O.E. 319126, Qty 2)
• UPC: 030999621559
• Weight: 0.98 pounds

Fitment

• Johnson/Evinrude outboard motors

Replaces (OEM)

• 432956

Frequently Asked Questions

What does the Sierra 18-3387 Water Pump Kit include? The kit includes an impeller (Sierra 18-3053-1, O.E. 396725), a grommet (Sierra 18-2703, O.E. 314008), and two stainless steel mounting bolts (O.E. 319126). It does not include a pump housing.

Does this kit come with a pump housing? No, the Sierra 18-3387 is a water pump kit without housing, meaning the existing housing is reused and only the internal wear components are replaced.

What OEM part number does the Sierra 18-3387 replace? The Sierra 18-3387 replaces OEM part number 432956.

What outboard motors is the Sierra 18-3387 designed for? This water pump kit is designed for Johnson/Evinrude outboard motors.

What is the impeller part number in this kit? The impeller included in the Sierra 18-3387 kit is Sierra part 18-3053-1, corresponding to O.E. Part 396725.

What is the grommet part number in this kit? The grommet included in the Sierra 18-3387 kit is Sierra part 18-2703, corresponding to O.E. Part 314008.

Are the mounting bolts included in the kit corrosion resistant? Yes, the Sierra 18-3387 kit includes stainless steel bolts (O.E. 319126) for corrosion-resistant reassembly.

How much does the Sierra 18-3387 Water Pump Kit weigh? The Sierra 18-3387 Water Pump Kit weighs 0.98 pounds.

Is the Sierra 18-3387 an OEM part or an aftermarket replacement? The Sierra 18-3387 is an aftermarket replacement kit engineered to meet or exceed the quality of the original equipment part it replaces, OEM 432956.

How many bolts are included with the Sierra 18-3387 kit? Two stainless steel bolts (O.E. 319126) are included with the Sierra 18-3387 Water Pump Kit.

What is the UPC for the Sierra 18-3387 Water Pump Kit? The UPC for the Sierra 18-3387 Water Pump Kit is 030999621559.