Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711)

Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711)

This water pump impeller kit is designed for Johnson and Evinrude 8-15 HP 2-Stroke (1974-UP) and 9.9-15 HP 4-Stroke (1995-2001) outboard engines. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and restoring your engine's cooling system performance. Please note, this kit does not fit Johnson rebranded Suzuki outboards (2002-2007) or Bombardier-branded 4-stroke engines.

This kit provides a comprehensive solution for replacing your worn or damaged water pump components, helping to prevent engine overheating and ensure reliable operation on the water.

• Installation Type: Direct Replacement
• Impeller Design: Durable 6-fin neoprene impeller
• Complete Kit: Includes the impeller, housing, wear plate, cup, and all necessary gaskets, o-rings, and bolts for a full service.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Impeller (386084)
• 1 x Impeller Key (300611)
• 1 x Wear Plate (318995/18-3178)
• 1 x Pump Cup (324097/18-3179)
• 1 x Pump Housing (435390/18-3180)
• 3 x Grommet (338908/302497/327035/18-3329/18-2392)
• 2 x O-Ring (202893/319085/18-7116/18-7139)
• 1 x Pin (18-3326)
• 4 x Installation Bolt (302325/18-3369)

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Drain the lower unit gear oil completely.
3. Unbolt and carefully lower the gearcase from the drive shaft housing. Disconnect the shift shaft if necessary.
4. Place the gearcase on a workbench and remove the bolts securing the water pump housing.
5. Lift off the old pump housing, and carefully remove the impeller, cup, and wear plate, noting their orientation.
6. Remove the old impeller key, gaskets, and seals. Thoroughly clean all mating surfaces of debris and corrosion.
7. Install the new wear plate and gasket onto the gearcase.
8. Slide the new impeller key onto the driveshaft. Install the new impeller by pushing down while turning the driveshaft clockwise to seat the fins correctly inside the new pump cup.
9. Place the new O-rings and pump housing over the assembly, then tighten the bolts to the manufacturer's specified torque.
10. Carefully reinstall the lower unit, ensuring the driveshaft, water tube, and shift shaft are correctly aligned and seated.
11. Refill the gearcase with the correct type and amount of fresh gear oil.
12. Before launching, connect a water supply (flushing muffs) to the lower unit. Start the engine and confirm that a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

The best way is to verify your engine's model, horsepower, and year fall within the ranges listed in our "Compatible Engine Models" table. Pay close attention to the notes, especially the explicit exclusions for certain Johnson/Evinrude models (rebranded Suzuki and Bombardier 4-strokes).

Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and in severe cases, an engine alarm. If you notice any of these signs, you should inspect your cooling system immediately.

For preventative maintenance, it is highly recommended to replace the impeller and other kit components annually or every 100 hours of operation, whichever comes first. This helps prevent unexpected failures and potential engine damage from overheating.

This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.