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 2-stroke and 4-stroke outboard engines. It provides a reliable solution for maintaining your engine's cooling system, ensuring optimal performance and preventing overheating. The kit is engineered to fit 8-15 HP 2-Stroke engines (1974-UP) and 9.9-15 HP 4-Stroke engines (1995-2001).

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Sierra 18-3327, Johnson/Evinrude 394711, 386697, 387610, 389112, and 391698. Important: It does not fit Johnson rebranded Suzuki outboards (2002-2007) or Bombardier-branded 4-stroke engines.

• Installation Type: Direct Replacement
• Impeller Design: 6-fin neoprene impeller for efficient water flow.
• Kit Contents: Includes impeller, wear plate, pump cup, housing, gaskets, and all necessary hardware for a complete overhaul.

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 Power: Disconnect the battery and spark plug wires to prevent accidental starting.
2. Access Lower Unit: Drain the gearcase oil and detach the lower unit (gearcase) from the outboard's midsection.
3. Remove Old Pump: Locate the water pump assembly on top of the lower unit. Unbolt and remove the old pump housing and components.
4. Clean Surfaces: Thoroughly clean the mounting surfaces, removing any old gasket material or corrosion.
5. Install New Components: Assemble the new kit components in reverse order, starting with the wear plate, gaskets, and pump cup.
6. Install Impeller: Slide the new impeller onto the driveshaft, ensuring the key is in place and rotating the shaft clockwise to seat the fins correctly inside the housing.
7. Secure Housing: Install the new housing and tighten the bolts to the manufacturer's recommended torque specifications.
8. Reassemble & Test: Reattach the lower unit, refill the gearcase oil, and reconnect the battery/spark plugs. Test the engine in water to verify proper water output from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this fits my engine?

Start by checking your engine's model, horsepower, and year against the "Compatible Engine Models" table. Be sure to check the notes, as some models have exceptions. Cross-reference the part number with your existing part or service manual. Pay close attention to the exclusion note: this kit does not fit Johnson-rebranded Suzuki engines (2002-2007) or Bombardier 4-strokes.

What are the signs my impeller needs replacement?

Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in cooling performance. It is recommended to replace the impeller every 1-2 years or every 100-200 hours of use, regardless of visible wear.

Does this kit fit 4-stroke models?

Yes, this kit is compatible with specific Johnson/Evinrude 9.9 HP and 15 HP 4-stroke outboard models from 1995 to 2001. It is not compatible with later Bombardier-branded 4-strokes.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.