Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327)

Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327)

This water pump impeller repair kit is designed for Johnson/Evinrude 9.9 HP and 15 HP outboards. It provides a reliable solution for maintaining your engine’s cooling system, covering both 2-stroke models from 1974 onwards and 4-stroke models from 1995 onwards.

This kit serves as a direct replacement for several OEM and aftermarket part numbers, including Johnson/Evinrude 394711, Sierra 18-3327, and others, ensuring a precise fit and restoration of original performance.

• Complete Repair Solution: Includes a new impeller, housing, wear plate, seals, and all necessary hardware for a full replacement.
• Broad Compatibility: Fits a wide range of Johnson/Evinrude 9.9 HP and 15 HP engines over several decades.
• Direct-Fit Installation: Engineered to match OEM specifications for a straightforward installation without modifications.

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

This Complete Water Pump Impeller Kit includes:

• 1x Impeller (Replaces 386084, 18-3050)
• 1x Housing (Replaces 18-3180)
• 1x Wear Plate (Replaces 18-3178)
• 1x Water Pump Cup (Replaces 18-3179)
• 1x Grommet (Replaces 18-3329)
• 1x Grommet (Replaces 18-2392)
• 1x Oil Seal (Replaces 18-2025)
• 1x O-Ring (Replaces 18-7116)
• 1x O-Ring (Replaces 18-7139)
• 1x Pin (Replaces 18-3326)
• 4x Stainless Steel Bolts (Replaces 18-3369)

Installation Guide

1. Safety First: Disconnect the battery and remove the spark plug wires.
2. Access the Lower Unit: Shift the outboard into neutral. Remove the bolts securing the lower unit (gearcase) to the engine leg and carefully lower it.
3. Remove Old Pump: Unscrew the bolts holding the water pump housing. Slide the old housing and impeller off the driveshaft.
4. Clean and Inspect: Clean the driveshaft and mounting surfaces. Inspect for any damage or corrosion.
5. Install New Components: Lightly grease the new wear plate and install it. Slide the new impeller onto the driveshaft (turn the shaft clockwise to ease it in).
6. Reassemble Pump: Place the new housing, cup, and seals over the impeller and bolt it down securely.
7. Reattach Lower Unit: Realign the lower unit, ensuring the water tube and shift shaft connect properly. Bolt it back into place.
8. Test Operation: Reconnect the battery and spark plugs. Start the engine in water and check for a steady stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
Start by checking your engine's model, HP, and year against the "Compatible Engine Models" table. Next, cross-reference your existing part number with the numbers in the "Part Number Cross-Reference" table to ensure a match.

My engine is a newer Bombardier (BRP) 4-stroke model. Will this fit?
This kit is confirmed for Johnson/Evinrude 4-strokes up to 2004. Some later Bombardier-era models may use different parts (rebranded Tohatsu designs). Please verify your OEM part number before ordering. If unsure, contact us with your engine's serial number.

What are the signs of a failing water pump impeller?
Common symptoms include the engine running hotter than usual, a weak or non-existent water stream from the "tell-tale" outlet, and, in severe cases, an engine overheat alarm.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (especially in saltwater or sandy/silty water).

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.