Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 25-35 HP (Replaces 389611/0389611)

Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 25-35 HP (Replaces 389611/0389611)

This comprehensive water pump repair kit is designed for Johnson/Evinrude 2-Stroke 25 HP (1977–1983) and 35 HP (1976–1980) outboard motors. It provides a reliable solution for maintaining your engine’s cooling system for optimal performance.

This kit serves as a direct replacement for Johnson/Evinrude OEM part numbers 389611 / 0389611 and equivalent aftermarket parts from Sierra and other brands, ensuring a precise fit and function.

• Engine placement is in the lower unit.
• Features a durable, saltwater-resistant neoprene impeller for longevity.
• Includes all necessary components for a complete rebuild, including the housing, pump, gasket, and bolts.

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 Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Impeller with Pin
• 1 x Housing (Replaces 330560 / Sierra 18-3363)
• 1 x Pump (Replaces 328751 / Sierra 18-3358)
• 1 x Gasket (Replaces 329390 / Sierra 18-3360)
• 1 x Grommet (Replaces 302497 / Sierra 18-3329)
• 4 x Bolts (Replaces 331979 / Sierra 18-3133)

Installation Guide

1. Safety First: Disconnect the battery and shift the outboard to neutral.
2. Access the Pump: Remove the lower unit (gearcase) from the outboard's driveshaft housing assembly.
3. Remove Old Pump: Unbolt and remove the existing water pump housing to access the impeller. Note the orientation of the old parts.
4. Clean Surfaces: Thoroughly clean the mounting base and driveshaft, removing any old gasket material or debris.
5. Install New Components: Place the new gasket and pump plate onto the gearcase.
6. Install Impeller: Slide the new impeller onto the driveshaft. Apply a light coat of marine grease to the inside of the pump housing to ease installation.
7. Install Housing: Press the new pump housing down over the impeller while turning the driveshaft clockwise to set the vanes correctly.
8. Secure Housing: Fasten the housing with the new bolts, tightening them evenly to the manufacturer's torque specifications.
9. Reassemble: Reinstall the lower unit, refill the gearcase with fresh lubricant, and reconnect the battery.
10. Test Operation: Start the engine in water and verify a strong, consistent stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit will fit my Johnson engine?
Verify that your engine is a 2-stroke 25 HP (manufactured between 1977–1983) or a 35 HP (1976–1980). The most reliable method is to cross-reference the OEM part number, which should be 389611 or 0389611.

What are the signs my water pump needs replacing?
The most common signs are engine overheating, an intermittent or weak water stream from the "tell-tale" cooling outlet, or discovering the impeller is cracked, brittle, or has broken vanes during a routine inspection.

How often should I replace the water pump impeller?
For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years. Replacement frequency should increase with heavy use, especially in saltwater or in water with high levels of sand or silt.

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.