Water Pump Impeller Repair Kit with Housing – Fits Johnson/Evinrude 25-50 HP (Replaces 438592)

Water Pump Impeller Repair Kit with Housing – Fits Johnson/Evinrude 25-50 HP (Replaces 438592)Water Pump Impeller Repair Kit with Housing Fits Johnson Evinrude 25 50 HP (Replaces 438592) This water pump impeller repair kit is designed for a range of Johnson Evinrude 2 Stroke 25 50 HP outboard engines. It is primarily compatible with 40 50 HP two cylinder models manufactured between 1989 and 2005, and also fits specific 25, 28, 30, and 35 HP jet drive units. This kit serves as a direct replacement for Johnson Evinrude OEM part numbers 0438592

Water Pump Impeller Repair Kit with Housing – Fits Johnson/Evinrude 25-50 HP (Replaces 438592)

This water pump impeller repair kit is designed for a range of Johnson/Evinrude 2-Stroke 25-50 HP outboard engines. It is primarily compatible with 40-50 HP two-cylinder models manufactured between 1989 and 2005, and also fits specific 25, 28, 30, and 35 HP jet drive units.

This kit serves as a direct replacement for Johnson/Evinrude OEM part numbers 0438592/438592, 433548/433549/777805, and Sierra aftermarket part numbers 18-3454/18-3394.

• Includes a new pump housing for a complete overhaul.
• Engineered for the small gearcase configuration with a three-vane impeller.
• Installed in the lower unit/gearcase.

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 Neoprene Impeller, 3-vane (Replaces 432941/437059/765350)
• 1 x Wear Plate (Replaces 321940)
• 1 x Insert Cup/Water Pump Cup (Replaces 340619)
• 1 x Water Pump Gasket (Replaces 336530)
• 1 x Key/Impeller Key (Replaces 334897)
• 1 x O-Ring
• 1 x Water Seal/Oil Seal (Replaces 315748)
• 1 x Pump Housing
• 1 x Grommet (Replaces 333758)
• 4 x Installation Bolts, Stainless Steel (Replaces 331979)

Installation Guide

1. Safety First: Disconnect the battery and disable the ignition system.
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 the Old Pump: Unscrew the bolts holding the water pump housing. Lift the housing to expose the impeller and other components.
4. Inspect and Clean: Note the orientation of the old impeller vanes. Remove the old impeller, key, wear plate, and seals. Clean all surfaces of debris and old gasket material.
5. Install New Components: Place the new gasket and wear plate. Install the new impeller key into the driveshaft.
6. Install the New Impeller: Slide the new impeller onto the driveshaft, rotating the shaft clockwise to seat the vanes correctly within the new pump cup/housing.
7. Reassemble the Pump: Apply sealant to the new gasket, install the new housing, and tighten the bolts to the manufacturer's specified torque.
8. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned. Securely tighten all bolts.
9. Test the System: Reconnect the battery. With the outboard submerged in water, start the engine and verify a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How can I be sure this kit fits my Johnson/Evinrude engine?

A: The best way is to match your engine's model, horsepower, and year against the compatibility chart. This kit fits various 25-50 HP models, primarily from 1989-2005. Critically, ensure your engine requires OEM part number 438592, which this kit replaces.

Q: What are the signs that my water pump impeller needs to be replaced?

A: Common signs include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the "tell-tale" exhaust port, or finding a brittle, cracked, or deformed impeller during a routine inspection.

Q: How often should I replace my water pump impeller?

A: As a crucial part of 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 cloudy/sandy water.

Q: Does this kit include the housing?

A: Yes, this is a complete water pump repair kit that includes the pump housing, impeller, wear plate, gaskets, seals, and installation bolts required for a full replacement.

Q: OEM vs. Aftermarket?

A: 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.

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

A: 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.

Q: What is your warranty and return policy?

A: 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.