Water Pump Impeller – Fits Johnson/Evinrude 2–4 HP Outboards (Replaces 433935, 396852)

Water Pump Impeller – Fits Johnson/Evinrude 2–4 HP Outboards (Replaces 433935, 396852)

This aftermarket water pump impeller is engineered to fit a range of Johnson/Evinrude 2-Stroke outboards, including 2, 2.5, 3, 3.5, and 4 HP models manufactured between 1987 and 2006 (including Ultra and Excel series).

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for engine cooling system maintenance.

• Direct Replacement: Installs without modification, matching OEM form and function.
• Durable Material: Constructed from a robust copper and rubber composite for reliable performance.
• Core Component: Includes one high-quality water pump impeller.

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 Water Pump Impeller (433935)

Explosion Diagram

Installation Guide

1. Disconnect the battery and drain the gear lube from the lower unit.
2. Remove the lower unit mounting bolts and carefully separate the lower unit from the upper housing.
3. Unscrew the water pump housing bolts and lift the housing off.
4. Note the rotational direction of the old impeller blades before removing it.
5. Remove the old impeller, gaskets, and drive key. Thoroughly clean all mating surfaces.
6. Install the new drive key into the shaft.
7. Slide the new impeller onto the driveshaft, rotating it in the correct direction to bed the blades.
8. Apply a light coat of marine grease to the housing interior and reinstall it.
9. Reattach the lower unit to the engine, ensuring all connections are secure.
10. Refill the lower unit with the correct gear lube.
11. Connect a water supply (flushing muffs) to the lower unit.
12. Start the engine and check for a steady water stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson/Evinrude engine?

A: This impeller is designed for Johnson/Evinrude 2-Stroke outboards from 2 HP to 4 HP, manufactured between 1987 and 2006. Please verify your engine model and year against the "Compatible Engine Models" table and cross-reference your existing part number with the numbers provided (e.g., 433935, 396852).

Q: What are the signs that my water pump impeller needs replacement?

A: Common signs of a failing impeller include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet, or finding rubber fragments in the cooling system.

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

A: 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 (e.g., saltwater vs. freshwater use).

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.