Water Pump Impeller – Fits Johnson/Evinrude 2–4 HP Outboards (Replaces 0433935, 0396852, 0767407)

Water Pump Impeller – Fits Johnson/Evinrude 2–4 HP Outboards (Replaces 0433935, 0396852, 0767407)

This water pump impeller is designed for Johnson/Evinrude 2–4 HP, 2-Stroke outboards from 1987–2006. It is compatible with a range of engines including 2 HP (2001), 2.5 HP (1987–1988), 3 HP (1989–1997), 3.5 HP (2002–2006), and 4 HP (1987–2006).

It serves as a direct replacement for Johnson/Evinrude part numbers 0433935, 0396852, and 0767407, as well as Sierra Marine part number 18-3015.

• Installation: Direct OEM replacement that fits the drive shaft with a key.
• Material: Constructed from durable neoprene rubber with a metal alloy hub for reliable performance in marine environments.
• Fuel Type: Compatible with 2-Stroke marine engines.

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

Installation Guide

Follow these general steps to replace your water pump impeller. Professional installation is recommended.

1. Prepare the Engine: Disconnect the battery and shift the outboard into neutral.
2. Access the Lower Unit: Remove the bolts securing the lower unit (gearcase) to the engine's upper section.
3. Remove the Lower Unit: Carefully lower the gearcase away from the engine. You may need to disconnect a speedometer tube or shift linkage.
4. Open the Water Pump Housing: Locate the water pump assembly on top of the gearcase and remove the housing bolts to lift the cover.
5. Remove the Old Impeller: Take note of the blade orientation. Slide the old impeller off the drive shaft, removing the woodruff key if present.
6. Clean and Inspect: Clean the inside of the pump housing and inspect it for wear, scoring, or cracks. Replace the housing if damaged.
7. Install the New Impeller: Place the woodruff key into its slot on the drive shaft. Slide the new impeller onto the shaft, rotating the shaft clockwise to help bend the blades into position inside the housing.
8. Reassemble the Pump: Reinstall the water pump housing and tighten the bolts to the manufacturer's torque specifications.
9. Reattach the Lower Unit: Guide the lower unit back into position, ensuring the drive shaft, water tube, and shift shaft align correctly. Secure it with the bolts.
10. Test the System: Reconnect the battery. With the outboard in water, start the engine and check for a steady stream of water from the "telltale" outlet, confirming correct pump operation.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
Start by checking the "Compatible Engine Models" table on this page. It lists specific models, years, and horsepower ratings. We also provide a link to the Johnson/Evinrude serial number guide to help you identify your exact model if you are unsure.

How often should I replace the water pump impeller?
For optimal performance and to prevent overheating, it is recommended to replace the impeller every 100 operating hours or at least once a year, typically as part of your seasonal maintenance before spring launch or winterization.

What are the signs of a failing impeller?
Common symptoms include the engine running hotter than normal, a weak or non-existent water stream from the "telltale" pee hole, or visible damage such as cracked, brittle, or broken blades on the old impeller upon inspection.

Is the woodruff key included?
The impeller requires a woodruff key for installation on the drive shaft. The data notes that the package contents can vary. Please verify with the specific product listing if the key is included, as you may need to source one separately.

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.