Water Pump Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 377230, 777213)

Water Pump Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 377230, 777213)

This water pump impeller is designed for Johnson/Evinrude 2-stroke outboard engines, including 35 HP (1958–1959), 40 HP (1960–1970), 50 HP with small housing (1971–1978), and 55 HP (1971–1978) models.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring wide compatibility for a proper fit and reliable cooling performance.

• Direct OEM replacement for straightforward installation.
• Constructed from a durable rubber compound with a brass hub for excellent saltwater resistance.
• Maintains proper engine temperature by ensuring adequate water circulation.

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 Water Pump Impeller (Replaces 377230, 777213)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable and remove the engine cover.
2. Place a drain pan under the lower unit and remove the gearcase drain screw to empty the gear oil.
3. Remove the bolts securing the lower unit (gearcase) to the upper engine housing.
4. Carefully separate the lower unit from the engine to access the water pump assembly.
5. Remove the water pump housing bolts and lift the housing to expose the old impeller.
6. Note the rotational direction of the existing impeller blades before removing it from the driveshaft.
7. Clean the housing interior and wear plate, inspecting them for scoring, warping, or damage.
8. Slide the new impeller onto the driveshaft, turning the shaft clockwise to help seat the blades correctly.
9. Apply a thin layer of marine grease or soap-water solution to the inside of the housing and reinstall it.
10. Reassemble the lower unit to the engine, ensuring the driveshaft, shift shaft, and water tube align correctly.
11. Re-fill the gearcase with the specified lubricant before starting the engine.
12. Use a water muff to supply cooling water, start the engine, and confirm a steady stream from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?

Check your engine's model, horsepower, and year range against the compatible models table. The most reliable method is to cross-reference your existing part number with those in the "Part Number Cross-Reference" list to ensure a perfect match.

What are common signs of a failing water pump impeller?

Key indicators include the engine overheating, an alarm sounding, or a weak or nonexistent water stream from the tell-tale outlet. During a visual inspection, a worn impeller may have cracked, brittle, or deformed blades.

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 100-200 hours of use. This interval may be shorter if you operate frequently in saltwater or sandy/silty conditions.

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.