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

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

This aftermarket water pump impeller is designed for Johnson/Evinrude 35-55 HP 2-Stroke outboard motors from 1958 to 1978. It serves as a direct replacement for the original component to ensure your engine maintains proper cooling and avoids overheating.

It directly replaces the following OEM and aftermarket part numbers: Johnson/Evinrude 377230, 777213, 777821; Sierra 18-3083; and Mallory 9-45209.

• Material: Constructed from durable neoprene rubber with a brass hub for saltwater resistance.
• Function: Restores pump performance to prevent engine overheating.
• Installation: Direct replacement fit in the water pump housing.

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 (Replaces 377230/777213)

Installation Guide

Professional installation is recommended. The general steps are as follows:

1. Safety First: Disconnect the battery and ensure the engine is off and cool.
2. Access the Lower Unit: Drain the gearcase oil, then unbolt and carefully remove the lower unit (gearcase) from the outboard motor.
3. Open Water Pump Housing: Locate the water pump assembly on top of the lower unit. Remove the bolts securing the housing cover.
4. Remove Old Impeller: Slide the old impeller off the drive shaft. Note the rotational direction of the old impeller blades if possible.
5. Install New Impeller: Lightly lubricate the new impeller and housing. Slide the new impeller onto the shaft, rotating it in the correct direction to seat the blades.
6. Reassemble: Reinstall the water pump housing, ensuring all seals and gaskets are correctly placed.
7. Reattach Lower Unit: Securely bolt the lower unit back onto the outboard and refill the gearcase oil.
8. Test Operation: Reconnect the battery and run the engine with a water supply to check for proper water flow and temperature.

Troubleshooting & FAQ

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

A: The best way is to check your OEM part number. This impeller replaces Johnson/Evinrude part numbers 377230, 777213, and 777821. You can also use the compatibility table on this page to verify your engine's HP, model, and year range.

Q: What are the signs of a bad or failing water pump impeller?

A: Common symptoms include the engine overheating, an intermittent or weak water stream from the "tell-tale" outlet, or an audible alarm from your engine's warning system.

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

A: As a general maintenance rule, it’s recommended to inspect and/or replace the impeller annually or every 100 hours of operation, whichever comes first. This interval can change based on usage patterns and water conditions.

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.