Water Pump Impeller with Key and Gasket – Fits Johnson/Evinrude 5.5-7.5 HP (Replaces 763735, 387361)

Water Pump Impeller with Key and Gasket – Fits Johnson/Evinrude 5.5-7.5 HP

This water pump impeller kit is a direct replacement for Johnson/Evinrude 5.5 HP & 6 HP (1954–1979) and 7.5 HP (1954–1958) outboard engines equipped with a metal pump housing. It is engineered to meet or exceed original equipment specifications for reliable cooling performance.

It directly replaces Johnson/Evinrude part numbers 763735, 0763735, 387361, 0387361, 777831, and 0777831.

• Complete Kit: Includes the impeller, housing gasket, and drive shaft key for a comprehensive service.
• Specific Fitment: Designed exclusively for models with the original metal pump housing.
• Durable Construction: Made with a robust rubber impeller and includes all necessary components for installation.

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 763735)
• 1 x Impeller Housing Gasket
• 1 x Drive Shaft Key (Replaces 0321130)

Installation Guide

Follow these general steps to replace your water pump impeller. Always consult your engine's service manual for detailed instructions.

1. Safety First: Disconnect the battery and remove the spark plug wires.
2. Access the Pump: Shift the outboard into neutral and remove the lower unit (gearcase) from the engine leg.
3. Remove Housing: Unbolt and carefully lift the water pump housing. Take note of how the old impeller's vanes are bent.
4. Remove Old Parts: Slide the old impeller off the driveshaft. Remove the old drive key and gasket, ensuring the mating surfaces are clean.
5. Install New Gasket: Place the new gasket onto the base of the pump.
6. Install New Impeller: Insert the new drive key into its slot on the driveshaft. Slide the new impeller on, twisting it clockwise to bend the vanes correctly as you lower the housing over it.
7. Reassemble: Bolt the pump housing back down to the specified torque.
8. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
9. Test Operation: Reconnect the battery and start the engine in a suitable water supply (using flush muffs or in the water). Confirm a steady water stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: This impeller is specifically for Johnson/Evinrude 5.5 HP & 6 HP (1954–1979) and 7.5 HP (1954–1958) outboards that use a metal pump housing. The best way to ensure compatibility is to cross-reference your engine's original part number with the numbers we provide (e.g., 763735, 387361).

Q: What are the signs of a failing water pump impeller?
A: Key indicators include a weak or nonexistent water stream from the engine's tell-tale outlet, engine overheating alarms, or a melted water pump housing. Upon inspection, a bad impeller may have cracked, brittle, or missing vanes.

Q: How often should I replace the impeller?
A: For preventative maintenance, we recommend replacing the impeller every 1-2 years or every 100-200 hours of operation. Frequent use in sandy or silty water may require more frequent inspections and replacements.

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.