Water Pump Impeller – Fits Johnson/Evinrude 10-35 HP (Replaces 375638, 775518)

Water Pump Impeller – Fits Johnson/Evinrude 10-35 HP (Replaces 375638, 775518)

This water pump impeller is engineered for Johnson/Evinrude 10-35 HP 2-stroke outboard motors manufactured between 1949 and 1978. It features a durable brass hub and 6 precision-molded blades to ensure reliable performance and proper cooling system function.

This component serves as a direct replacement for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 375638, 775518, and 777829, as well as Sierra 18-3002, GLM 89650, and Mallory 9-45215.

• Designed for direct, hassle-free installation.
• Constructed with a robust brass hub for enhanced durability.
• Maintains proper engine temperature by restoring cooling system efficiency.

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.

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 375638/775518)

Explosion Diagram

Installation Guide

1. Disconnect Power: Disconnect the spark plug wires and the negative battery terminal for safety.
2. Drain Gearcase: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gear oil.
3. Remove Lower Unit: Remove the bolts connecting the lower unit (gearcase) to the upper engine housing.
4. Access Pump Housing: With the lower unit removed, locate and unbolt the water pump housing cover.
5. Remove Old Impeller: Note the orientation of the old impeller blades before carefully sliding it off the driveshaft.
6. Clean and Inspect: Thoroughly clean the inside of the pump housing and inspect it for scoring or corrosion. Replace if damaged.
7. Install New Impeller: Lightly lubricate the new impeller and housing. Slide the new impeller onto the driveshaft while turning the shaft clockwise to bed the vanes correctly.
8. Reassemble: Reinstall the pump housing, ensuring all seals and gaskets are correctly seated. Torque bolts to manufacturer specifications.
9. Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, water tube, and shift shaft align. Securely fasten the bolts.
10. Refill and Test: Refill the gearcase with fresh lubricant. Reconnect the battery and spark plug wires, and test the engine using a water source (flushing muffs) to confirm water flows from the telltale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson/Evinrude engine?
A: First, check the "Compatible Engine Models" table to see if your engine's HP and year range are listed. Second, compare your existing part number to those in the "Part Number Cross-Reference" table. Matching the physical dimensions in the "Technical Specifications" provides a final confirmation.

Q: What are the signs of a failing water pump impeller?
A: Common signs include the engine overheating, a weak or intermittent water stream from the tell-tale outlet, or finding cracked, brittle, or broken blades during a visual inspection of the old impeller.

Q: How often should I replace the water pump impeller?
A: For preventative maintenance, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation. Service intervals should be shorter if the engine is used frequently in saltwater or sandy/silty 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.