Water Pump Impeller – Fits Tohatsu/Mercury/Evinrude 2.5–6 HP (Replaces 369-65021-1, 3C8-65021-2)

Water Pump Impeller – Fits Tohatsu/Mercury/Evinrude 2.5–6 HP (Replaces 369-65021-1, 3C8-65021-2)

This aftermarket water pump impeller is a direct replacement for a wide range of Tohatsu, Mercury, and Evinrude/Nissan outboard motors. It is designed to meet or exceed original equipment specifications, ensuring reliable cooling performance for engines from 2.5 HP to 6 HP.

Directly replaces Tohatsu part numbers 369-65021-1 and 3C8-65021-2; Mercury 47-16154-3 and 8M0204676; Evinrude 5040180; and aftermarket parts Sierra 18-3098/18-8922.

• Installation Type: Direct Replacement
• Material: High-durometer Neoprene rubber for enhanced durability and performance.
• Design: Features 6 blades for efficient 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 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.

For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

Tohatsu

Mercury

Evinrude/Nissan

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 369-65021-1 or 3C8-65021-2)

Installation Guide

1. Disconnect Power: Start by disconnecting the battery and spark plug wires for safety.
2. Access Lower Unit: Locate and remove the bolts securing the lower unit (gearcase) to the engine leg.
3. Remove Pump Housing: Once the lower unit is off, unbolt and carefully lift the water pump housing to expose the impeller.
4. Replace Impeller: Slide the old impeller off the driveshaft. Clean the housing interior and inspect it for any scoring or damage.
5. Install New Impeller: Slide the new impeller onto the driveshaft. Important: Gently rotate the driveshaft clockwise while pushing down to ensure the blades curve correctly inside the housing.
6. Reassemble: Re-install the water pump housing, ensuring any gaskets or seals are correctly aligned. Re-attach the lower unit.
7. Test Operation: Reconnect the battery and test the engine in a suitable water source, confirming that water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: The most reliable method is to match your existing part number to those listed in our cross-reference table. You can also review the compatible engine model tables. For Mercury and Evinrude owners, we recommend using the serial number guides linked above to identify your specific model and year.

Q: What is the difference between part numbers 369-65021-1 and 3C8-65021-2?
A: While these two OEM part numbers apply to different engine horsepower ranges, our aftermarket impeller is manufactured to be physically identical and serve as a direct replacement for both, simplifying cross-compatibility.

Q: How often should I replace the water pump impeller?
A: For optimal engine protection, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. Replacement is especially crucial if operating frequently in saltwater or silty/sandy 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.