Water Pump Impeller – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65021-1)

Water Pump Impeller – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65021-1)

This water pump impeller is a direct replacement part for a wide range of Tohatsu/Nissan 2-stroke and 4-stroke outboard engines from 2.5 HP to 6 HP (1992–present). It also fits various Mercury/Mariner 2-stroke (4–5 HP) and 4-stroke (2.5–6 HP) outboard motors.

Engineered for durability and efficient cooling, this impeller ensures your outboard maintains optimal operating temperature. It replaces Tohatsu P/N 369-65021-1 and Mercury/Mariner P/N 47-16154-3.

• Installation: Direct replacement for OEM component
• Material: High-strength neoprene rubber with a durable nylon hub
• Blades: 6

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.

Tohatsu/Nissan Models

Mercury/Mariner Models

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (369-65021-1)

Installation Guide

1. Disconnect the battery and remove the engine cover for safety.
2. Locate and unbolt the lower unit (gearcase) from the outboard leg.
3. Gently separate the lower unit to expose the water pump housing.
4. Remove the bolts securing the water pump housing cover.
5. Important: Note the rotational direction of the old impeller's blades before removal.
6. Remove the old impeller and thoroughly clean any debris from inside the housing.
7. Install the new impeller by pushing it down while turning the driveshaft in the correct direction (usually clockwise) to bend the blades properly.
8. Re-install the water pump housing and tighten the bolts to the manufacturer's specified torque.
9. Reattach the lower unit to the outboard leg and secure it.
10. Once assembled, test the engine in water and confirm a steady stream from the tell-tale port.

Troubleshooting & FAQ

Q: How do I know if this impeller fits my specific Tohatsu or Mercury model?

A: This impeller fits a wide range of Tohatsu/Nissan (2.5–6 HP) and Mercury/Mariner (2.5–6 HP) outboards. Please check the detailed "Compatible Engine Models" tables on this page and match your engine's model and serial number range. Verifying the OEM part number (369-65021-1 or 47-16154-3) is the most reliable method.

Q: What are the signs that my water pump impeller needs to be replaced?

A: Common signs of a failing impeller include a weak or non-existent water stream from the tell-tale port, engine overheating alarms, and visible cracks, stiffness, or missing blades on the impeller upon inspection.

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

A: For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use, whichever comes first. Replacement frequency should increase if operating 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.