3B2-65021-1 Outboard Impeller with Key for Tohatsu Nissan | JLM Marine

Outboard Impeller with Key for Tohatsu Nissan 6HP 8HP 9.8HP – OEM 3B2-65021-1

This outboard impeller with key is designed for Tohatsu and Nissan marine outboards ranging from 6HP to 9.8HP. Engineered to fit both 2-stroke and 4-stroke models, this impeller ensures reliable water pump performance and efficient engine cooling. It serves as a direct replacement for multiple OEM and aftermarket part numbers across the Tohatsu/Nissan lineup.

This impeller is compatible with popular models including the Nissan NS6B, NS8B, NS9.8B series and Tohatsu M6B, M8B, M9.8B, MFS8A, MFS9.8A series. Cross-references include 3B2-65021-1, Sierra 18-8920, CEF 500344, and AMIC 777-3B2, ensuring broad aftermarket compatibility.

• Includes impeller with hardened nylon hub and drive key (3B2-65022-0)
• Premium neoprene construction for durability and heat resistance
• 6-blade design for optimal water flow and cooling 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.

Technical Specifications

Package Contents

Your order includes:

• Outboard Impeller (1 pc) with drive key included

Installation Guide

1. Disconnect the spark plug wire and ensure the engine is off and cool before beginning work.
2. Remove the lower unit from the outboard following your engine's service manual procedures.
3. Access the water pump housing by removing the retaining bolts and separating the pump cover.
4. Extract the old impeller carefully; note the direction of the blade rotation for correct installation.
5. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion.
6. Lubricate the new impeller blades with glycerin, soapy water, or marine grease (never petroleum-based products).
7. Insert the drive key into the impeller hub slot, ensuring it is seated firmly.
8. Install the new impeller into the housing, rotating the blades in the correct direction (usually clockwise when viewed from below).
9. Replace gaskets and O-rings with new ones to prevent leaks; do not reuse old seals.
10. Reassemble the water pump housing and lower unit, torquing all bolts to manufacturer specifications.
11. Reconnect the lower unit to the outboard and refill the lower unit gear oil as required.
12. Test the water pump by running the engine in a test tank or on muffs; verify strong water discharge from the tell-tale.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Tohatsu or Nissan outboard?
A: Check the compatible engine models table above for your specific model number. Verify your original impeller part number matches one of the cross-references listed (3B2-65021-1, 18-8920, 500344, etc.). If unsure, compare the dimensions provided in the technical specifications with your current impeller.

Q: How often should I replace my water pump impeller?
A: We recommend replacing your impeller every 2-3 years or 200-300 hours of operation, whichever comes first. If you operate in sandy or debris-laden water, inspect it annually. Signs of wear include cracked blades, missing pieces, or reduced water flow from the tell-tale.

Q: What are the signs that my impeller is failing?
A: Common symptoms include weak or no water discharge from the tell-tale, engine overheating, steam from the exhaust, or reduced cooling system performance. If you notice any of these signs, shut down immediately and inspect the impeller.

Q: Can I use petroleum-based grease to install this impeller?
A: No, never use petroleum-based lubricants as they will damage the neoprene material. Use only glycerin, soapy water, or marine-grade water pump grease specifically designed for rubber impellers.

Q: Does this kit include the drive key?
A: Yes, this package includes the impeller with the drive key (part number 3B2-65022-0) already included, so you have everything needed for installation.

Q: What's the difference between OEM and aftermarket impellers?
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.