3C8-65021-2 Water Pump Impeller for Nissan Tohatsu 40D 50D | JLM Marine

Water Pump Impeller for Nissan Tohatsu 40D 50D – OEM 3C8-65021-2 Replacement

This water pump impeller is designed for Nissan and Tohatsu 2-Stroke 40D and 50D outboard engines. Engineered to deliver reliable cooling performance, it ensures your engine operates at optimal temperatures during every outing.

This aftermarket impeller directly replaces OEM part numbers 3C8-65021-2, 3C8650212, and 3C8650212M, providing a cost-effective solution without compromising on quality or fitment.

• Includes impeller with key/pin for complete installation
• Constructed from durable neoprene with nylon hub for long-lasting performance
• 6-blade design for efficient water flow and cooling

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

• Outboard Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor according to your engine's service manual.
2. Remove the water pump housing cover by loosening the mounting bolts.
3. Carefully extract the old impeller from the pump housing, noting its orientation and blade direction.
4. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion.
5. Lubricate the new impeller with water pump grease or soapy water to ease installation.
6. Insert the key/pin into the shaft slot, ensuring it is properly seated.
7. Install the new impeller onto the shaft, aligning the blades in the correct rotation direction (refer to your service manual).
8. Gently rotate the impeller to ensure all blades flex correctly and fit snugly inside the housing.
9. Replace the pump housing cover with a new gasket and tighten bolts evenly to the specified torque.
10. Reinstall the lower unit onto the outboard motor, ensuring all connections are secure.
11. Reconnect the fuel line and perform a water flow test by running the engine with the cooling system flushed.
12. Inspect for proper water discharge from the tell-tale outlet and check for leaks around the pump housing.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Nissan or Tohatsu engine?
A: Check the Compatible Engine Models table above for your specific model and year (2002-2017). Additionally, compare the impeller dimensions—6 blades, 50.40 mm diameter, 17.20 mm shaft—with your original part to ensure a perfect match.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2–3 years or 200–300 hours of operation, whichever comes first. If you notice overheating, reduced water flow from the tell-tale, or visible cracks/damage on the impeller blades, replace it immediately.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include engine overheating, weak or no water discharge from the tell-tale outlet, steam from the engine, and reduced performance. Inspect the impeller regularly for cracked, worn, or missing blades.

Q: Can I install this impeller myself or do I need a mechanic?
A: If you have basic mechanical skills and the proper tools, you can install it yourself by following the service manual. However, professional installation is recommended to ensure the cooling system operates correctly and to avoid potential engine damage.

Q: Is this an OEM or aftermarket impeller?
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.