3B7-65021-2 Water Pump Impeller for Nissan Tohatsu M60B M60C M70B M70C M80A M90A NS60B NS60C NS70B NS70C NS80A NS90A MD40B2 MD50B2 NSD40B2 NSD50B2 NSF50B | JLM Marine

Water Pump Impeller for Nissan Tohatsu M60B M60C M70B M70C M80A M90A NS60B NS60C NS70B NS70C NS80A NS90A MD40B2 MD50B2 NSD40B2 NSD50B2 NSF50B

This water pump impeller is engineered for Nissan and Tohatsu outboard motors ranging from 40 HP to 90 HP, covering both 2-Stroke and 4-Stroke engine configurations. Designed to fit models including the 120A, 140A, 70, and 90TLDI series, this impeller ensures reliable cooling system performance across a wide range of applications.

This replacement impeller directly replaces OEM part numbers 3B7-65021-2 and 3C7-65021-1, as well as superseded numbers 3B7-65021-0 and 3B7-65021-1, providing broad compatibility across multiple model years and engine variants.

• Constructed from neoprene with a brass hub for durability and corrosion resistance
• Compatible with both 2-Stroke and 4-Stroke engines across 40–90 HP range
• Lubricate with silicone grease, glycerine, or dish soap during installation (lubricant not included)

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

This package includes:

• 1 × Outboard Impeller (Neoprene)

Note: Lubricant (silicone grease, glycerine, or dish soap) is not included and must be purchased separately for installation.

Installation Guide

1. Preparation: Disconnect the battery and remove the lower unit from the outboard motor following your engine's service manual.
2. Access the pump housing: Remove the water pump housing cover to expose the old impeller.
3. Remove the old impeller: Carefully pull out the worn impeller and inspect the pump housing for debris or damage.
4. Clean the housing: Wipe down the interior surfaces to remove old gasket material and contaminants.
5. Lubricate the new impeller: Apply silicone grease, glycerine, or dish soap generously to all impeller blades and the brass hub.
6. Install the new impeller: Insert the impeller into the housing, ensuring blades are oriented in the correct rotation direction (typically clockwise).
7. Replace gaskets and seals: Use new gaskets where required to ensure a watertight seal.
8. Reassemble the pump housing: Secure the cover plate with fasteners torqued to manufacturer specifications.
9. Reinstall the lower unit: Attach the lower unit back onto the outboard motor, aligning the driveshaft properly.
10. Test the cooling system: Reconnect the battery, start the engine in a test tank or on muffs, and verify water discharge from the telltale port.
11. Inspect for leaks: Check all connections and seals for any water leakage during the test run.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
Cross-reference your engine model and year with the compatibility table above. Verify that your current impeller matches the OEM part numbers listed (3B7-65021-2 or 3C7-65021-1). If possible, compare the physical dimensions—6 blades, 60.30 mm overall diameter, and 20.30 mm shaft diameter.

How often should I replace the water pump impeller?
Most manufacturers recommend replacing the impeller every 2–3 years or every 200–300 hours of operation, whichever comes first. If you operate in sandy or silty water, inspect and replace more frequently to prevent cooling system failure.

What are the signs that my impeller has failed?
Common symptoms include reduced or no water flow from the telltale (indicator) port, engine overheating, steam from the cooling system, or a high-temperature alarm. Inspect the impeller immediately if any of these occur.

Can I use this impeller on both 2-Stroke and 4-Stroke engines?
Yes, this impeller is designed to fit specific Nissan and Tohatsu models across both 2-Stroke (60–90 HP) and 4-Stroke (NSF50B) configurations, as well as TLDI engines (40–50 HP). Always verify your exact model in the compatibility table.

What type of lubricant should I use during installation?
Use silicone grease, glycerine, or dish soap to lubricate the impeller blades and housing. Never install a dry impeller, as this can cause immediate damage. Do not use petroleum-based greases, which may degrade the neoprene material.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.