345-65021-0 Water Pump Impeller for Nissan Tohatsu | JLM Marine

Water Pump Impeller 345-65021-0 – Fits Nissan & Tohatsu 25–40 HP Outboard Motors

This high-quality water pump impeller is engineered for Nissan and Tohatsu outboard motors ranging from 25 HP to 40 HP, covering both 2-stroke and 4-stroke engines. Designed to fit multiple series including 25C, 30A, 40C models and all MFS25/MFS30 Series A & B variants, this impeller ensures reliable cooling system performance across a wide range of applications.

Direct replacement for OEM part numbers 345-65021-0, 345650210, and 345650210M. Compatible with Nissan NS25, NS30, NS35, NS40, NSF25, NSF30 engines, as well as Tohatsu M25C, M30A, M35, M40C, MFS25B, and MFS30B series motors from 1996 through 2017.

• Constructed from durable neoprene with a nylon hub for long-lasting performance
• Features 6 blades with precise dimensions: 44.10mm diameter, 20.30mm depth, 17.30mm shaft diameter
• Critical: Verify your outboard engine model before purchase—installation requires lubrication with silicone grease, glycerin, or dish soap (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

• 1 × Outboard Impeller

Installation Guide

1. Preparation: Disconnect the fuel line 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 bolts and carefully separate the housing to expose the old impeller.
3. Remove old impeller: Extract the worn impeller from the pump shaft. Inspect the housing and liner for wear, cracks, or debris.
4. Clean all surfaces: Thoroughly clean the pump housing, wear plate, and shaft to remove old gasket material and corrosion.
5. Lubricate new impeller: Apply a generous amount of silicone grease, glycerin, or dish soap to all impeller blades and the inner hub.
6. Install impeller: Carefully slide the new impeller onto the drive shaft, ensuring blades face the correct rotation direction (check service manual).
7. Align blade tips: Gently rotate the impeller clockwise (or per manufacturer spec) while seating it to ensure blades align properly within the housing.
8. Replace gaskets and seals: Install new gaskets, O-rings, and wear plates as needed to prevent leaks.
9. Reassemble pump housing: Carefully position the housing over the impeller and tighten bolts evenly in a cross-pattern to manufacturer torque specifications.
10. Reinstall lower unit: Align the drive shaft and water tube, then secure the lower unit to the motor.
11. Test operation: Reconnect fuel, start the engine in a test tank or on muffs, and verify strong water flow from the telltale (pee hole).
12. Final inspection: Check for leaks around the pump housing and ensure smooth engine operation at idle and under load.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Nissan or Tohatsu engine?
A: Cross-reference your engine model and year with the compatibility table above. Verify that your original impeller matches the dimensions listed (44.10mm diameter, 20.30mm depth, 17.30mm shaft diameter, 6 blades) and that your OEM part number is 345-65021-0, 345650210, or 345650210M.

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

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include engine overheating, weak or no water discharge from the telltale (pee hole), steam from the engine, loss of power, and the high-temperature warning alarm activating. Inspect the impeller if any of these occur.

Q: Can I install this impeller without professional help?
A: While mechanically inclined owners can perform this replacement, proper disassembly of the lower unit and pump housing is required. You must lubricate the impeller correctly and torque all fasteners to spec. If you lack experience with outboard service, professional installation is strongly recommended.

Q: Is this an OEM part or an aftermarket replacement?
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.