Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 25–40 HP 2-Stroke (Replaces 361-87322-0)

Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 25–40 HP 2-Stroke (Replaces 361-87322-0)

This water pump repair kit is designed for Tohatsu and Nissan 25–40 HP 2-Stroke outboard engines (1996–2005). It is also compatible with select Mercury 25–30 HP 4-Stroke EFI engines from 2002 and later (serial numbers 0R051710 and up).

This is a complete service kit that serves as a direct replacement for the OEM assembly, containing all the necessary components for a full water pump overhaul to restore your engine's cooling performance.

• Installation: Direct OEM Replacement
• Compatibility: Fits Tohatsu, Nissan, and Mercury outboard engines as specified in the tables below.
• Complete Kit: Includes a new impeller, wear plate, housing liner, gaskets, and bolts for a full service.

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

Mercury Marine

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (345-65021-0/47-161541)
• 1 x Key Driveshaft (332-65022-0)
• 1 x Wear Plate Stainless Steel (348-65025-0)
• 1 x Cup Liner Stainless Steel (348-65011-0)
• 1 x Gasket Set
• 4 x Bolts with Washers

Installation Guide

Professional installation is recommended. The following are general steps and may not be exact for your model.

1. Disconnect the spark plug leads and the battery.
2. Drain the gearcase lube from the lower unit.
3. Remove the propeller.
4. Unbolt and carefully slide the lower unit off the drive shaft housing.
5. Remove the water pump housing bolts and slide the housing up the driveshaft.
6. Take note of the old impeller's orientation, then remove it, along with the old gaskets, wear plate, and cup liner.
7. Clean the mounting surfaces thoroughly.
8. Install the new gasket and stainless steel wear plate.
9. Slide the new impeller onto the driveshaft, turning the shaft clockwise to seat the vanes correctly. Install the drive key.
10. Install the new cup liner and gasket, then reinstall the housing and tighten the bolts to the manufacturer's torque specs.
11. Re-install the lower unit, propeller, and refill the gearcase with fresh lube.
12. Reconnect the battery and test the engine's cooling function in water before operation.

Troubleshooting & FAQ

Q: How can I be sure this kit will fit my specific engine?
A: The best way is to match your engine's original part number to those listed in our "Part Number Cross-Reference" table. Also, carefully check your engine model, horsepower, and year/serial number against the "Compatible Engine Models" tables. For Mercury engines, use the provided serial number guide to be certain.

Q: What are the common signs that my water pump impeller needs to be replaced?
A: Key indicators include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "telltale" outlet port, and a brittle or cracked appearance on the old impeller upon inspection.

Q: How often should I replace my water pump impeller?
A: For preventative maintenance, it is generally recommended to service the water pump and replace the impeller every 1-2 years or every 100-200 hours of operation, especially if you frequently operate in sandy or silty water.

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