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) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 25–40 HP 2-Str...
Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 25–40 HP 2-Stroke (Replaces 361-87322-0) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit is designed for specified Tohatsu and Nissan 25–40 HP 2-stroke outboard engines from the model and year ranges listed below. It also fits select Mercury 25–30 HP 4-stroke EFI engines when the engine model and serial-number conditions in the compatibility table are met.
The kit is an aftermarket replacement for Tohatsu/Nissan part number 361-87322-0 and includes the impeller, drive key, wear plate, cup liner, gaskets, bolts, and washers listed in the package contents.
- Direct-fit aftermarket replacement
- Components for servicing the water pump assembly
- Covered by a 1-year manufacturer warranty
Part Number Matrix
Use the following references to compare the applicable OEM and interchange numbers for your engine.
| Brand | Part Number |
|---|---|
| Tohatsu/Nissan | 361-87322-0 |
| Tohatsu/Nissan | 361873220 |
| Tohatsu/Nissan | 361873220M |
| Mercury | 853792A1 |
| Mercury | 853792T01 |
| Mercury | 853792A07 |
Engine & Model Compatibility
Confirm the exact engine brand, model, rated horsepower, stroke, year, and serial-number condition before ordering. Compatibility conditions must be considered together.
Tohatsu & Nissan 2-Stroke Applications
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Tohatsu | M25C2 | 25 | 2-Stroke | 1996–2005 | 361-87322-0 |
| Tohatsu | M25C3 | 25 | 2-Stroke | 2002–2005 | 361-87322-0 |
| Tohatsu | M30A3 | 30 | 2-Stroke | 1996–2002 | 361-87322-0 |
| Tohatsu | M30A4 | 30 | 2-Stroke | 2002–2005 | 361-87322-0 |
| Tohatsu | M35C | 35 | 2-Stroke | 2002 | 361-87322-0 |
| Tohatsu | M40C | 40 | 2-Stroke | 1996–2004 | 361-87322-0 |
| Nissan | NS25C2 | 25 | 2-Stroke | 1996–2005 | 361-87322-0 |
| Nissan | NS25C3 | 25 | 2-Stroke | 2002–2005 | 361-87322-0 |
| Nissan | NS30A3 | 30 | 2-Stroke | 1996–2002 | 361-87322-0 |
| Nissan | NS30A4 | 30 | 2-Stroke | 2002–2005 | 361-87322-0 |
| Nissan | NS35C | 35 | 2-Stroke | 2002 | 361-87322-0 |
| Nissan | NS40C | 40 | 2-Stroke | 1996–2004 | 361-87322-0 |
| Nissan | NS40C2 | 40 | 2-Stroke | 2002–2004 | 361-87322-0 |
Mercury Marine 4-Stroke EFI Applications
The Mercury applications below require the listed serial-number range. Do not rely on horsepower alone when checking fitment.
| Brand | Model | Rated HP | Stroke | Serial Number | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | Sea Pro | 25 | 4-Stroke | 0R051710 and up | 853792A07 |
| Mercury | EFI Standard | 25 | 4-Stroke | 0R106999 and up | 853792A07 |
| Mercury | EFI JET | 25 | 4-Stroke | 0R165086 and up | 853792A07 |
| Mercury | EFI Standard | 30 | 4-Stroke | 0R106999 and up | 853792A07 |
Technical Specs
- Product Type
- Water pump impeller repair kit
- Application
- Outboard water pump service
- Installation
- Direct-fit aftermarket replacement
- Fuel Type
- Gasoline
- Material
- Marine-grade replacement materials
- Warranty
- 1 year
- Manufacturing Standard
- Produced in an ISO 9002 certified factory
What’s in the Box
- 1 × Water pump impeller (345-65021-0 / 47-161541)
- 1 × Driveshaft key (332-65022-0)
- 1 × Stainless-steel wear plate (348-65025-0)
- 1 × Stainless-steel cup liner (348-65011-0)
- 1 × Gasket set
- 4 × Bolts with washers
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower-unit gear lubricant.
- Remove the lower unit from the outboard.
- Unbolt and remove the existing water-pump housing.
- Inspect the housing and clean all mating surfaces.
- Install the impeller, gaskets, wear plate, and cup liner supplied with the kit. Make sure the driveshaft key is correctly seated.
- Reassemble the water-pump housing and torque the bolts to the engine manufacturer’s specifications.
- Reinstall the lower unit and refill it with the correct gear lubricant.
- Reconnect the battery and test the cooling system, confirming a steady tell-tale stream.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Compare your engine brand, exact model, horsepower, stroke, year, and serial number with the tables above. Also compare the original water-pump part number. Mercury applications require particular attention to the listed serial-number range.
What are the signs of a failing water-pump impeller?
Common signs include overheating at idle or low speed, a weak or missing tell-tale stream, and a dry, cracked, or brittle impeller. A worn housing or wear plate can also reduce water-pump performance.
How often should the water pump be serviced?
As a preventative-maintenance guideline, inspect and replace the impeller and gaskets every 1–2 years or every 100–200 hours of use. Service may be needed sooner in saltwater or sandy and silty conditions.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit, not an OEM component. The listed OEM and interchange numbers are provided only for reference and fitment comparison.
What are the shipping and warranty terms?
Typical transit is 5–15 days, with standard shipping free to most regions. Expedited options may be available at checkout. The product includes a 1-year warranty against manufacturing defects under normal use. Returns are accepted according to the applicable return policy when the item is unused and in its original condition.
Safety & Important Information
- Verify the exact engine model, year, stroke, horsepower, serial number, and original part number before ordering.
- Do not operate an outboard with an overheating engine or an inadequate tell-tale stream.
- This is an aftermarket replacement kit, not an OEM component.
- Professional installation is recommended when you are not familiar with lower-unit removal or water-pump service.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered for dependable real-world service.
- Fast Global Fulfillment — Free standard delivery is available to most regions, with typical transit of 5–15 days.
- Manufacturer-Direct Value — Fair pricing supported by consistent materials and quality-control processes.
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