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
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 – Fits Tohatsu/Nissan 25–40 HP 2-Stroke (Replaces 361-87322-0) is designed for Tohatsu and Nissan 25–40 HP 2-stroke outboard engines (1996–2005) and select Mercury 25–30 HP 4-Stroke EFI engines from 2002 and later (serial numbers 0R051710 and up). It contains all the necessary components for a complete water pump service.
It serves as a direct aftermarket replacement for Tohatsu/Nissan part number 361-87322-0 and Mercury interchange 853792A1, among other equivalents.
- Direct OEM replacement installation
- Includes all components for a complete water pump service
- Covered by a 1-year manufacturer warranty
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu/Nissan | 361-87322-0 |
| Tohatsu/Nissan | 361873220 |
| Tohatsu/Nissan | 361873220M |
| Mercury | 853792A1 |
| Mercury | 853792T01 |
| Mercury | 853792A07 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Tohatsu & Nissan engines, this kit is compatible with the 2-stroke models listed below from 1996 through 2005.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| 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 |
For Mercury Marine engines, this kit is compatible with specific 4-stroke EFI models from 2002 and later, identified by serial number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Sea Pro | 25 | 4-Stroke | 0R051710 & Up | 853792A07 | |
| Mercury | EFI Standard | 25 | 4-Stroke | 0R106999 & Up | 853792A07 | |
| Mercury | EFI JET | 25 | 4-Stroke | 0R165086 & Up | 853792A07 | |
| Mercury | EFI Standard | 30 | 4-Stroke | 0R106999 & Up | 853792A07 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Housing Material
- Marine-grade Materials (OEM Specification)
- Warranty
- 1 Year
- Manufacturing Standard
- Produced in an ISO9002 certified factory
What’s in the Box
- 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 Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower unit gear lube.
- Remove the lower unit from the outboard motor.
- Unbolt and remove the old water pump housing.
- Carefully inspect the housing and clean all mating surfaces.
- Install the new impeller, gaskets, wear plate, and cup liner from the kit. Ensure the impeller driveshaft key is correctly seated.
- Reassemble the water pump housing, torquing bolts to manufacturer specifications.
- Reinstall the lower unit and refill with fresh gear lube.
- Reconnect the battery and test the engine in the water to verify proper cooling system function via the tell-tale stream.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
This kit fits specific Tohatsu/Nissan 25–40 HP 2-stroke outboards (1996–2005) and select Mercury 25-30 HP 4-stroke models (2002+). Always cross-reference your engine model and OEM part number with our compatibility tables. For Mercury engines, confirming the serial number range is critical for a correct match.
What are the signs of a failing water pump impeller?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent "telltale" water stream, or finding a dry, cracked, or brittle impeller upon inspection. A damaged housing or wear plate can also cause poor performance.
How often should the water pump be serviced?
As a preventative maintenance guideline, we recommend inspecting and replacing the impeller and gaskets every 1-2 years or every 100-200 hours of use. This interval may be shorter in saltwater or silty/sandy conditions.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency and quality.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions; expedited options will appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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