Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP (Replaces 853792A07, 361873220)
Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP (Replaces 853792A07, 361873220) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohats...
Product Details
This Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP (Replaces 853792A07, 361873220) is designed for Mercury Marine 25–30 HP 4-Stroke EFI engines (2002+) and a wide range of Tohatsu and Nissan 25–40 HP 2-Stroke (1996–2005) and 25–30 HP 4-Stroke engines (2002–2017). It ensures your engine's cooling system functions efficiently for optimal performance and reliability.
This kit serves as a direct cross-reference for Mercury part numbers 853792A07, 853792A1, and 853792T01, as well as Tohatsu/Nissan equivalents 361-87322-0, 361873220M, and 361873220.
- Engineered for direct OEM replacement fit and function.
- Constructed with durable marine-grade neoprene rubber and stainless steel hardware.
- Components are produced in an ISO9002-certified factory to ensure quality and reliability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 853792A07 |
| Mercury | 853792A1 |
| Mercury | 853792T01 |
| Tohatsu / Nissan | 361-87322-0 |
| Tohatsu / Nissan | 361873220M |
| Tohatsu / Nissan | 361873220 |
| Aftermarket (Impeller) | 345-65021-0 |
| Aftermarket (Impeller) | 47-16154-1 |
| Aftermarket (Impeller) | 161541 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury engines, compatibility is determined by serial number. Please locate your engine's serial number and compare it with the ranges listed.
For Tohatsu & Nissan engines, check your model and year to ensure fitment. Note that specific 4-stroke models from 2002–2017 that use this part are not detailed by name but are confirmed to fit.
| Brand | Model | Rated HP | Stroke | Years / Serial No. | 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 | - |
| 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 | 1996–2002 | 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 | - |
| Tohatsu/Nissan | 4-Stroke Models | 25–30 | 4-Stroke | 2002–2017 | 361-87322-0 | Specific models not detailed |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Housing Material
- Marine-grade Neoprene Rubber Impeller, Non-asbestos Gasket, Stainless Steel Hardware
- Housing Color
- Black (Impeller), Silver (Metal Components)
- Weight
- 130 g (4.6 oz)
- Warranty
- 1-year Manufacturer Warranty (Aftermarket)
- Other Technical Attributes
- Produced in ISO9002-certified factory
What’s in the Box
- 1 x Water Pump Impeller (345-65021-0/47-16154-1/161541)
- 1 x Impeller Key (28-161582/348-65018)
- 1 x Gasket (278-161602/348-65029-1)
- 1 x Gasket (27-161582/348-65018-0)
- 1 x Insert Cup (161572/348-65011-0)
- 1 x Wear Plate (161592/348-65025-0)
- 4 x Bolts & Washers (910103-565)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the gearcase lubricant from the lower unit.
- Remove the bolts securing the lower unit (gearcase) to the engine's upper section and carefully lower it.
- Unbolt and remove the water pump housing to access the impeller and other components.
- Clean all surfaces and inspect for wear or corrosion. Replace the old impeller, gaskets, wear plate, and cup.
- Lightly grease the new impeller and housing interior.
- Reassemble the water pump housing, ensuring all gaskets are aligned correctly. Torque bolts to manufacturer specifications.
- Reinstall the lower unit, refill the gearcase lubricant, and reconnect the battery.
- Start the engine at idle and confirm a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I know this kit fits if my Mercury engine year isn't listed?
For many Mercury engines, fitment is verified by serial number rather than production year. Please check the compatibility table for the correct serial number range for your engine model and horsepower.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent water stream from the tell-tale outlet, engine overheating alerts, or a melted/deformed water pump housing. Proactive replacement is recommended to avoid engine damage.
How often should I replace my water pump impeller?
As a general maintenance rule, it is recommended to inspect and/or replace the water pump impeller every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
My Tohatsu/Nissan is a 4-stroke model; will this kit fit?
Yes, this kit is documented to fit compatible Tohatsu and Nissan 25-30 HP 4-stroke outboards manufactured between 2002 and 2017. While specific model names aren't listed, the part number (361-87322-0) is the correct reference for this range.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs 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 QC.
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