Water Pump Impeller – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65021-1, 47-16154-3)
Water Pump Impeller – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65021-1, 47-16154-3) 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 – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65...
Product Details
This high-quality Water Pump Impeller – Fits Tohatsu/Nissan 2.5-6 HP (Replaces 369-65021-1) is an essential component for maintaining your engine’s cooling system. It is designed for a broad range of Tohatsu/Nissan 2-stroke and 4-stroke outboard engines from 2.5 to 6 HP (1992–present) and also fits various Mercury/Mariner 4–5 HP 2-stroke and 2.5–6 HP 4-stroke models.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Tohatsu 369-65021-1, Mercury/Mariner 47-16154-3, Sierra 18-3098, CEF 500377, and Mallory 9-45302.
- Engineered for direct-fit installation, replacing the OEM component without modification.
- Constructed from durable neoprene rubber with a robust nylon hub for longevity.
- Features a 6-blade design for efficient water flow and optimal cooling performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Tohatsu | 369-65021-1, 369650211 |
| Mercury/Mariner | 47-16154-3 |
| Sierra | 18-3098 |
| CEF | 500377 |
| Mallory | 9-45302 |
Engine & Model Compatibility
Confirm your engine model and year in the tables below to ensure proper fitment.
Tohatsu/Nissan Models: This impeller fits a wide array of small-horsepower 2-stroke and 4-stroke outboards from 2003 to the present.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Tohatsu | M2.5A2 | 2.5 | 2-Stroke | 2003 & Up | 369-65021-1 |
| Tohatsu | M3.5A2, M3.5B2 | 3.5 | 2-Stroke | 2003 & Up | 369-65021-1 |
| Tohatsu | M4C | 4 | 2-Stroke | Various | 369-65021-1 |
| Tohatsu | M5B, M5BS | 5 | 2-Stroke | Various | 369-65021-1 |
| Tohatsu | MFS2A, MFS2B | 2.5 | 4-Stroke | 2006 & Up | 369-65021-1 |
| Tohatsu | MFS2.5A, MFS2.5B | 2.5 | 4-Stroke | 2006 & Up | 369-65021-1 |
| Tohatsu | MFS3.5A, MFS3.5B | 3.5 | 4-Stroke | 2006 & Up | 369-65021-1 |
| Tohatsu | MFS4A2, MFS4B, MFS4C | 4 | 4-Stroke | S/N 12183 & Up | 369-65021-1 |
| Tohatsu | MFS5A2, MFS5B, MFS5C | 5 | 4-Stroke | S/N 19757 & Up | 369-65021-1 |
| Tohatsu | MFS6A2, MFS6B, MFS6C | 6 | 4-Stroke | S/N 01751 & Up | 369-65021-1 |
| Nissan | NS2.5A2 | 2.5 | 2-Stroke | 2003 & Up | 369-65021-1 |
| Nissan | NS3.5A2, NS3.5B2 | 3.5 | 2-Stroke | 2003 & Up | 369-65021-1 |
| Nissan | NSF2.5A | 2.5 | 4-Stroke | 2006 & Up | 369-65021-1 |
| Nissan | NSF3.5A | 3.5 | 4-Stroke | 2006 & Up | 369-65021-1 |
| Nissan | NSF4A, NSF4B | 4 | 4-Stroke | Various | 369-65021-1 |
| Nissan | NSF5A, NSF5B | 5 | 4-Stroke | Various | 369-65021-1 |
| Nissan | NSF6A2, NSF6B | 6 | 4-Stroke | Various | 369-65021-1 |
Mercury/Mariner Models: Compatibility extends to various 2-stroke and 4-stroke models, often distinguished by serial number range.
| Brand | Model | Rated HP | Stroke | Years / S/N | OEM Part No. |
|---|---|---|---|---|---|
| Mercury/Mariner | 4HP | 4 | 2-Stroke | 0G710613-0T894438, 0P017000-0P400999 | 47-16154-3 |
| Mercury/Mariner | 4HP | 4 | 2-Stroke | 0T894439 & Up, 0P401000 & Up | 47-16154-3 |
| Mercury/Mariner | 5HP | 5 | 2-Stroke | 0G710613-0T894438, 0P017000-0P400999 | 47-16154-3 |
| Mercury/Mariner | 5HP | 5 | 2-Stroke | 0T894439 & Up, 0P401000 & Up | 47-16154-3 |
| Mercury/Mariner | 2HP, 2.5HP, 3.5HP | 2-3.5 | 4-Stroke | 0R131842 & Up | 47-16154-3 |
| Mercury/Mariner | 4, 5, 6HP | 4-6 | 4-Stroke | 0R000001-0R067089, 0P073456-0P400999 | 47-16154-3 |
| Mercury/Mariner | 4, 5, 6HP | 4-6 | 4-Stroke | 0R067090 & Up, 0P401000 & Up | 47-16154-3 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement for OEM component
- Number of Blades
- 6
- Housing Material
- Neoprene rubber with nylon hub
- Dimensions
- Height: 14.30mm (0.56"), External Diameter: 33.58mm (1.32"), Hub Diameter: 10.25mm (0.40")
- Weight
- 6–7g (0.21–0.25 oz)
What’s in the Box
- 1 x Water Pump Impeller (Replaces 369-65021-1)
Installation Notes
- Disconnect the battery and spark plug wire(s) for safety.
- Place the outboard in neutral and remove the bolts securing the lower unit (gearcase).
- Carefully separate the lower unit from the upper housing, watching for the shift shaft.
- Unbolt and remove the water pump housing cover to access the impeller.
- Remove the old impeller, noting the rotational direction of the blades. Clean any debris from the housing.
- Lubricate the new impeller and housing with marine grease. Install the new impeller by rotating the driveshaft in the direction of engine operation.
- Reinstall the water pump housing, gaskets, and bolts, torquing to manufacturer specifications.
- Reassemble the lower unit to the engine, ensuring all shafts align. Test the engine cooling system using a water supply before open water use.
Troubleshooting & FAQ
How do I know if my impeller is failing?
Common signs of a worn or damaged impeller include a weak or non-existent water stream from the engine's tell-tale port, engine overheating alarms, or visible cracks and missing blades upon inspection.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).
Will this fit if my exact serial number isn't listed?
The models and serial numbers provided cover the most common applications. If your model is listed but the serial number differs, please inspect your old impeller and compare its dimensions to our technical specs to confirm fitment.
What is the difference between this impeller and the OEM version?
Our aftermarket impeller is designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, material, and performance. It offers a cost-effective solution without compromising on quality or cooling efficiency.
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 and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not proceed with the order.
- This is an aftermarket replacement and not an OEM component. All references to brand names and part numbers are for identification purposes only.
- Professional installation is highly recommended to ensure safety, proper function, and to prevent damage to your engine.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — Free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By removing middlemen, we deliver fair pricing without compromising on materials or quality control.
Payment & Security
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