Water Pump Impeller – Fits Tohatsu/Nissan 45-70HP (Replaces 353-65021-0, 353650210M, 18-45404)
Water Pump Impeller – Fits Tohatsu/Nissan 45-70HP (Replaces 353-65021-0, 353650210M, 18-45404) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller – Fits Tohatsu/Nissan 45-70HP (Replaces 353-650...
Water Pump Impeller – Fits Tohatsu/Nissan 45-70HP (Replaces 353-65021-0, 353650210M, 18-45404) is backordered and will ship as soon as it is back in stock.
Product Details
This marine Water Pump Impeller – Fits Tohatsu/Nissan Outboard 50-70HP (Replaces 353-65021-0, 353650210M) is an aftermarket part for Tohatsu and Nissan 2-stroke outboard engines in the 45-70HP range, specifically models from the 45A, 50, 55B, and 70A2 series.
It serves as a direct interchange for Tohatsu 353-65021-0 / 353650210M, Nissan 353-65021-0 / 353650210M, and Sierra 18-45404.
- Engineered for direct OEM replacement installation.
- Designed for reliable performance in both saltwater and freshwater.
- Constructed from durable, high-performance neoprene with 6 blades.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu | 353-65021-0 |
| Tohatsu | 353650210M |
| Nissan | 353-65021-0 |
| Nissan | 353650210M |
| Sierra | 18-45404 |
Engine & Model Compatibility
Confirm your engine model in the table below. Because precise year ranges are not always available, verifying the OEM part number is critical.
This impeller fits select Tohatsu 2-stroke outboards from 45 HP to 70 HP.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Tohatsu | M45A2 | 45 | 2-Stroke | 353-65021-0 |
| Tohatsu | M50C | 50 | 2-Stroke | 353-65021-0 |
| Tohatsu | M60A | 60 | 2-Stroke | 353-65021-0 |
| Tohatsu | M70A2 | 70 | 2-Stroke | 353-65021-0 |
This part is also compatible with specific Nissan 2-stroke models in the 45 HP to 70 HP range.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Nissan | NS45A2 | 45 | 2-Stroke | 353-65021-0 |
| Nissan | NS50C | 50 | 2-Stroke | 353-65021-0 |
| Nissan | NS60A | 60 | 2-Stroke | 353-65021-0 |
| Nissan | NS70A2 | 70 | 2-Stroke | 353-65021-0 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Number of Blades
- 6
- Hub Type
- Plastic
- Material
- Neoprene
- Internal Shaft Insert Diameter
- 17.20mm (43/64")
- Height
- 23.80mm (15/16")
- External Impeller Overall Diameter
- 60.84mm (2 25/64")
- Environment
- Designed for saltwater/freshwater use
What’s in the Box
- 1 x Water Pump Impeller (Replaces 353-65021-0 / 353650210M)
Installation Notes
- Disconnect the battery and shift linkage before starting.
- Unbolt and carefully lower the gearcase/lower unit from the outboard.
- Locate and unbolt the water pump housing (typically 4-6 bolts).
- Remove the old impeller, noting the direction of the blades. Also remove the old gaskets and wear plate.
- Thoroughly clean the inside of the pump housing and inspect for scoring or corrosion.
- Install the new gasket(s), drive key, and impeller. You can use a light coat of marine grease or soap/water solution inside the housing to help seat the new impeller.
- Turn the driveshaft clockwise while pushing down on the pump housing to correctly orient the impeller blades.
- Tighten the housing bolts to the manufacturer's specified torque.
- Reinstall the lower unit, reconnect the shift linkage, and secure all bolts.
- Connect a water supply (flushing muffs or test tank) and start the engine to verify strong water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if my impeller is failing?
Common signs of a bad impeller include a weak or intermittent water stream from the engine's tell-tale outlet, an engine overheating alarm, or visible damage such as cracked, brittle, or missing blades upon physical inspection.
How often should I replace my impeller?
As a preventative maintenance best practice, inspect your impeller annually and plan to replace it every 1-2 years or 100-200 hours of use, whichever comes first. More frequent changes may be necessary if you operate in sandy, silty, or saltwater conditions.
Will this fit my exact engine model and year?
This impeller fits a range of Tohatsu and Nissan models as detailed in the compatibility tables. Since manufacturers may not provide year ranges for all parts, it is critical to verify the OEM part number (353-65021-0) and compare the dimensions against your existing part before ordering.
Is lubricant required for installation?
Yes, apply a light coat of 2-4-C marine grease or a simple soap and water solution to the interior of the pump housing and the impeller itself. This lubricates the blades, prevents damage during the first dry start-up, and makes installation easier.
What is the difference between a plastic hub and a metal hub?
Both hub types perform well. Plastic hubs are common in modern impellers as they are inherently corrosion-resistant and can act as a fail-safe by breaking away if the pump seizes, potentially protecting the engine's gearcase. This impeller features a durable plastic hub.
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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
