Water Pump Impeller – Fits Tohatsu & Nissan 25-30 HP 2-Stroke Outboards (Replaces 345-65021-0)
Water Pump Impeller – Fits Tohatsu & Nissan 25-30 HP 2-Stroke Outboards (Replaces 345-65021-0) 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 – Fits Tohatsu & Nissan 25-30 HP 2-Stroke O...
Water Pump Impeller – Fits Tohatsu & Nissan 25-30 HP 2-Stroke Outboards (Replaces 345-65021-0) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Tohatsu & Nissan 25-30 HP 2-Stroke Outboards is an essential aftermarket component designed to ensure your engine maintains optimal operating temperature. It is engineered to fit a range of Tohatsu and Nissan 25-30 HP 2-stroke outboard motors, serving as a critical part of the cooling system.
This part serves as a direct interchange for Tohatsu 345-65021-0/345650210M, Nissan 345-65021-0/345650210M, Sierra 18-8923, and Full Power Plus 345-65021-0.
- Engineered for direct OEM replacement installation.
- Constructed from durable, high-quality neoprene for reliable performance.
- Includes one water pump impeller as shown in the package contents.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu | 345-65021-0 / 345650210M / 3R0650210M |
| Nissan | 345-65021-0 / 345650210M |
| Sierra | 18-8923 |
| Full Power Plus | 345-65021-0 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits various 2-stroke outboards under the Tohatsu brand, primarily in the 25-30 HP range.
Fits various 2-stroke outboards under the Nissan brand, primarily in the 25-30 HP range.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Tohatsu | M25C2 | 25 | 2-Stroke | 345-65021-0/345650210M | |
| Tohatsu | M25C3 | 25 | 2-Stroke | 345-65021-0/345650210M | |
| Tohatsu | M30A3 | 30 | 2-Stroke | 345-65021-0/345650210M | |
| Tohatsu | M30A4 | 30 | 2-Stroke | 345-65021-0/345650210M | |
| Tohatsu | M35C | 35 | 2-Stroke | 345-65021-0/345650210M | Some sources include 35HP |
| Tohatsu | M40C | 40 | 2-Stroke | 345-65021-0/345650210M | Some sources include 40HP |
| Nissan | NS25C2 | 25 | 2-Stroke | 345-65021-0/345650210M | |
| Nissan | NS25C3 | 25 | 2-Stroke | 345-65021-0/345650210M | |
| Nissan | NS30A3 | 30 | 2-Stroke | 345-65021-0/345650210M | |
| Nissan | NS30A4 | 30 | 2-Stroke | 345-65021-0/345650210M | |
| Nissan | NS35C | 35 | 2-Stroke | 345-65021-0/345650210M | Some sources include 35HP |
| Nissan | NS40C | 40 | 2-Stroke | 345-65021-0/345650210M | Some sources include 40HP |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Material
- Neoprene
- Number of Blades
- 6
- Inner Diameter
- 17 mm
- Outer Diameter
- 44 mm
- Blade Width
- 20 mm
- Color
- Black
What’s in the Box
- 1 x Water Pump Impeller (345-65021-0/345650210M/3R0650210M)
Installation Notes
- Always disconnect the battery and allow the engine to cool completely before starting work.
- Access the lower unit of the outboard and drain the gearcase oil.
- Unbolt and remove the lower unit from the engine's driveshaft housing.
- Locate and unbolt the water pump housing to expose the impeller.
- Note the orientation of the old impeller blades before carefully removing the impeller and its key.
- Clean the inside of the housing and inspect it for wear, cracks, or corrosion. Replace if damaged.
- Install the new key and slide the new impeller into place, rotating the driveshaft to seat the blades correctly.
- Re-install the water pump housing with new gaskets (if applicable) and torque bolts to manufacturer specifications.
- Re-assemble the lower unit, refill the gearcase oil, and re-attach all components.
- Once assembled, test the engine using a water supply to ensure proper water circulation.
Troubleshooting & FAQ
How do I confirm this impeller fits my specific engine?
The best method is to match your existing OEM part number to one of the cross-reference numbers listed in our Part Number Matrix. Additionally, check your engine model against our compatibility table. When in doubt, compare the dimensions and photos to your old part before ordering.
Does this fit the 35 HP and 40 HP models listed?
Some sources indicate compatibility with select Tohatsu/Nissan 35 HP and 40 HP models (like the M35C, M40C, NS35C, NS40C). However, primary fitment is for 25-30 HP engines. We strongly recommend you verify the part number or dimensions from your engine's service manual or existing part before purchasing for a 35/40 HP model.
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 stream of water from the "telltale" outlet, and in some cases, a high engine temperature alarm. A brittle, cracked, or worn-down impeller cannot pump water effectively.
How often should I replace the impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage (hours) and operating conditions (saltwater vs. freshwater). Frequent use in sandy or silty water may require more frequent replacement.
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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