Water Pump Impeller – Fits Yamaha 2HP (Replaces 646-44352-01-00)
Water Pump Impeller – Fits Yamaha 2HP (Replaces 646-44352-01-00) 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 Yamaha 2HP (Replaces 646-44352-01-00)
Water Pump Impeller – Fits Yamaha 2HP (Replaces 646-44352-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This is a high-quality aftermarket Water Pump Impeller – Fits Yamaha 2HP Outboard Engines (Replaces 646-44352-01-00). It is designed for Yamaha 2-Stroke 2HP outboard models including the 2C, 2CMH, and 2DMH series manufactured between 1989 and 2019. Engineered for reliability, this impeller ensures proper water circulation to prevent engine overheating.
This component serves as a direct interchange for Sierra 18-3072, Mallory CEF500324, and GLM 89850, offering a precise fit and restoring cooling system performance.
- Installs as a direct replacement for the OEM part.
- Constructed from durable neoprene rubber for a long service life.
- Also included as a component in Yamaha water pump repair kit 6GD-W0078-00.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 646-44352-01-00 |
| Sierra | 18-3072 |
| Mallory | CEF500324 |
| GLM | 89850 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller is confirmed to fit the following Yamaha 2-stroke outboard engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 2C | 2 | 2-Stroke | 1989–2016 | 646-44352-01-00 | |
| Yamaha | 2CMH | 2 | 2-Stroke | 1989–2016 | 646-44352-01-00 | |
| Yamaha | 2DMH | 2 | 2-Stroke | 2016–2019 | 646-44352-01-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Housing Material
- Neoprene rubber
- Dimensions
- Outside Diameter: 47.5 mm (1.875"), Inside Diameter: 11 mm (0.438"), Height: 13.7 mm
- Other Technical Attributes
- Part of Yamaha water pump repair kit 6GD-W0078-00
What’s in the Box
- 1 x Impeller (646-44352-01-00)
Installation Notes
- Disconnect the spark plug wire and ensure the engine is off.
- Place the gear shift in neutral and remove the bolts securing the lower unit (gearcase).
- Carefully separate the lower unit from the upper engine casing, watching for the shift shaft.
- Locate and unbolt the water pump housing cover.
- Remove the old impeller, taking note of the direction its vanes are bent.
- Clean any debris or corrosion from the inside of the housing and wear plate.
- Install the new impeller by pushing down while turning the driveshaft clockwise to bend the vanes correctly.
- Re-seat the water pump housing and tighten its bolts to the specified torque.
- Reassemble the lower unit to the engine, ensuring the shift shaft, driveshaft, and water tube align correctly before tightening the mounting bolts.
Troubleshooting & FAQ
What are the signs of a failing impeller?
Common symptoms include a weak or non-existent water stream from the tell-tale port, engine overheating alarms, or a noticeable decrease in cooling performance. Visual inspection may reveal cracked, brittle, or missing impeller vanes.
How often should this impeller be replaced?
For preventative maintenance, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).
Can I install this myself?
Yes, impeller replacement is a common maintenance task for those with basic mechanical skills. However, if you are unsure, professional installation is recommended to prevent damage and ensure safety.
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.
