Water Pump Impeller – Fits Yamaha 40-70 HP Outboards (Replaces Yamaha 6H3-44352-00-00, 697-44352-00-00, Sierra 18-3069)
Water Pump Impeller – Fits Yamaha 40-70 HP Outboards (Replaces Yamaha 6H3-44352-00-00, 697-44352-00-00, Sierra 18-3069) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Impeller – Fits Yamaha 40-70 HP Outboards (Replaces Yama...
Water Pump Impeller – Fits Yamaha 40-70 HP Outboards (Replaces Yamaha 6H3-44352-00-00, 697-44352-00-00, Sierra 18-3069) is backordered and will ship as soon as it is back in stock.
Product Details
This is a replacement Water Pump Impeller – Fits Yamaha 40-70 HP Outboards, designed for a wide range of Yamaha 2-stroke and 4-stroke engines from approximately 1984 to 2019. It is compatible with C-series, F-series, P-series, and T-series models within the 40 to 70 horsepower range, ensuring broad application for many common marine engines.
This component serves as a direct replacement for Yamaha part numbers 6H3-44352-00-00, 6H3-44352-01-00, and Sierra 18-3069. It also supersedes the older Yamaha part 697-44352-00-00.
- Easy to install with standard hand tools.
- Made from durable, high-quality neoprene rubber for marine environments.
- Self-priming design uses the pumped fluid for lubrication during operation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 697-44352-00-00 | 6H3-44352-00-00 |
| Yamaha | 6H3-44352-00-00 / 6H3-44352-01-00 | |
| Sierra | 18-3069 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40 | 40 | 2-Stroke & 4-Stroke | 1997–2019 | 6H3-44352-00-00 | F40 model included |
| Yamaha | 50 | 50 | 2-Stroke & 4-Stroke | 1997–2019 | 6H3-44352-00-00 | F50 model included |
| Yamaha | 60 | 60 | 2-Stroke & 4-Stroke | 1997–2019 | 6H3-44352-00-00 | C60, P60, F60 models included |
| Yamaha | 70 | 70 | 2-Stroke & 4-Stroke | 1997–2019 | 6H3-44352-00-00 | C70, F70 models included |
| Yamaha | T50 | 50 | 4-Stroke | 1997–2005 | 6H3-44352-00-00 | High-thrust model |
| Yamaha | T60 | 60 | 4-Stroke | 2003–2005 | 6H3-44352-00-00 | High-thrust model |
Technical Specs
- Product Type
- Outboard Water Pump Impeller
- Installation
- Direct replacement, hand tool installation
- Material
- Neoprene rubber
- Color
- Black
- Dimensions
- External diameter: 58mm (2.28 inch), Height: 29mm (1.14 inch)
- Internal Shaft Diameter
- 20mm (0.79 inch)
- Number of Blades
- 6
- Other Technical Attributes
- Self-priming design, uses pumped fluid for lubrication
What’s in the Box
- 1 x Water Pump Impeller (6H3-44352-00-00)
Installation Notes
- Disconnect the battery and shift linkage before beginning work.
- Unbolt and carefully lower the gearcase to access the water pump assembly.
- Remove the water pump housing bolts and slide the housing up the driveshaft.
- Inspect the housing and wear plate for scoring or damage; replace if necessary.
- Note the rotational direction of the old impeller vanes before removing it and its key.
- Clean all mating surfaces of old gasket material and debris.
- Slide the new impeller key into the driveshaft slot.
- Install the new impeller by sliding it down the shaft while turning the shaft clockwise to bed the vanes correctly.
- Reassemble the water pump housing and install new gaskets.
- Reinstall the lower unit, reconnect linkages, and secure the battery.
- Start the engine in water and confirm a steady, strong stream from the water pump indicator (tell-tale).
Troubleshooting & FAQ
How do I know if my impeller needs replacing?
Common signs of a failing impeller include an engine that overheats at idle or low speeds, a weak or inconsistent water stream from the "tell-tale" port, or finding brittle, cracked, or deformed vanes on the old impeller during an inspection. Preventative replacement every 1-2 seasons is recommended.
The vanes on the new impeller are straight, but my old one's were curved. Is it defective?
No, this is normal. New impellers have flexible, straight vanes. They will curve into the correct orientation once installed inside the water pump housing and the driveshaft is turned clockwise during installation.
Do I need to lubricate the new impeller during installation?
Yes, it's highly recommended to apply a light coat of marine grease or soapy water to the interior of the pump housing and onto the new impeller. This prevents damage during the first few dry rotations on initial startup.
Does this part include gaskets or the housing?
This listing is for the water pump impeller only. It does not include gaskets, O-rings, wear plates, or the pump housing. Check the "What's in the Box" section for a complete list of included items.
Is this an OEM or aftermarket part?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If an issue arises, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition.
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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