Water Pump Impeller – Fits Yamaha 6HP/8HP/9.9HP 4-Stroke (Replaces 68T-44352-00-00, 18-3040, 8M6010335)
Water Pump Impeller – Fits Yamaha 6HP/8HP/9.9HP 4-Stroke (Replaces 68T-44352-00-00, 18-3040, 8M6010335) 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 Yamaha 6HP/8HP/9.9HP 4-Stroke (Replaces ...
Water Pump Impeller – Fits Yamaha 6HP/8HP/9.9HP 4-Stroke (Replaces 68T-44352-00-00, 18-3040, 8M6010335) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Water Pump Impeller – Fits Yamaha 6HP/8HP/9.9HP 4-Stroke Outboard Engines (Replaces 68T-44352-00-00) is engineered to restore cooling performance in your outboard. It is designed for a precise fit on select Yamaha 4-Stroke outboard engines, including F6, F8, F9.9, and T8 models manufactured between 2001 and 2014.
It serves as a direct replacement for Yamaha part number 68T-44352-00-00 and interchanges with aftermarket parts including Sierra 18-3040 and Quicksilver 8M6010335.
- Installs directly into the lower unit water pump assembly.
- Constructed from durable, marine-grade neoprene/rubber for longevity.
- Requires the correct Woodruff key for proper, slip-free operation on the driveshaft.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 68T-44352-00-00 | OEM Reference |
| Sierra | 18-3040 | Aftermarket Interchange |
| Quicksilver | 8M6010335 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller is compatible with a range of Yamaha 4-Stroke outboards, including standard and high-thrust (T8) models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F6 | 6 | 4-Stroke | 2001–2008 | 68T-44352-00-00 | |
| Yamaha | F6 | 6 | 4-Stroke | 2009–2011 | 68T-44352-00-00 | |
| Yamaha | F8 | 8 | 4-Stroke | 2001–2011 | 68T-44352-00-00 | |
| Yamaha | T8 | 8 | 4-Stroke | 2001–2010 | 68T-44352-00-00 | High thrust version |
| Yamaha | F9.9 | 9.9 | 4-Stroke | 2001–2014 | 68T-44352-00-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement in lower unit water pump assembly
- Material
- Neoprene/Rubber
- Compatibility
- Yamaha 4-Stroke 6HP, 8HP, 9.9HP outboard engines
- Other Technical Attributes
- Must be installed with proper Woodruff key for proper operation
What’s in the Box
- 1 x Impeller (68T-44352-00-00)
Installation Notes
- Disconnect the battery and remove the propeller.
- Drain the gearcase oil from the lower unit.
- Unbolt and carefully separate the lower unit from the engine’s upper housing.
- Locate and unbolt the water pump housing cover.
- Note the rotational direction of the old impeller vanes before removing it from the driveshaft.
- Remove the old impeller and Woodruff key. Clean and inspect the pump housing and wear plate for scoring or damage.
- Install the new Woodruff key onto the flat spot on the driveshaft.
- Slide the new impeller onto the shaft while turning the driveshaft clockwise to correctly bend the vanes inside the housing.
- Reassemble the water pump housing, ensuring a proper seal.
- Reattach the lower unit to the engine, refill with fresh gear lube, and reinstall the propeller.
- Before boating, test the engine in a barrel of water or with a flush attachment to verify strong water flow from the tell-tale port.
Troubleshooting & FAQ
How do I confirm this impeller is correct for my Yamaha outboard?
Verify your engine's model, horsepower, and year fall within the ranges listed in the Engine & Model Compatibility table. Cross-reference the OEM part number (68T-44352-00-00) with your service manual or current part to ensure an exact match.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or absent water stream from the "tell-tale" outlet, engine overheating alerts or alarms, and a reduction in overall engine performance. A visual inspection may show cracked, brittle, or worn-down impeller vanes.
What is the recommended replacement interval for an impeller?
For preventative maintenance, it is best practice to replace the impeller every 1 to 2 years or every 100-200 hours of operation, whichever comes first. This schedule can vary based on usage conditions (e.g., saltwater vs. freshwater, sandy or silty water).
Why is the Woodruff key so important for installation?
The Woodruff key is a small, semi-circular piece of metal that locks the impeller to the driveshaft, preventing it from spinning freely. Without it, the driveshaft will rotate, but the impeller will not, resulting in a complete loss of water circulation and causing the engine to overheat almost immediately.
Does this part include the full water pump repair kit?
No, this listing is for the flexible neoprene impeller only. It does not include the water pump housing, gaskets, face plate, or Woodruff key. These components should be inspected during installation and replaced if they show signs of wear, corrosion, or damage.
Is it safe to reuse my old water pump gaskets?
It is strongly recommended to use new gaskets during a water pump service. Old gaskets can become brittle and compressed, leading to a poor seal that can cause water leaks into the gearcase or air leaks that reduce pump 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/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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