Water Pump Impeller – Fits Yamaha 6-8 HP (Replaces 6G1-44352-00-00, 18-3066)
Water Pump Impeller – Fits Yamaha 6-8 HP (Replaces 6G1-44352-00-00, 18-3066) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller – Fits Yamaha 6-8 HP (Replaces 6G1-44352-00-00,...
Water Pump Impeller – Fits Yamaha 6-8 HP (Replaces 6G1-44352-00-00, 18-3066) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller – Fits Yamaha 6-8 HP Outboards (Replaces 6G1-44352-00-00) is designed for a broad range of Yamaha 2-stroke engines from 1984–2019, covering 6 and 8 HP models. It is also compatible with select early 5 HP units and certain 8 HP high-thrust applications, ensuring reliable cooling system performance.
It serves as a direct replacement for Yamaha part numbers 6G1-44352-00-00, 6G1-44352-01-00, and 6G1-44352-02-00, and interchanges with aftermarket parts including Sierra 18-3066, GLM 89870, CEF 500302, and Mallory 9-45610.
- Installation: Engineered for direct replacement fit.
- Material: Constructed from durable neoprene rubber for marine environments.
- Design: Features a metal-reinforced, notched insert hub for secure seating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6G1-44352-00-00 | 6G1-44352-01-00, 6G1-44352-02-00 |
| Sierra | 18-3066 | |
| GLM | 89870 | |
| CEF | 500302 | |
| Mallory | 9-45610 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please note that while this impeller is common for many 6-8 HP 2-stroke models, certain high-thrust (FT) 4-stroke engines use a different part number. Verify your specific OEM part number before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Various | 6 | 2-Stroke | 1986–2000 | 6G1-44352-00-00 | 2 cylinder models |
| Yamaha | Various | 8 | 2-Stroke | 1984–2019 | 6G1-44352-00-00 | 2 cylinder models |
| Yamaha | FT8 | 8 | 4-Stroke | 2002–2014 | 63V-44352-01-00 | High-thrust models have larger shaft |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Material
- Neoprene Rubber
- Number of Blades
- 6
- Hub Style
- Notched insert, metal reinforced
- Application
- Marine Cooling System
What’s in the Box
- 1 x Impeller (replaces 6G1-44352-00-00)
Installation Notes
- Disconnect the battery and shift the outboard to neutral.
- Locate and unbolt the lower unit (gearcase) from the engine leg.
- Carefully lower the gearcase to access the water pump housing on top of it.
- Remove the bolts securing the water pump housing cover.
- Take note of the rotational direction of the old impeller's blades before pulling it off the driveshaft.
- Clean the housing interior and inspect the wear plate and housing for grooves or corrosion.
- Slide the new impeller onto the drive shaft while turning the shaft clockwise to correctly orient the blades.
- Reassemble the housing, ensuring any seals or gaskets are correctly placed.
- Reinstall the lower unit, carefully aligning the driveshaft, shift shaft, and water tube. Secure all bolts to the specified torque.
- Start the engine in water and verify a steady stream from the cooling system's tell-tale port.
Troubleshooting & FAQ
How do I know if this impeller fits my specific Yamaha model?
This impeller fits many Yamaha 6 HP and 8 HP 2-stroke outboards from 1984–2019. It also fits certain early 5 HP models and high-thrust (FT8) 4-stroke models, which may have a different OEM part number. Always cross-reference your engine's original part number with the numbers in our Part Number Matrix and check the compatibility table.
What are the signs of a failing water pump impeller?
Common signs include the engine overheating, a weak or non-existent water stream from the "telltale" outlet, and a dry, cracked, or brittle appearance of the old impeller upon inspection. You may also hear a whining sound from the lower unit.
How often should the water pump impeller be replaced?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater, sandy/silty water).
Can I install this myself?
Yes, many boat owners with basic mechanical skills can perform the replacement. However, it involves removing the lower unit. If you are not comfortable with this process or lack the proper tools, professional installation is recommended to prevent damage.
What's the difference between this and the original OEM part?
This is an aftermarket part designed to meet or exceed OEM specifications. It's made from high-quality neoprene rubber, similar to the original, offering a reliable and cost-effective alternative. It ensures proper fit and function for effective engine cooling.
What is an OEM part vs. an aftermarket part?
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.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty & return policy?
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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