Water Pump Impeller Kit – Fits Yamaha 8/9.9HP 4-Stroke Outboard (Replaces 69G-W0078-02-00)
This water pump repair kit is designed for Yamaha 4-stroke outboard engines, specifically 8 HP and 9.9 HP high-thrust models (T8, T9.9) from 2007 and newer. It is also compatible with select F25 (1998-2005, 2009-2010) and C30 (1993-1997) models, ensuring your engine’s cooling system functions correctly.
This kit serves as a direct replacement for Yamaha OEM part numbers 69G-W0078-00-00, 69G-W0078-01-00, and 69G-W0078-02-00. It also cross-references with Sierra 18-3450 and Mallory 9-48613.
- Complete kit includes impeller, cartridge insert, outer plate, seals, and bolts for a full service.
- Engineered to maintain proper cooling system function and prevent overheating.
- Installs in the lower unit with a direct drive connection.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
Brand |
Part Number |
Superseded By |
Yamaha |
69G-W0078-00-00 |
69G-W0078-01-00 |
Yamaha |
69G-W0078-01-00 |
69G-W0078-02-00 |
Yamaha |
69G-W0078-02-00 |
|
Sierra |
18-3450 |
|
Mallory |
9-48613 |
|
Compatible Engine Models
Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.
Brand |
Model |
Rated HP |
Stroke |
Years |
OEM Part No. |
Notes |
Yamaha |
FT8DEPL, FT8DEPX |
8 |
4-Stroke |
2001 |
69G-W0078-02-00 |
High thrust models |
Yamaha |
FT8DMHL |
8 |
4-Stroke |
2003-2004 |
69G-W0078-02-00 |
High thrust model |
Yamaha |
FT9.9GEL, FT9.9GEPL, FT9.9GEX |
9.9 |
4-Stroke |
2008-2012 |
69G-W0078-02-00 |
High thrust models |
Yamaha |
FT9.9LEL, FT9.9LEPL, FT9.9LEX |
9.9 |
4-Stroke |
2013-2017 |
69G-W0078-02-00 |
High thrust models |
Yamaha |
FT9.9LPB, FT9.9XPB |
9.9 |
4-Stroke |
2018+ |
69G-W0078-02-00 |
High thrust models |
Yamaha |
T9.9 |
9.9 |
4-Stroke |
April 2007 and newer |
69G-W0078-02-00 |
High thrust models |
Yamaha |
F25 |
25 |
4-Stroke |
1998-2005, 2009-2010 |
69G-W0078-02-00 |
Additional compatibility |
Yamaha |
C30 |
30 |
4-Stroke |
1993-1997 |
69G-W0078-02-00 |
Additional compatibility |
Technical Specifications
Specification |
Value |
Product Type |
Water Pump Impeller Repair Kit |
Installation |
Lower Unit |
Connection |
Direct Drive |
Other Technical Attributes |
Maintains proper cooling system function |
Package Contents
- 1 x Cartridge Insert (63V-44322-00-00)
- 1 x Impeller (63V-44352-01-00)
- 1 x Woodruff Key (664-44338-00-00)
- 1 x Outer Plate, Cartridge (68T-44323-00-00)
- 1 x Damper, Water Seal (68T-44366-00-00)
- 1 x O-Ring (93210-44704-00)
- 4 x Bolt, Hexagon (97080-08045-00 / 97095-08045-00)
Installation Guide
Disclaimer: This is a general guide. Always consult your service manual for detailed instructions specific to your engine model.
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit mounting bolts and carefully separate the lower unit from the upper casing.
- Locate the water pump housing on top of the lower unit and remove its mounting bolts.
- Slide the housing up and off the driveshaft to expose the impeller. Note the rotational direction of the old impeller's vanes.
- Remove the old impeller, key, gaskets, and wear plate. Clean all mating surfaces thoroughly.
- Install the new cartridge, plates, and woodruff key.
- Slide the new impeller onto the driveshaft while turning the shaft clockwise to seat the vanes correctly inside the housing.
- Apply a light marine-grade grease or soap solution to the new housing and install it over the impeller.
- Secure the housing with the new bolts, tightening them to the torque specified in your service manual.
- Reassemble the lower unit to the engine, ensuring all connections (like the shift shaft and water tube) are properly aligned.
- Reconnect the battery and test the engine on a water supply to confirm proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my Yamaha T9.9?
A: This kit fits Yamaha T9.9 high-thrust models manufactured from April 2007 and newer. The surest way to confirm is to verify that your engine's required OEM part number is 69G-W0078-02-00 or its predecessors (69G-W0078-01-00, 69G-W0078-00-00). You can also use our Yamaha Serial Number Guide to identify your engine.
Q: What are the signs my water pump impeller needs replacing?
A: Common signs of a failing impeller include a weak or no water stream from the "tell-tale" pisser outlet, engine overheating alarms, or finding that the old impeller's vanes are cracked, brittle, or permanently curved during an inspection.
Q: How often should I replace my impeller?
A: For preventative maintenance, we recommend replacing the impeller every 1-2 years or 100-200 hours of use. This interval should be shorter if you frequently operate in saltwater or sandy/silty conditions.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
-
Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
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Fast Global Shipping: Free delivery worldwide in 5–15 days.
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Direct from Manufacturer: Competitive pricing without compromising quality.