Yamaha Water Pump Repair Kit 682-W0078-A3-00
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The Yamaha 682-W0078-A3-00 Water Pump Repair Kit is an OEM Yamaha seawater pump service kit for select Yamaha F9.9, T9.9, and FT9.9 4-stroke outboards. It includes the core pump wear parts needed for routine water pump service, helping maintain proper cooling-water flow and reduce the risk of overheating. This kit supersedes earlier Yamaha reference 682-W0078-A2-00 in supported applications.
Key Features
- Genuine Yamaha water pump repair kit
- Part number: 682-W0078-A3-00
- Designed for select Yamaha F9.9 / T9.9 / FT9.9 4-stroke outboards
- Helps restore cooling-water flow through the lower-unit water pump
- Includes impeller, gaskets, cartridge insert, outer plate, water seal damper, bolts, and Woodruff key
- Supersedes 682-W0078-A2-00
- Suitable for scheduled 20 / 100 / 300 / 500 hour cooling-system maintenance where specified by the Yamaha service schedule.
Engine Compatibility
This kit is listed for Yamaha F9.9, T9.9, and FT9.9 4-stroke outboards, including FT9.9 through 1996, plus F9.9 / T9.9 / FT9.9 2004 through April 2005 applications where the matching pump assembly is used. Application references also associate it with F9.9 1997–2005 6G8-model listings depending on model year and serial range.
Serial Number Fitment Notice
Water pump kit fitment depends on the exact Yamaha outboard model, model year, shaft length, lower-unit water pump assembly, and serial number range. Always confirm compatibility using the Yamaha model code and serial number before ordering, especially when comparing 682-W0078-A3-00 with earlier or nearby Yamaha water pump kits.
When This Part Needs Replacement
Replace the water pump kit during scheduled water pump service, after overheating, after dry running, or when the impeller vanes are cracked, stiff, worn, missing, or permanently bent. Pump gaskets and wear surfaces should also be renewed if the pump has been opened or shows signs of leakage, scoring, or compression.
Installation Notes
Inspect the water pump housing, cartridge insert, outer plate, impeller, Woodruff key, gaskets, and fasteners while the lower unit is apart. Lubricate the impeller as specified, install it in the correct rotation, and tighten the cover hardware evenly. After reassembly, verify cooling-water discharge and check for leaks during the first run.
Alternate/Superseded Part Numbers
- 682-W0078-A3-00
- Yamaha 682-W0078-A3-00
- 682W0078A300
- 682-W0078-A2-00
- 682W0078A200
- Included component: 682-44365-00-00 water seal damper
- Included component: 97080-06045-00 bolts, quantity 4
- Included component: 682-44322-00-00 cartridge insert
- Included component: 682-44352-03-00 impeller
- Included component: 682-44315-A0-00 water pump gaskets, quantity 2
- Included component: 682-44323-00-00 outer plate, cartridge
- Included component: 90280-03024-00 Woodruff key
Parts Desk Insight
This is a model-year-sensitive small-outboard water pump kit. The safest match is the Yamaha model code and pump diagram, because nearby F9.9 / T9.9 / FT9.9 kits can look similar but use different wear parts depending on the production range.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.