Description
Sierra 18-3412 Yamaha Water Pump Kit With Housing 9.9-15 HP
Service the cooling system on your compatible Yamaha outboard with the Sierra 18-3412 water pump kit. This aftermarket kit brings the matched pump components together for scheduled maintenance or repair. A replacement pump housing is included.
Key Features
- Sierra manufacturer part number 18-3412
- Includes the outer water pump housing
- Includes a replacement impeller and matching pump service components
- Designed for the Yamaha applications and OEM references listed below
Applications
For select Yamaha outboard cooling systems. Compatibility depends on the exact engine model, model year and original pump assembly.
Fitment / Product Details
- Brand: Sierra
- Product: Water pump service kit
- Engine style: Outboard
- Condition: New
- Housing included: Yes
- Yamaha references: 63V-W0078-01-00, 63V-44301-00-00
- Yamaha 9.9 and 15 HP two-stroke outboards: 1996-2009
- Yamaha F9.9 and T9.9: 2005-2006
- Yamaha F15: 1998-2005; verify model code for transition-year engines
Model-year listings are application examples, not a guarantee for every engine of the same horsepower. Match the complete model code and OEM part number to your engine's parts diagram before ordering.
What's Included
- 1 × 18-3356 water pump housing
- 1 × 18-3040 impeller
- 1 × 18-3444 insert cup
- 1 × 18-3195 wear plate
- 1 × impeller key
- 1 × water seal
- 4 × 18-0256 bolts
One Sierra 18-3412 water pump kit.
Service Notes
- Follow the Yamaha service manual for lower-unit removal, impeller orientation, lubricants and fastener torque.
- Inspect the pump housing, sealing surfaces and water passages during service. Replace any damaged parts.
- Use the specified cooling-water supply when testing after installation; do not run the water pump dry.
- If overheating continues, diagnose the rest of the cooling system.
Why You Should Buy
A matched service kit helps simplify parts selection for a compatible pump rebuild. Replacing worn pump components supports proper cooling-water circulation and dependable engine maintenance.
Common Applications
- Scheduled water pump and impeller maintenance
- Replacement of worn pump components on verified Yamaha applications
- Pump service requiring a replacement housing
FAQ
Does this kit include the housing?
Yes, a replacement water pump housing is included.
Will it fit any Yamaha 9.9-15 HP outboard?
No. Check the complete engine model, year and OEM pump references above. Horsepower alone does not confirm fitment.
Is this a Yamaha-branded OEM kit?
No. This is a Sierra aftermarket replacement kit for the specified Yamaha applications.