Description
Sierra 18-3370 Yamaha Water Pump Repair Kit Without Housing
Service the cooling system on your compatible Yamaha outboard with the Sierra 18-3370 water pump kit. This aftermarket kit brings the matched pump components together for scheduled maintenance or repair. This kit does not include a pump housing; inspect your existing housing before reusing it.
Key Features
- Sierra manufacturer part number 18-3370
- Excludes 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: No
- Yamaha references: 692-W0078-00-00, 692-W0078-01-00, 692-W0078-A0-00
- 60 HP (2004-2005)
- 70 HP (2004-2009)
- C75 (1994-1999)
- C85 (1991-1996) and CV85 (1989-1990)
- 90 HP (1984-2009) and C90 (1997-2001)
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 × 18-3070 impeller
- 1 × 18-3301 impeller key
- 1 × 18-0239 water pump gasket
- 1 × 18-0240 water pump gasket
- 1 × 18-7436 O-ring
- 1 × insert cup
- 1 × wear plate
- 1 × additional water pump gasket
- 4 × bolts
One Sierra 18-3370 water pump kit. Pump housing is sold separately.
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 when the existing housing remains serviceable
FAQ
Does this kit include the housing?
No. This is the without-housing kit; the existing housing must be inspected and reused or purchased separately.
Will it fit any Yamaha 60-90 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.