Water Pump Repair Kit Without Housing – Fits Yamaha F300/F350 V8 4-Stroke Outboards (Replaces 6AW-W0078-00)
Water Pump Repair Kit Without Housing – Fits Yamaha F300/F350 V8 4-Stroke Outboards (Replaces 6AW-W0078-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing – Fits Yamaha F300/F350 V8 4-...
Water Pump Repair Kit Without Housing – Fits Yamaha F300/F350 V8 4-Stroke Outboards (Replaces 6AW-W0078-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit Without Housing is an aftermarket cooling-system service kit for Yamaha F300 and F350 V8 4-Stroke outboard engines. It is intended to restore water-pump service components while reusing the existing water-pump housing where the housing remains serviceable.
The kit is identified as an aftermarket replacement for Yamaha OEM reference 6AW-W0078-00. Catalog references also list the corresponding full-format Yamaha number 6AW-W0078-00-00 and aftermarket reference 18-3477.
- Product type: Water pump repair kit without housing
- Application: Yamaha F300 and F350 V8 4-Stroke outboards
- Installation: Service replacement; reuse the original water-pump housing if it is in serviceable condition
- Housing: Not included
- Brand status: Aftermarket replacement, not a Yamaha OEM component
Part Number Matrix
Use the references below to compare the kit with your original part and service documentation. Part-number references do not replace confirmation of the complete engine model and application.
| Reference Type | Brand or Catalog | Part Number |
|---|---|---|
| OEM reference | Yamaha | 6AW-W0078-00 |
| Full-format OEM reference | Yamaha | 6AW-W0078-00-00 |
| Aftermarket catalog reference | Sierra | 18-3477 |
Engine & Model Compatibility
This repair kit is listed for Yamaha 4-Stroke V8 outboards in the F300 and F350 horsepower classes. The available catalog relationship covers 300–350 HP V8 4-Stroke applications, including F300 and F350 model families.
| Brand | Model Family | Rated HP | Stroke | Engine Configuration | OEM Reference | Application Notes |
|---|---|---|---|---|---|---|
| Yamaha | F300 | 300 HP | 4-Stroke | V8 | 6AW-W0078-00 | Water pump repair kit without housing |
| Yamaha | F350 | 350 HP | 4-Stroke | V8 | 6AW-W0078-00 | Water pump repair kit without housing |
Fitment note: Yamaha model suffixes, production years, and serial-number ranges can affect parts selection. Confirm the complete model designation and compare the original kit before ordering.
Technical Specs
- Product Type
- Water Pump Repair Kit Without Housing
- Application
- Yamaha F300 and F350 V8 4-Stroke outboards
- Rated Engine Range
- 300–350 HP
- Housing
- Not included; designed for service work using the existing housing when suitable
- Product Classification
- Aftermarket replacement
- OEM Reference
- 6AW-W0078-00
- Aftermarket Reference
- 18-3477
What’s in the Box
- One aftermarket water pump repair kit without housing
Important: The water-pump housing is not included. Do not assume that a housing, complete lower-unit assembly, or unrelated impeller-only component is part of this listing. Confirm the actual kit contents against the product packaging before installation.
Installation Notes
- Verify the complete Yamaha engine model, horsepower, stroke, and serial information before beginning service.
- Stop the engine, disconnect the battery, and follow the safety procedures in the applicable Yamaha service manual.
- Remove the lower unit according to the manufacturer’s procedure and secure it safely before opening the water-pump assembly.
- Remove the water-pump cover and existing service components. Keep track of the original component arrangement and key or drive features.
- Inspect the existing water-pump housing and related mating surfaces for scoring, distortion, corrosion, or excessive wear. Replace damaged parts before reassembly.
- Install the replacement kit components in the correct orientation and use the manufacturer’s specified lubricant, sealant, torque values, and tightening sequence.
- Reassemble the lower unit and verify that the driveshaft, water tube, and shift mechanism are correctly aligned.
- Run the engine only with an appropriate water supply and check for a strong, consistent cooling-water tell-tale stream and any temperature warnings.
Troubleshooting & FAQ
How do I confirm this kit fits my Yamaha engine?
Confirm that your engine is a Yamaha F300 or F350 V8 4-Stroke outboard and compare the complete model designation, serial information, and original water-pump kit reference. The kit is listed for the 300–350 HP V8 4-Stroke application, but model suffix and serial conditions should still be checked.
Is this a complete water-pump kit with housing?
No. This is a water-pump repair kit without housing. The existing housing must be reused only if it is in serviceable condition, and any damaged housing should be replaced separately.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement associated with Yamaha OEM reference 6AW-W0078-00. Yamaha is a trademark of its respective owner, and this product is not manufactured by Yamaha.
What are common signs that the water-pump system needs service?
Possible symptoms include a weak or intermittent tell-tale stream, overheating at idle or low speed, a high-temperature warning, or visible deterioration of the removed service components. Diagnose the complete cooling system before replacing parts.
How often should the water-pump components be serviced?
Service intervals depend on the engine manufacturer’s maintenance schedule, operating hours, and conditions such as saltwater, sand, or silt. Follow the Yamaha service documentation for your specific engine.
What should I do if my housing is worn?
Do not install a new service kit against a scored, distorted, or excessively worn housing. Replace the damaged housing or other worn components as required by the manufacturer’s service procedure.
Safety & Important Info
- Confirm the complete engine model and serial information before purchase and installation.
- The housing is not included with this repair kit.
- This is an aftermarket replacement, not an OEM Yamaha component.
- Use the correct service manual procedures, torque specifications, lubricants, and safety equipment.
- Professional installation is recommended when lower-unit or water-pump service experience is limited.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for routine marine maintenance and repair.
- Application-Focused Listings — Product references and engine applications are provided to support part selection.
- Service Support — Compare your original part and contact support if you need help verifying the application.
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