Water Pump Repair Kit – Fits Yamaha F30 and F40 4-Stroke Outboards (Selected 2009–2022 Models) – Replaces 6BG-W0078-00-00 and 6BG-W0078-01-00
Water Pump Repair Kit – Fits Yamaha F30 and F40 4-Stroke Outboards (Selected 2009–2022 Models) – Replaces 6BG-W0078-00-00 and 6BG-W0078-01-00 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Repair Kit – Fits Yamaha F30 and F40 4-Stroke Outboards ...
Water Pump Repair Kit – Fits Yamaha F30 and F40 4-Stroke Outboards (Selected 2009–2022 Models) – Replaces 6BG-W0078-00-00 and 6BG-W0078-01-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit is designed for selected Yamaha F30 and F40 4-stroke outboard applications. Catalog records identify the water pump repair kit for Yamaha F30LA, F30LEHA, F40JEA, F40JEHA, F40LA, F40LEHA, and related model variants in specific production years. It supplies the components needed to service the water pump and restore proper cooling-system performance.
The kit is listed as a replacement for Yamaha OEM references 6BG-W0078-00-00 and 6BG-W0078-01-00. Related aftermarket references include Sierra 18-3450, GLM 12510, and JLM YHJB-6BG. Always match the complete engine model, year, and existing part number before ordering.
- Aftermarket water pump repair kit for selected Yamaha 4-stroke outboards.
- Designed to renew key water-pump service components.
- Helps restore cooling-water flow when the existing pump components are worn or damaged.
- Not an OEM Yamaha component.
Part Number Matrix
Use these references as a cross-check against your original part and service information. Number listings are not a substitute for confirming the complete engine application.
| Brand | Part Number | Reference Type |
|---|---|---|
| Yamaha | 6BG-W0078-00-00 | OEM reference |
| Yamaha | 6BG-W0078-01-00 | OEM reference |
| Sierra | 18-3450 | Aftermarket reference |
| GLM | 12510 | Aftermarket reference |
| JLM | YHJB-6BG | Aftermarket reference |
Engine & Model Compatibility
The applications below are catalog-supported examples. The same model family can have different parts depending on year, suffix, shaft configuration, or serial-number range. Confirm your exact engine identification before installation.
| Brand | Model | Rated HP | Stroke | Catalog Year | Applicable Reference |
|---|---|---|---|---|---|
| Yamaha | F30LA | 30 | 4-Stroke | 2021–2022 | 6BG-W0078-01-00 |
| Yamaha | F30LEHA | 30 | 4-Stroke | 2021–2022 | 6BG-W0078-01-00 |
| Yamaha | F40JEA | 40 | 4-Stroke | 2009–2011 and 2021–2022 | 6BG-W0078-00-00 or 6BG-W0078-01-00 |
| Yamaha | F40JEHA | 40 | 4-Stroke | 2009–2011 and 2021–2022 | 6BG-W0078-00-00 or 6BG-W0078-01-00 |
| Yamaha | F40LA | 40 | 4-Stroke | 2009–2011 and 2021–2022 | 6BG-W0078-00-00 or 6BG-W0078-01-00 |
| Yamaha | F40LEHA | 40 | 4-Stroke | 2009–2011 | 6BG-W0078-00-00 |
| Yamaha | F40SA | 40 | 4-Stroke | 2021 | 6BG-W0078-01-00 |
Technical Specs
- Product Type
- Water pump repair kit
- Application
- Selected Yamaha F30 and F40 4-stroke outboard applications
- Installation
- Replacement service part; lower-unit removal is required
- Brand Status
- Aftermarket replacement, not OEM Yamaha
What’s in the Box
- 1 x Water pump cover
- 1 x Water pump gasket
- 1 x Cartridge insert
- 1 x Cartridge outer plate
- 1 x Water seal
- 1 x Water pump impeller
- 4 x Bolts with washers
- 1 x Woodruff key
- 1 x O-ring
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Remove the lower unit from the engine midsection, supporting it securely because it may be heavy.
- Place the lower unit on a stable workbench and remove the water pump housing.
- Note the orientation of the original components, then remove the old impeller, gaskets, seals, and wear components.
- Clean all mating surfaces and remove old gasket material, debris, and corrosion.
- Install the replacement components in the correct order. Lightly lubricate the impeller as appropriate and turn the driveshaft clockwise during installation.
- Reinstall the water pump housing with the seals correctly seated. Tighten fasteners to the manufacturer’s specifications.
- Apply suitable marine grease to the driveshaft splines and reinstall the lower unit.
- Run the engine with an appropriate flush attachment and confirm a steady tell-tale stream before returning the boat to service.
Troubleshooting & FAQ
How do I know if my water pump impeller is failing?
Common signs include a weak or intermittent tell-tale stream, an overheating warning, or an impeller with cracked, brittle, distorted, or missing vanes. Inspect the complete pump assembly if cooling performance is reduced.
How often should I replace the water pump impeller?
Inspect the impeller during routine service and replace it when wear, damage, deformation, or loss of flexibility is found. Replacement intervals can be shorter in sandy, silty, or saltwater operating conditions; follow the maintenance schedule for your exact engine.
My Yamaha model is not listed. Will this kit fit?
Do not rely on horsepower alone. Confirm the complete model designation, year, shaft or length configuration, serial-number range when applicable, and the OEM reference in your service information. The listed references are 6BG-W0078-00-00 and 6BG-W0078-01-00.
Is this kit difficult to install?
Installation requires removal of the lower unit and correct water-pump assembly. It is suitable for an experienced marine technician or mechanically confident owner. Professional installation is recommended if you are unfamiliar with lower-unit service.
Is this an OEM Yamaha kit?
No. This is an aftermarket replacement kit intended for the listed applications and reference numbers.
What should I verify before ordering?
Compare the old pump assembly, complete engine model, production year, and applicable OEM reference. If any detail differs, confirm compatibility with a Yamaha service manual or qualified marine-parts specialist before purchase.
Safety & Important Information
- Verify the complete engine model and year before ordering; model families may use different water-pump parts.
- Compare the replacement components with the original assembly before installation.
- Disconnect the battery before service and support the lower unit securely during removal.
- Follow the engine manufacturer’s torque values, lubrication instructions, and cooling-system test procedure.
- This is an aftermarket replacement, not an OEM Yamaha component.
- Professional installation is recommended when lower-unit service experience is limited.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for routine marine maintenance and repair.
- Application-Focused Listings — Product information is organized around engine models, reference numbers, and service use.
- Practical Service Support — Confirming the exact model and part reference helps ensure the correct replacement before installation.
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