Water Pump Repair Kit for Yamaha F30 and F40 4-Stroke Outboards – Replaces 6BG-W0078-00-00 / 6BG-W0078-01-00
Water Pump Repair Kit for Yamaha F30 and F40 4-Stroke Outboards – Replaces 6BG-W0078-00-00 / 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 for Yamaha F30 and F40 4-Stroke Outboards – R...
Water Pump Repair Kit for Yamaha F30 and F40 4-Stroke Outboards – Replaces 6BG-W0078-00-00 / 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 four-stroke outboard applications. It replaces Yamaha water pump repair kit numbers 6BG-W0078-00-00 and 6BG-W0078-01-00 where the applicable engine parts catalog identifies one of those numbers.
The kit provides the wear, sealing, fastening, and rotating components needed to service the water pump assembly and help restore reliable cooling-water circulation. Because Yamaha fitment can vary by exact model designation and model year, match your complete engine model and existing part number before ordering.
- Aftermarket water pump repair kit for selected Yamaha F30 and F40 4-stroke outboards.
- Includes a replacement impeller, wear components, gaskets, seals, key, bolts, and related hardware.
- Supports water pump service and cooling-system maintenance.
- Not an OEM Yamaha-branded component.
Part Number References
These references identify the application family for this repair kit. Part-number references do not replace confirmation of the exact engine model and year.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 6BG-W0078-00-00 | Water pump repair kit reference |
| Yamaha | 6BG-W0078-01-00 | Water pump repair kit reference used in later catalog records |
Engine & Model Compatibility
Catalog records identify this water pump repair kit for selected Yamaha F30 and F40 four-stroke models. The model designator, year, shaft configuration, and serial-number range must remain consistent when confirming fitment.
| Brand | Model | Rated HP | Stroke | Catalog years represented | Applicable reference |
|---|---|---|---|---|---|
| Yamaha | F30LA | 30 | 4-Stroke | 2021–2022 catalog records | 6BG-W0078-01-00 |
| Yamaha | F30LEHA | 30 | 4-Stroke | 2021–2022 catalog records | 6BG-W0078-01-00 |
| Yamaha | F40JEA | 40 | 4-Stroke | 2009–2022 catalog records | 6BG-W0078-00-00 / 6BG-W0078-01-00 |
| Yamaha | F40JEHA | 40 | 4-Stroke | 2009–2022 catalog records | 6BG-W0078-00-00 / 6BG-W0078-01-00 |
| Yamaha | F40LA | 40 | 4-Stroke | 2009–2022 catalog records | 6BG-W0078-00-00 / 6BG-W0078-01-00 |
| Yamaha | F40LEHA | 40 | 4-Stroke | 2009–2022 catalog records | 6BG-W0078-00-00 / 6BG-W0078-01-00 |
| Yamaha | F40SA | 40 | 4-Stroke | 2021 catalog record | 6BG-W0078-01-00 |
Important: The table lists catalog-supported model examples, not every possible Yamaha configuration. Confirm the full model code, year, shaft or mounting configuration, and serial-number range against your engine parts diagram before installation.
Technical Specifications
- Product Type
- Water pump repair kit
- Application
- Selected Yamaha F30 and F40 4-stroke outboards
- Installation
- Replacement service part for the existing water pump assembly
- Housing
- Repair-kit components shown below; a complete water pump housing is not listed as included
- Brand Status
- Aftermarket replacement, not OEM Yamaha
What’s in the Box
- 1 x Pump Housing Cover (63D-44312-00-00)
- 1 x Water Pump Gasket (63D-44316-00-00)
- 1 x Insert Cartridge (63D-44322-00-00)
- 1 x Cartridge Outer Plate (63D-44323-00-00)
- 1 x Water Seal Damper 2 (663-44366-00-00)
- 1 x Impeller (6H4-44352-02-00)
- 4 x Bolts with Washers (90119-08M15-00)
- 4 x Bolt Washers (90209-08M02-00)
- 1 x Woodruff Key (90280-03M03-00)
- 1 x O-Ring (93210-59MG7-00)
Installation Notes
- Disconnect the battery and remove the engine cover according to the service-manual procedure.
- Place a suitable drain pan under the lower unit and remove the gearcase drain screw if required for lower-unit removal.
- Remove the fasteners securing the lower unit to the upper casing.
- Lower the gearcase carefully to access the water pump assembly, keeping the driveshaft and water tube protected.
- Remove the water pump cover and take out the old impeller, key, gasket, wear plate, insert, seals, and related hardware.
- Clean the mating surfaces and inspect the pump plate, cover, housing, water tube, and driveshaft for corrosion, scoring, or damage.
- Install the new gasket, wear components, key, and impeller. Confirm that the impeller is correctly positioned on the key and that the vanes are oriented for installation.
- Install the cover, O-ring, seal, bolts, and washers. Tighten all fasteners to the torque specified in the applicable Yamaha service manual.
- Reinstall the lower unit, ensuring correct driveshaft engagement and water-tube alignment.
- Refill the gearcase with the specified marine lubricant if it was drained.
- Run the outboard only with an adequate water supply and confirm a strong tell-tale stream and normal cooling-system operation.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Check the complete engine model designation, model year, shaft or mounting configuration, and serial-number range against the Yamaha parts diagram. Also compare the existing water pump repair kit number with 6BG-W0078-00-00 or 6BG-W0078-01-00. A horsepower-only match is not sufficient.
What are common signs of a worn water pump?
A weak or intermittent tell-tale stream, overheating warning, steam, reduced cooling-water flow, or an engine that runs hotter than normal can indicate water pump wear. Other cooling-system restrictions should also be checked.
Should I replace the entire repair kit or only the impeller?
Replacing the complete repair kit is generally preferable when the wear plate, insert, gasket, key, O-ring, or seals show wear. Replacing only an impeller may not correct leakage or excessive clearance in the remaining components.
Can this kit correct every overheating problem?
No. Overheating can also result from blocked water intakes, clogged cooling passages, a damaged water tube, thermostat problems, or other cooling-system faults. Inspect the complete system if the symptom remains after water pump service.
Are special tools required?
Basic mechanical tools and a torque wrench are normally required, but the exact procedure varies by model. Use the service manual for the correct lower-unit removal procedure, fastener torque, lubricant specification, and safety requirements.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement kit intended for applications that use the listed Yamaha reference numbers. Yamaha is a trademark of its respective owner and is used only to identify compatibility.
Safety & Important Information
- Verify the exact engine model, year, configuration, and part-number reference before ordering.
- Do not operate an outboard without an adequate water supply.
- Follow the applicable service manual for torque values, sealant requirements, gearcase lubrication, and lower-unit installation.
- Inspect all mating surfaces and related cooling-system components before reassembly.
- Professional installation is recommended when lower-unit service experience is limited.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard maintenance and repair.
- Application-Focused Listings — Product references and model information are provided to support correct part matching.
- Service-Friendly Support — Use your engine model and existing part numbers when requesting fitment assistance.
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