Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00
Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Rep...
Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller repair kit is designed for specified Yamaha 9.9 and 15 HP outboard applications. It includes the internal service components needed to renew the water pump assembly and support reliable engine cooling. Confirm your engine model, year, stroke, serial-number range, and existing part number before ordering.
The kit is listed as a replacement for Yamaha part numbers 682-W0078-A1-00, 682-W0078-A2-00, and 682-W0078-A3-00. Cross-reference numbers include Sierra 18-3148 and 18-3411, and Mariner 46-84277M and 46-84277T. These references are provided for identification and should be checked against the application details below.
- Water pump service kit with impeller, gaskets, plates, key, O-ring, and related service components.
- Aftermarket replacement for specified Yamaha and Mariner outboard applications.
- Silicone grease, glycerin, or dish soap may be used during installation; lubricant is not included.
Part Number Matrix
Use this matrix to compare the listed OEM and aftermarket reference numbers with the part being replaced.
| Brand | Part Number |
|---|---|
| Yamaha | 682-W0078-A1-00 |
| Yamaha | 682-W0078-A2-00 |
| Yamaha | 682-W0078-A3-00 |
| Sierra | 18-3148 |
| Sierra | 18-3411 |
| Mariner | 46-84277M |
| Mariner | 46-84277T |
Engine & Model Compatibility
The following applications are associated with the listed reference numbers. Model designations, production years, stroke type, and serial-prefix conditions must remain matched. Always verify the complete engine identification before installation.
| Brand | Model | Rated HP | Stroke | Years | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha 2-Stroke Applications | ||||||
| Yamaha | 9.9D | 9.9 | 2-Stroke | 1984–1995 | 682-W0078-A1-00 | Verify model and year. |
| Yamaha | 15D | 15 | 2-Stroke | 1984–1995 | 682-W0078-A1-00 | Verify model and year. |
| Yamaha 4-Stroke Applications | ||||||
| Yamaha | F9.9A, AE, AM (66N–66N8) | 9.9 | 4-Stroke | 1985–1996 | 682-W0078-A1-00 | Check the complete model code. |
| Yamaha | F9.9B, BE, BM (6AU1–6AU6, 6DR1–6DR3) | 9.9 | 4-Stroke | 1985–1996 | 682-W0078-A1-00 | Check the complete model code. |
| Yamaha | F9.9 (66R–66R8) | 9.9 | 4-Stroke | 1985–2004 | 682-W0078-A1-00 | Check the complete model code. |
| Yamaha | FT9.9 | 9.9 | 4-Stroke | 1985–1999 | 682-W0078-A1-00 | Thrust model. |
| Yamaha | T9.9 (69V2–69V8) | 9.9 | 4-Stroke | 1991–1999 | 682-W0078-A1-00 | High-thrust model. |
| Mariner Applications | ||||||
| Mariner | 9.9C, serial-prefix 682 | 9.9 | Not specified | Not specified | 46-84277M, 46-84277T | Verify the serial prefix and model documentation. |
Technical Specs
- Product Type
- Water pump impeller repair kit
- Application
- Specified Yamaha and Mariner outboard water pump assemblies
- Installation
- Replacement service kit; fitment must be confirmed before installation
- Stroke Applications
- Listed 2-stroke and 4-stroke applications shown in the compatibility table
- Impeller Material
- Rubber impeller
- Package Dimensions
- Approximately 4.49 × 3.27 × 2.25 inches (114 × 83 × 57 mm)
- Package Weight
- Approximately 7.2 ounces (204 g)
- Installation Lubricant
- Silicone grease, glycerin, or dish soap may be used; not included
What’s in the Box
- Water pump impeller
- Water pump gasket, reference 682-44315-A0-00
- Cartridge insert, reference 682-44322-00-00
- Outer cartridge plate
- Bolts
- Woodruff key
- O-ring
- Additional water pump service seals or components included with the kit
This is an internal water pump service kit. The main water pump housing and lower-unit assembly are not listed as included components.
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Remove the fasteners securing the lower unit and carefully separate the lower unit from the upper housing.
- Locate the water pump housing on top of the lower unit and remove its mounting fasteners.
- Lift the housing from the driveshaft and note the original impeller-vane orientation.
- Remove the old impeller, key, gaskets, plates, and seals. Clean the mating surfaces.
- Install the replacement key, gasket, wear plate, and other applicable components from the kit.
- Apply silicone grease, glycerin, or dish soap to the impeller and pump-housing interior as appropriate. Do not use petroleum-based grease on the rubber impeller.
- Install the impeller on the driveshaft while turning the shaft in the correct direction for the engine so the vanes seat without damage.
- Install the pump housing, seals, and O-rings. Tighten fasteners to the engine manufacturer’s specified torque.
- Reinstall the lower unit, aligning the driveshaft, shift shaft, and water tube. Check for proper water flow before normal operation.
Follow the service manual for your exact engine model. Professional installation is recommended when the correct model, year, serial range, or installation procedure is uncertain.
Troubleshooting & FAQ
How can I confirm fitment?
Compare the complete engine model, year, stroke type, and serial-prefix or serial-number condition with the compatibility table. Also compare the existing water pump part number with the reference numbers listed above. If any detail differs, consult the engine service manual before ordering.
What are signs of a failing water pump impeller?
Possible signs include a weak or absent tell-tale stream, an overheating warning, elevated operating temperature, or reduced cooling performance. A removed impeller may have cracked, brittle, distorted, or missing vanes.
How often should the impeller be inspected?
Inspect the impeller according to the engine manufacturer’s maintenance schedule. Frequent operation in sand, silt, or salt water can increase wear and may require more frequent inspection or replacement.
Does the kit include the water pump housing?
No main upper or lower water pump housing is listed as included. This kit is intended to replace the internal service components identified in the box-contents section.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit. The OEM and aftermarket numbers shown are reference numbers for identification and fitment comparison.
What lubricant is used during installation?
Silicone grease, glycerin, or dish soap may be used as an installation aid when appropriate. Lubricant is not included.
Safety & Important Information
- Confirm the complete engine identification and reference part number before purchase.
- Do not operate an outboard with inadequate cooling-water flow.
- Use the service manual for tightening torques, shift-shaft alignment, and model-specific procedures.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are unfamiliar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Parts and service components for selected marine applications.
- Application-Focused Listings — Reference numbers and model information are provided to help with pre-purchase comparison.
- Support — Review the engine identification and service-manual requirements before installation.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
