Water Pump Repair Kit for Yamaha 150–300 HP Outboards – Replaces 61A-W0078 Series, 18-3396 and 18-3395
Water Pump Repair Kit for Yamaha 150–300 HP Outboards – Replaces 61A-W0078 Series, 18-3396 and 18-3395 is backordered and will ship as soon as it is back in stock.
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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.
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Water Pump Repair Kit for Yamaha 150–300 HP Outboards – Replaces 61...
Water Pump Repair Kit for Yamaha 150–300 HP Outboards – Replaces 61A-W0078 Series, 18-3396 and 18-3395 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Repair Kit is intended for selected Yamaha 150–300 HP outboards using the applicable 61A-W0078 water-pump configuration. It is supplied as a service kit for replacing worn water-pump components, including the impeller, housing, cover, seals, washers and related hardware.
Application depends on the exact engine model, year, stroke and existing water-pump assembly. Always compare your engine identification and original part numbers with the information below before ordering.
- Application: Selected Yamaha 150–300 HP outboards.
- Service use: Water-pump component replacement and cooling-system maintenance.
- Kit contents: Impeller, housing, cover, gaskets, O-rings, washers, key and other listed components.
- Replacement type: Aftermarket direct-fit replacement for applicable assemblies.
Part Number Matrix
The following OEM and aftermarket references are listed for cross-reference purposes. A matching number alone does not replace verification of the complete engine application.
| Brand | Part Number |
|---|---|
| Yamaha | 61A-W0078-A1-00 |
| Yamaha | 61A-W0078-A2-00 |
| Yamaha | 61A-W0078-A3-00 |
| Yamaha | 61A-W0078-A4-00 |
| Sierra | 18-3396 |
| Sierra | 18-3395 |
Engine & Model Compatibility
The applications below represent the model and year ranges associated with this listing. Yamaha model variations may use different water-pump configurations, so confirm the exact model designation, year, stroke and serial-number range before installation.
| Brand | Model or Model Range | Rated HP | Stroke | Years | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | P150 | 150 | 2-Stroke | 1992–1996 | 61A-W0078-A1-00 | Verify exact model and serial range. |
| Yamaha | P175 | 175 | 2-Stroke | 1994–1996 | 61A-W0078-A1-00 | Verify exact model and serial range. |
| Yamaha | P200 | 200 | 2-Stroke | 1991–1996 | 61A-W0078-A1-00 | Verify exact model and serial range. |
| Yamaha | C150 | 150 | 2-Stroke | 1996 | 61A-W0078-A1-00 | Verify exact model and serial range. |
| Yamaha | 150–225 | 150–225 | 2-Stroke | 1996 | 61A-W0078-A1-00 | Model-specific verification required. |
| Yamaha | L150–L250 | 150–250 | 2-Stroke | 1996 | 61A-W0078-A1-00 | Model-specific verification required. |
| Yamaha | S150–S250 | 150–250 | 2-Stroke | 1996 | 61A-W0078-A1-00 | Model-specific verification required. |
| Yamaha | F150–F300 | 150–300 | 4-Stroke | Not specified | 61A-W0078-A3-00 or 61A-W0078-A4-00 | Confirm model year and water-pump configuration. |
| Yamaha | VF200, VF225, VF250 | 200–250 | 4-Stroke | Not specified | 61A-W0078-A3-00 or 61A-W0078-A4-00 | VMAX SHO applications; confirm exact model and year. |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Application
- Selected Yamaha 150–300 HP outboards
- Replacement Type
- Aftermarket direct-fit replacement for applicable assemblies
- Housing Material
- Composite or plastic housing with metal components
- Housing Color
- Black
- Reference Numbers
- Yamaha 61A-W0078-A1-00, 61A-W0078-A2-00, 61A-W0078-A3-00 and 61A-W0078-A4-00; Sierra 18-3396 and 18-3395
What’s in the Box
- 1 x Water Seal Damper (6E5-44365-00-00)
- 1 x Water Pump Housing Cover (6E5-44312-00-00)
- 1 x Water Pump Housing (61A-44311-01-00)
- 1 x Drive Shaft Collar (61A-45527-00-00)
- 1 x Spacer (61A-45538-00-00)
- 1 x Wave Washer (90206-22M19-00)
- 2 x Plate Washer (90201-22M01-00)
- 1 x Water Pump Impeller
- 1 x Gasket Set
- 1 x O-ring Set
- 1 x Woodruff Key
Installation Notes
Inspect the water-pump assembly regularly and replace the impeller and related components according to the engine manufacturer’s service schedule and operating conditions. The following are general service steps; use the service manual for your exact Yamaha model for torque values, alignment details and safety procedures.
- Disconnect the negative battery terminal and secure the engine.
- Remove the lower unit or gearcase according to the applicable service procedure.
- Remove the water-pump housing fasteners and lift the housing from the driveshaft.
- Clean old gasket material and debris from the mating surfaces and driveshaft.
- Install the Woodruff key and slide the replacement impeller onto the driveshaft.
- Install the new gaskets, O-rings, housing and cover in the correct order.
- Tighten the housing fasteners to the manufacturer’s specified torque and sequence.
- Reinstall the lower unit and reconnect all linkages and electrical connections.
- Reconnect the battery and test-run the engine using an appropriate flush device or in the water. Confirm a strong cooling-water telltale stream.
Troubleshooting & FAQ
How can I confirm that this kit fits my Yamaha outboard?
Check the complete engine model, year, stroke and serial-number range, then compare the existing water-pump assembly and part number with the compatibility information and reference numbers listed above. If the configuration or number differs, confirm fitment before ordering.
What are common signs of a failing water pump?
Common symptoms include overheating at idle or low speed, a weak or missing telltale stream, or visible damage to the impeller. Continued operation with inadequate cooling flow can damage the engine.
How often should the water pump be serviced?
Inspect the water-pump assembly according to the engine manufacturer’s maintenance schedule. Service intervals may vary with operating hours, saltwater exposure, storage conditions and impeller condition.
Does this kit contain all the components shown for the listed application?
The package includes the components listed in the “What’s in the Box” section. Confirm that the listed housing, cover, impeller and hardware match your exact engine configuration before beginning the repair.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the applicable Yamaha water-pump configurations and reference numbers listed on this page.
What are the shipping and return terms?
Typical transit time is 5–15 days, with standard shipping available to most regions and expedited options where applicable. Returns are accepted within the applicable policy period for unused items in their original condition. Contact support for current policy details.
Safety & Important Information
- Confirm the exact engine model, year, stroke and serial-number range before purchase.
- Compare the original housing, cover, impeller and mounting arrangement with the supplied components.
- Do not operate the engine without adequate cooling-water flow.
- Follow the manufacturer’s service manual for torque specifications and installation procedures.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended when the correct procedure or application is uncertain.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts designed for demanding service conditions.
- Global Fulfillment — Standard delivery is available to most regions, with shipping options shown at checkout.
- Manufacturer-Direct Value — Competitive pricing on aftermarket marine service parts.
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