Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series, 18-3396, 18-3395)
Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series, 18-3396, 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
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Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces ...
Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series, 18-3396, 18-3395) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078 Series) is engineered for a complete overhaul of the cooling system on a wide range of Yamaha V6 outboards. It is designed for 2-Stroke V6 models from 150-250 HP (1991–1996) and modern 4-Stroke V6 outboards from 150-300 HP, including F-series and VMAX SHO engines.
The kit serves as a direct interchange for Yamaha part numbers 61A-W0078-A1-00, 61A-W0078-A2-00, 61A-W0078-A3-00, and 61A-W0078-A4-00, as well as Sierra aftermarket parts 18-3396 and 18-3395.
- Installation: Direct replacement for a complete and straightforward service.
- Durability: Features a robust composite housing with integrated metal components for longevity.
- Completeness: Includes the impeller, housing, cover, gaskets, O-rings, and all necessary hardware for a full repair.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| 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
Confirm your engine model/year in the table below.
This kit is verified for the following Yamaha outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | P150 | 150 | 2-Stroke | 1992–1996 | 61A-W0078-A1-00 | |
| Yamaha | P175 | 175 | 2-Stroke | 1994–1996 | 61A-W0078-A1-00 | |
| Yamaha | P200 | 200 | 2-Stroke | 1991–1996 | 61A-W0078-A1-00 | |
| Yamaha | C150 | 150 | 2-Stroke | 1996 | 61A-W0078-A1-00 | |
| Yamaha | 150-225 | 150-225 | 2-Stroke | 1996 | 61A-W0078-A1-00 | |
| Yamaha | L150-L250 | 150-250 | 2-Stroke | 1996 | 61A-W0078-A1-00 | |
| Yamaha | S150-S250 | 150-250 | 2-Stroke | 1996 | 61A-W0078-A1-00 | |
| Yamaha | F150-F300 | 150-300 | 4-Stroke | 61A-W0078-A3-00/A4-00 | Modern V6 outboards | |
| Yamaha | VF200, VF225, VF250 | 200-250 | 4-Stroke | 61A-W0078-A3-00/A4-00 | VMAX SHO models |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct Replacement
- Housing Material
- Composite/Plastic with Metal Components
- Housing Color
- Black
- Fitting Type
- Direct Fit
- Other Technical Attributes
- Complete kit includes impeller, housing, gaskets, and all necessary components
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 Impeller
- 1 x Gasket Set
- 1 x O-rings Set
- 1 x Woodruff Key
Installation Notes
For optimal reliability, we recommend replacing the water pump impeller and related components every 300 operating hours or every 3 years, whichever comes first. Follow these general steps for installation:
- Disconnect the negative battery terminal for safety.
- Unbolt and remove the lower unit (gearcase) from the outboard motor.
- Remove the bolts securing the water pump housing and carefully lift it off the driveshaft.
- Clean any old gasket material or debris from the mounting surface and driveshaft.
- Install the new Woodruff key and slide the new impeller onto the driveshaft.
- Place the new gaskets and O-rings, then fit the new housing and cover.
- Tighten the housing bolts to the manufacturer's specified torque in a crisscross pattern.
- Reinstall the lower unit, reconnect all linkages, and secure it.
- Reconnect the battery and test-run the engine using a flush-muff or in the water, confirming a strong tell-tale stream.
Troubleshooting & FAQ
How can I confirm this kit fits my specific Yamaha outboard?
First, check your engine model and year against the Engine & Model Compatibility table. Second, cross-reference your existing part number with those listed in the Part Number Matrix. If both match, the kit will fit.
What are the signs of a failing water pump?
The most common symptoms are engine overheating at idle or low speeds and a weak or non-existent water stream from the "telltale" outlet. A worn impeller cannot efficiently pump cooling water, leading to poor performance and potential engine damage.
How often should I service the water pump?
As a preventative maintenance item, the water pump assembly should be inspected annually and fully replaced every 300 hours of use or every 3 years, regardless of hours. This prevents impeller material from degrading and failing unexpectedly.
Does this kit contain everything I need for the job?
Yes, this is a comprehensive kit that includes the impeller, housing, cover, gaskets, O-rings, washers, and other essential hardware shown in the "What's in the Box" list for a complete replacement.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials and is manufactured in an ISO 9002 facility, where it undergoes batch inspection for consistency and quality.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free to most regions, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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