Water Pump Repair Kit Without Housing for Yamaha Outboards – Replaces 61A-W0078-A3-00 and 61A-W0078-A4-00
Water Pump Repair Kit Without Housing for Yamaha Outboards – Replaces 61A-W0078-A3-00 and 61A-W0078-A4-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing for Yamaha Outboards – Replac...
Water Pump Repair Kit Without Housing for Yamaha Outboards – Replaces 61A-W0078-A3-00 and 61A-W0078-A4-00 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit is an aftermarket replacement service kit for selected Yamaha outboard cooling-system applications. The kit is supplied without the water-pump housing and is intended to renew the impeller, insert, wear plate, gaskets, O-rings, dowel pins, key, and related pump hardware during water-pump service.
The documented Yamaha reference numbers for this configuration include 61A-W0078-A3-00 and 61A-W0078-A4-00. Because Yamaha used different pump configurations across engine families, confirm the complete engine model, year, stroke, shaft configuration, and original water-pump reference before ordering.
- Aftermarket water-pump repair kit for selected Yamaha outboards.
- Supplied without the water-pump housing.
- Includes an impeller, impeller key, insert cup, wear plate, gaskets, O-rings, dowel pins, and pump fasteners.
- Designed for cooling-system service when the existing housing is reusable and within service limits.
Reference Numbers
These numbers are manufacturer or aftermarket catalog references associated with this water-pump kit family. They are provided for identification only; verify the application against your engine before installation.
| Brand | Reference | Application Note |
|---|---|---|
| Yamaha | 61A-W0078-A3-00 | Water-pump kit reference used on selected Yamaha 2-stroke applications. |
| Yamaha | 61A-W0078-A4-00 | Water-pump repair-kit reference used on selected Yamaha 4-stroke applications. |
| Sierra | 18-3396-1 | Aftermarket catalog reference associated with the Yamaha water-pump kit family; confirm housing configuration before purchase. |
| Mallory | 9-48618 | Aftermarket catalog reference; application and contents should be verified against the original part. |
Engine Compatibility
Catalog records associate the 61A-W0078-A3-00 reference with selected Yamaha 2-stroke engines, including examples from the 150, 175, and 200 hp families. The 61A-W0078-A4-00 reference is documented on selected Yamaha 4-stroke engines, including F150 and F175 variants. The examples below are not a substitute for model and serial-number verification.
| Brand | Model Example | Rated HP | Stroke | Year Example | Reference |
|---|---|---|---|---|---|
| Yamaha | 150TJRV, 150TLRV, C150TLRV, L150TXRV, S150TLRV | 150 | 2-Stroke | 1997 | 61A-W0078-A2-00 |
| Yamaha | 200TLRV, L200TXRV, S200TXRV | 200 | 2-Stroke | 1997 | 61A-W0078-A2-00 |
| Yamaha | LZ150TXRY, VZ150TLRY, Z150TLRY, Z150TXRY | 150 | 2-Stroke | 2000 | 61A-W0078-A3-00 |
| Yamaha | LZ200TXRY, Z200TLRY, Z200TXRY | 200 | 2-Stroke | 2000 | 61A-W0078-A3-00 |
| Yamaha | 150TXRZ, LX150TXRZ, LZ150TXRZ, SX150TXRZ, VX150TLRZ, VZ150TLRZ | 150 | 2-Stroke | 2001 | 61A-W0078-A3-00 |
| Yamaha | F150JB, F150LB, F150LB2, F150LCA, F150LCA2, F150XB, F150XB2, F150XCA, F150XCA2 | 150 | 4-Stroke | 2021 | 61A-W0078-A4-00 |
| Yamaha | F175LA | 175 | 4-Stroke | 2021 | 61A-W0078-A4-00 |
Important: The references above occur in different Yamaha model, year, and configuration records. Do not treat a horsepower-only match as confirmed fitment. Check the original pump reference and compare the existing parts before ordering.
Technical Specifications
- Product Type
- Water pump repair kit
- Housing
- Not included; supplied without water-pump housing
- Installation
- Replacement service part for selected Yamaha outboards
- Reference Numbers
- 61A-W0078-A3-00 and 61A-W0078-A4-00
- Construction
- Aftermarket replacement components
What's in the Box
- 1 x Insert cup / cartridge insert, Yamaha reference 61A-44322-02-00
- 1 x Water-pump gasket, Yamaha reference 6E5-44315-A0-00
- 1 x Impeller, Yamaha reference 6E5-44352-01-00
- 1 x Wear plate / cartridge outer plate, Yamaha reference 6G5-44323-01-00
- 4 x Pump bolts with washers
- 1 x Woodruff key, Yamaha reference 90280-04M05-00
- 1 x O-ring, Yamaha reference 93210-37M67-00
- 1 x O-ring, Yamaha reference 93210-86M38-00
- 2 x Dowel pins, Yamaha reference 93606-12019-00
The water-pump housing is not included. Reuse the original housing only after checking it for grooves, cracks, distortion, corrosion, and excessive wear.
Installation Notes
- Disconnect the battery and secure the outboard according to the manufacturer's service procedure.
- Remove the lower unit and drain the gearcase lubricant as required by the service manual.
- Remove the water-pump cover and take out the old impeller, key, gasket, insert, wear plate, O-rings, pins, and related hardware.
- Inspect the reusable housing and driveshaft. Do not install the kit if the housing is damaged or excessively worn.
- Clean all mating surfaces and install the new gasket, insert, wear plate, key, and impeller in the correct order.
- Rotate the driveshaft in the manufacturer's specified direction while seating the impeller vanes in the housing.
- Install the new O-rings, dowel pins, bolts, and washers. Tighten fasteners to the Yamaha service-manual specification for the exact engine.
- Reinstall the lower unit, aligning the driveshaft, shift shaft, and water tube correctly.
- Refill the gearcase with the specified marine lubricant.
- Run the engine only with an adequate water supply and confirm a steady tell-tale stream and normal operating temperature.
Always use the service manual for the exact engine model, serial range, torque values, sealants, and adjustment procedures.
Troubleshooting & FAQ
How do I confirm fitment?
Compare the complete engine model, year, stroke, shaft configuration, and original water-pump reference with the compatibility information. The strongest confirmation is a match to 61A-W0078-A3-00 or 61A-W0078-A4-00 together with the correct pump configuration. Horsepower alone is not sufficient.
Does this kit include the water-pump housing?
No. This listing is for a repair kit without the housing. The original housing must be inspected and reused only if it is serviceable.
What are the symptoms of a worn water pump?
Common symptoms include a weak or intermittent tell-tale stream, overheating alarms, steam, elevated operating temperature, or a damaged, brittle, or cracked impeller.
Can I use the kit on any Yamaha 75–300 hp engine?
No. The kit is not confirmed for every Yamaha engine in that horsepower range. Yamaha water-pump parts vary by model, year, stroke, shaft configuration, and serial range. Verify the exact application before purchase.
Is this an OEM Yamaha kit?
No. This is an aftermarket replacement kit. Yamaha reference numbers are used only to identify the intended application and cross-reference the original service parts.
How often should the impeller be serviced?
Inspect the water pump according to the engine manufacturer's maintenance schedule. Replace the impeller sooner when the engine operates in saltwater, sand, silt, or other abrasive conditions, or whenever overheating or reduced tell-tale flow occurs.
Can I install it without a service manual?
Professional installation is recommended. Correct assembly, torque, sealants, lower-unit alignment, and post-installation cooling-system testing depend on the exact engine model.
Safety & Important Information
- Confirm the engine model, year, stroke, serial range, and original part reference before ordering.
- Do not install the kit if the pump housing, driveshaft, or mating surfaces are damaged or outside service limits.
- Never run an outboard without an adequate water supply.
- This is an aftermarket replacement part and is not manufactured by Yamaha.
- Use the exact manufacturer's torque and maintenance specifications for your engine.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for routine marine maintenance and repair.
- Application-Focused Information — Reference numbers and compatibility details are provided to help match the correct service part.
- Support for Maintenance Work — Review the complete engine information and contact support if you need help comparing the original part.
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