Description
Overview:
This mechanical seal is the shaft sealing assembly for the Honda WB20XT water pump, supplied as a direct-fit replacement to stop leakage along the pump shaft and restore correct performance. It sits between the impeller and pump casing, keeping water in the volute while the engine drives the shaft. The assembly typically combines hard, lapped sealing faces (carbon/ceramic pair), a stainless steel spring, and an oil‐ and water‐resistant elastomer boot to maintain constant contact and seal integrity under normal operating temperatures. Built to meet OEM specifications, it helps protect bearings and maintain prime and pressure on the Honda WB20XT. Honda reference: 78130-YB4-003. Suitable for routine maintenance or repair when a pump begins to drip, loses pressure, or has been run dry.
Key Features:
- Direct-fit replacement for Honda WB20XT (reference 78130-YB4-003)
- Hard carbon/ceramic sealing faces for wear resistance and reliable sealing
- Stainless steel spring maintains face contact as parts bed in
- Durable elastomer components for a tight static seal in the housing
- Designed to meet OEM specifications for fit and performance
- Helps prevent water leaks, protecting bearings and engine interface
- Supports correct pump pressure and flow after service
- Straightforward installation with standard hand tools and correct seating practice
Typical Applications:
Used when servicing or rebuilding a Honda WB20XT pump that shows water dripping from the pump body, contamination in the crankcase area, loss of pressure, or after dry running or abrasive wear. Common on site dewatering, landscaping, irrigation, flooding cleanup, and general transfer duties where clean or slightly silty water is moved. Suitable for preventative maintenance to keep the pump reliable for day-to-day work.
Also known as:
Mechanical face seal, pump shaft seal, rotary shaft seal, water pump seal, ceramic/carbon seal set, primary seal, rotating seal assembly, impeller shaft seal, wet end seal, WB20XT shaft seal kit.
Fits Models:
WB20XT
Product Specifications
| L&S Part No. | 78130 YB4 003 |
|---|---|
| Manufacturer | Honda |
| OEM No. | 78130YB4003 |
| Unit of Sale | 1 |
| Machine Type | Pumps |
| Fits Brands | Honda |
| Key Features | - Direct-fit replacement for Honda WB20XT water pump - Hard carbon/ceramic sealing faces resist wear - Stainless steel spring ensures consistent seal contact - Elastomer boot resists oil and water - Meets OEM specifications for fit and performance |
| Fits Models | WB20XT |
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