The Honda 78122-YG0-003 Shim Washer is a genuine OEM component designed for Honda WT20 and WT30 water pumps. As a direct Honda OEM part, it is manufactured to the exact tolerances Honda specifies for these pumps, ensuring the correct fit without guesswork. This shim washer is listed for both the WT20 and WT30 — confirm the part number 78122-YG0-003 against your pump's serial number and parts diagram before ordering, as Honda supersedes and updates components at specific serial breaks.
Key Features
- Genuine Honda OEM — sourced directly from Honda, this shim washer meets the exact dimensional tolerances specified for WT20 and WT30 water pumps, with no risk of the clearance errors that come from imprecise substitutes.
- Critical Clearance Control — shim washers set and maintain precise running clearances within the pump assembly; the wrong thickness or a worn washer allows excessive play that degrades pump performance and accelerates wear on surrounding components.
- WT20 and WT30 Fitment — confirmed for Honda WT20 and WT30 water pumps; check your serial number against the fitment table, as Honda revises part applicability at serial breaks.
A shim washer is a precision-thickness spacer used within an assembly to set or maintain a specified clearance between moving or mating components. In a water pump, maintaining the correct clearance is essential to proper pump operation — too much play allows components to shift or wear unevenly, while too little can cause binding. Replacing a worn or incorrect shim washer with the correct Honda OEM part restores the tolerances the pump was built to, keeping it delivering the flow and pressure it was designed for.
Part Details
| Part Number | 78122-YG0-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Shim Washer |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT20, WT30 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
