The Honda 78122-YG1-003 Shim Washer is a genuine OEM component designed for WT20 and WT30 water pumps. As an authentic Honda part, it is manufactured to the exact dimensions required for correct fit and function in these pumps. Honda supersedes parts at serial breaks, so confirm your pump's serial number against the fitment table before ordering to ensure part number 78122-YG1-003 is the right match for your unit.
Key Features
- Genuine OEM Fit — sourced directly from Honda, this shim washer meets the exact dimensional tolerances required for the WT20 and WT30 water pumps.
- Precise Shimming — shim washers control axial clearance and spacing within the pump assembly; using the correct thickness ensures components seat properly and the pump performs as designed.
- Serial Number Verification Recommended — Honda updates parts at production breaks, so check your pump's serial number against the compatibility table to confirm this is the correct washer for your machine.
A shim washer is a thin, flat spacer used to set or adjust the clearance between rotating or stationary components within the pump assembly. By controlling that spacing precisely, it ensures internal parts align correctly and operate without excessive play or binding. When the wrong thickness is used — or the washer is worn or missing — clearances fall outside specification, which can lead to premature wear of adjacent components and reduced pump performance.
Part Details
| Part Number | 78122-YG1-003 |
|---|---|
| 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.
