The Honda 91212-Z3E-003 Oil Seal (10X20X5) is a genuine OEM sealing component designed for a wide range of Honda equipment, including GX25, GX35, and GX50 horizontal shaft engines, the FG110 tiller, HHT25, HHT35, UMC425, and UMC435 trimmers, and the WX10 water pump. As a direct Honda OEM part, this oil seal is manufactured to the exact dimensions and tolerances required for a proper, leak-free fit. Confirm your unit's serial number against the fitment table before ordering, as Honda periodically supersedes parts at production breaks. When the seal is correct, it installs cleanly and restores proper oil retention to the shaft it serves.
Key Features
- Exact-Dimension OEM Seal — manufactured to Honda's specified 10 mm x 20 mm x 5 mm dimensions, ensuring the seal seats correctly and maintains consistent oil retention at the shaft
- Genuine Honda OEM Part — sourced directly from Honda, this oil seal matches the original component exactly, with no guesswork on sizing or profile
- Broad Fitment Across Honda Equipment — listed for GX25, GX35, and GX50 horizontal shaft engines, the FG110 tiller, HHT25, HHT35, UMC425, and UMC435 trimmers, and the WX10 water pump; verify your serial number against the fitment table to confirm applicability
- Serial Number Verification Recommended — Honda supersedes parts at serial breaks across its equipment lines, so always cross-reference your machine's serial number with the compatibility table before ordering
- Restore Proper Oil Containment — a worn or degraded oil seal allows oil to escape past the shaft, leading to oil loss, contamination of surrounding components, and potential engine or equipment damage; replacing this seal promptly keeps the drivetrain properly lubricated
An oil seal prevents engine or equipment oil from escaping along a rotating shaft by maintaining a controlled, interference-fit barrier between the moving shaft and the stationary housing. In small engines and power equipment like those this seal fits, oil loss at a shaft seal can quickly lead to lubrication starvation, increased internal wear, and eventual component failure. When an oil seal deteriorates — through heat cycling, age, or contamination — it loses its ability to hold back oil, and leaks follow; replacing it with a correctly sized genuine OEM seal restores the barrier and protects the components it serves.
Part Details
| Part Number | 91212-Z3E-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Oil Seal (10X20X5) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX25 | 1001281-9999999 |
| Horizontal Shaft Engine | GX35 | 1002285-9999999 |
| Horizontal Shaft Engine | GX50 | All |
| Tiller | FG110 | 1037066-9999999 |
| Trimmer | HHT25 | 1037066-9999999 |
| Trimmer | HHT35, UMC425, UMC435 | All |
| Water Pump | WX10 | 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.
