The Honda 91213-ZG8-003 Oil Seal (35X50X8) is a genuine OEM component designed for GX640 horizontal shaft engines, H4518 lawn tractors, and H5518 multi-purpose tractors. As a direct Honda OEM part, it is manufactured to the same specification as the seal installed at the factory, ensuring a correct fit without modification. Honda supersedes parts at serial breaks, so confirm your machine's serial number against the fitment table before ordering.
Key Features
- Genuine OEM Sealing Integrity — manufactured to Honda's exact dimensional specification for the 35 mm shaft, 50 mm bore, and 8 mm width, delivering the same oil retention as the original installation
- Direct OEM Replacement — designed to drop into the same position as the factory seal on GX640 engines, H4518 lawn tractors, and H5518 multi-purpose tractors, referencing Honda part number 91213-ZG8-003
- Serial Number Verification Recommended — Honda revises sealing components across production runs, so cross-check your unit's serial number against the compatibility table to confirm this is the correct variant for your machine
- Prevents Oil Loss — a worn or hardened seal allows oil to escape past the shaft, leading to low oil levels, lubrication failure, and accelerated internal wear; a fresh seal keeps oil where it belongs and protects the engine or drivetrain
An oil seal is a precision lip seal that closes the gap between a rotating shaft and its surrounding housing, keeping lubricating oil inside the engine or drivetrain and preventing dirt and moisture from entering. The seal's lip maintains constant contact with the spinning shaft, forming a dynamic barrier that holds under both pressure and heat. When the sealing lip wears, hardens, or cracks with age, oil migrates past it — producing external leaks, dropping the oil level, and starving critical components of the lubrication they depend on for long service life.
Part Details
| Part Number | 91213-ZG8-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Oil Seal (35X50X8) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX640 | All |
| Lawn Tractor | H4518 | All |
| Multi-Purpose Tractor | H5518 | 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.
