The Honda 91251-740-003 Oil Seal (12X18X4.2) is a genuine OEM replacement designed for GX160 horizontal shaft engines, HP250 power carriers, and HP400 power carriers. As an authentic Honda part, it is manufactured to the same specifications as the original, ensuring a correct fit right out of the box. Always confirm your machine's serial number against the fitment table, as Honda supersedes parts at serial breaks and this seal may not apply to every production run of these models.
Key Features
- OEM Oil Retention — manufactured to Honda's original sealing dimensions (12X18X4.2 mm) to maintain the correct interference fit and prevent oil leakage at the sealing point
- Exact-Dimension Replacement — the 12X18X4.2 mm profile matches the original bore and shaft size for a direct drop-in installation with no reworking
- Broad Fitment — listed for GX160 horizontal shaft engines, HP250 power carriers, and HP400 power carriers; verify your serial number against the fitment table to confirm applicability
- Failure Prevention — a degraded or leaking oil seal allows lubrication to escape and contaminants to enter, accelerating internal wear; replacing it promptly protects the components it serves
An oil seal creates a dynamic barrier between a rotating shaft and its surrounding housing, keeping engine or drivetrain oil where it belongs while blocking dirt, debris, and moisture from entering. When this seal hardens, cracks, or deforms with age and heat cycles, oil begins to weep past it — leading to low oil levels, contamination, and accelerated wear on bearings and other internal components. Replacing a worn Oil Seal (12X18X4.2) with a genuine Honda part restores the original sealing integrity and keeps the machine running cleanly.
Part Details
| Part Number | 91251-740-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Oil Seal (12X18X4.2) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX160 | All |
| Power Carrier | HP250 | 2007113-9999999 |
| Power Carrier | HP400 | 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.
