The Honda 12311-Z2E-000 Cylinder Head Cover is a genuine OEM replacement designed for GX440 horizontal shaft engines. As a direct Honda OEM component, it is manufactured to the same specifications as the original part that left the factory, ensuring a correct fit without rework or modification. Honda supersedes parts at serial-number breaks, so verify your engine's serial number against the fitment table before ordering to confirm this is the right cover for your unit.
Key Features
- Genuine Honda OEM Construction — sourced directly from Honda, this cover matches the original in profile, port placement, and sealing geometry, keeping oil where it belongs and outside air out of the valvetrain cavity.
- Direct OEM Replacement — engineered to drop into place on the GX440 horizontal shaft engine with no rework, maintaining the correct mating surface for the head gasket and any associated hardware.
- Serial-Number Sensitive Fitment — Honda revises part numbers at production breaks, so check your GX440 engine serial number against the compatibility table to confirm this cover applies to your specific unit.
- Valvetrain Protection — a correctly sealed cylinder head cover keeps the overhead valve components free from contamination and maintains proper crankcase pressure balance; a cracked or warped cover leads to oil leaks and potential valve gear exposure.
The cylinder head cover sits over the top of the engine's cylinder head, enclosing the overhead valve (OHV) components — rocker arms, valve springs, and associated hardware — in a sealed chamber that retains oil mist for valvetrain lubrication. It also plays a role in maintaining crankcase ventilation by sealing the breather system that is routed through or beneath the cover. When the cover cracks, warps, or develops a failed gasket joint, oil seeps externally down the engine, the valvetrain can become contaminated with dirt, and crankcase pressure may rise — accelerating wear and making a clean repair harder to ignore.
Part Details
| Part Number | 12311-Z2E-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Cover |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX440 | 1000001-1002577 |
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.
