The Honda 12311-ZG3-020 Cylinder Head Cover is a genuine OEM replacement designed for GD320 and GD410 horizontal shaft diesel engines. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring a proper fit without modification. This Cylinder Head Cover is built for Honda's GD-series diesel engines — confirm your engine model and serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks.
Key Features
- Genuine OEM Diesel Engine Fitment — sourced directly from Honda, this Cylinder Head Cover meets the sealing and retention requirements of the GD320 and GD410 horizontal shaft diesel engines, where combustion pressures and operating temperatures differ from petrol counterparts.
- Exact-Match Replacement — engineered to the same dimensions and mounting profile as the original cover, allowing straightforward installation on compatible GD-series engines.
- Serial Number Verification Recommended — Honda updates OEM part numbers across production runs; check your engine's serial number against the fitment table to confirm part number 12311-ZG3-020 is correct for your specific unit.
- Protects Valvetrain Integrity — a correctly seated cylinder head cover keeps oil in and contaminants out; a cracked, warped, or leaking cover leads to oil loss and potential valvetrain wear on these GD diesel engines.
The cylinder head cover sits atop the cylinder head and encloses the valvetrain — the rocker arms, valves, and associated components that control airflow through the engine on every combustion cycle. It forms a sealed barrier that retains engine oil, preventing leaks and keeping dirt and debris away from precision internal components. On GD-series horizontal shaft diesel engines, a failed or damaged cover can result in oil seepage, increased wear on valvetrain parts, and contamination that shortens engine service life.
Part Details
| Part Number | 12311-ZG3-020 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Cover |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Diesel Engine | GD320 | 1001170-9999999 |
| Horizontal Shaft Diesel Engine | GD410 | 1001552-9999999 |
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.
