The Honda 91003-ZG4-000 Ring Set (80) is a genuine OEM component designed for GD320 horizontal shaft diesel engines. As a direct OEM replacement sourced from Honda, this Ring Set (80) is manufactured to the same specifications as the original part fitted on the production line. Confirm your engine's serial number against the fitment table before ordering, as Honda supersedes piston ring sets at serial number breaks on the GD320.
Key Features
- OEM Bore Sealing — genuine Honda manufacture ensures the correct ring gap, tension, and profile for the GD320 diesel's combustion chamber, maintaining compression and proper oil control
- Direct OEM Replacement — this Ring Set (80) is built to Honda's original specification, dropping into the GD320 cylinder bore without modification
- GD320 Diesel Fitment — designed specifically for GD320 horizontal shaft diesel engines; verify your serial number against the fitment table to confirm the correct ring set for your engine
- Compression and Oil Control — worn or broken piston rings allow combustion gases to blow past the piston, increasing oil consumption, reducing power output, and producing visible exhaust smoke; replacing with this OEM set restores proper engine performance
Piston rings seal the gap between the piston and the cylinder wall, performing two critical jobs in a diesel engine: holding combustion pressure above the piston to generate power, and scraping excess oil back down into the crankcase to prevent it from burning. On a GD320 diesel engine, where high compression ratios place significant load on the rings, a worn or broken ring set leads to lost compression, increased oil consumption, and hard starting. Replacing the rings with a genuine OEM set restores the tight bore seal the engine depends on for full power and efficient operation.
Part Details
| Part Number | 91003-ZG4-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Ring Set (80) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Diesel Engine | GD320 | 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.
