The Honda 31100-ZG4-801 Flywheel is a genuine OEM component designed for GD320 horizontal shaft diesel engines. Sourced directly from Honda, this flywheel meets the exact specifications of the original part and slots in without modification. If your GD320 diesel is exhibiting rough running, difficult starting, or irregular combustion cycles, a worn or damaged flywheel is often the culprit — and this OEM replacement brings the engine back to correct operating condition. Always confirm your unit's serial number against the fitment table before ordering, as Honda periodically supersedes parts at production breaks.
Key Features
- Genuine Honda OEM — manufactured to Honda's original specification for the GD320 diesel, ensuring the mass, balance, and timing mark positions are exactly right for this engine.
- Ignition Timing Integrity — the flywheel carries the magnets and timing reference that the ignition system reads; a correctly balanced OEM flywheel maintains the precise firing timing a diesel engine depends on for clean combustion and reliable starting.
- Direct OEM Replacement — engineered to replace part number 31100-ZG4-801 on the GD320 horizontal shaft diesel engine with no adaptation required.
- Serial Number Verification Recommended — Honda supersedes components at production breaks, so cross-check your engine's serial number against the compatibility table to confirm this is the correct flywheel for your unit.
The flywheel is a heavy rotating disc bolted to the crankshaft that serves two critical roles in a diesel engine. First, its mass smooths out the power pulses of the combustion cycle, keeping the crankshaft spinning evenly between firing strokes and delivering steady, vibration-free output. Second, it carries the magnets and reference markers that the ignition and charging systems rely on — without a correctly weighted and precisely marked flywheel, ignition timing drifts, the engine becomes hard to start, and power output drops. A cracked, out-of-balance, or otherwise damaged flywheel causes roughness, vibration, and in severe cases can damage the crankshaft itself, making prompt replacement essential.
Part Details
| Part Number | 31100-ZG4-801 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Flywheel |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Diesel Engine | GD320 | 1001208-9999999 |
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.
