The Kubota Z430 is a 425 cc, (25.9 cu·in) natural aspirated two-cylinder four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Kubota for general-purpose applications.
The cylinder bore is 66.0 mm (2.60 in) and the piston stroke is 62.2 mm (2.45 in).
This engine produced 12.0 PS (8.8 KW; 11.8 HP) at 3,200 rpm of horsepower.
The Kubota Z430 features:
- Spherical type combustion chamber
- Fuel injection pump
- Centrifugal governor
- Forced lubrication by trochoid pump
- Water cooling system with pressurized radiator
- Electric starter (12V, 0.7 kW)
General information
| Engine Specifications | |
| Engine model | Z430 |
| Engine type | 4-stroke, OHV, two-cylinders |
| Displacement | 425 cm3, (25.9 cu·in) |
| Max. horsepower | 12.0 PS (8.8 KW; 11.8 HP) at 3,200 rpm |
| Max. torque | – |
| Cooling system | Liquid-cooled with pressurized radiator |
| Lubricating system | Forced lubrication by trochoid pump |
| Fuel system | Injection pump |
| Injection type | Indirect injection |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 0.7 kW) |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | – |
| Cylinder bore: | 66.0 mm (2.60 in) |
| Piston stroke: | 62.2 mm (2.45 in) |
| Cylinder internal diameter (standard): | 66.130-65.960 mm (2.6044-2.5984 in) |
| Piston skirt outer diameter (standard): | 65.906 mm (2.5957 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Ring end gap (Top): | 0.430-0.885 mm (0.0169-0.0348 in) |
| Ring end gap (Second): | 0.430-0.885 mm (0.0169-0.0348 in) |
| Crankshaft main journal diameter: | 39.934-39.950 mm (1.5722-1.5728 in) |
| Crankpin journal diameter: | 33.959-33.975 mm (1.337-1.3376 in) |
| Crankshaft center distance: | 31.1 mm (1.225 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 4 (2 valves in total) |
| Valve head diameter (INTAKE): | 26.00 mm (1.0236 in) |
| Valve head diameter (EXHAUST): | 22.50 mm (0.8858 in) |
| Valve steam diameter (INTAKE): | 5.980 mm (0.2354 in) |
| Valve steam diameter (EXHAUST): | 5.980 mm (0.2354 in) |
Service Data
| Valve clearance | |
| Intake valve clearance: | 0.145-0.185 mm (0.0057-0.0073 in) |
| Exhaust valve clearance: | 0.145-0.185 mm (0.0057-0.0073 in) |
| Oil system | |
| Lubrication system: | Forced lubrication by trochoid pump |
| Oil type: | API CC or CD |
| Recommended oil: | SAE 30, 10W-30 |
| Oil capacity: | 2.0 liters (2.11 US.qts, 1.76 Imp. qts) |
| Oil filter type: | Full flow paper filter (cartridge) |
| Cooling system | |
| Type | Liquid-cooled with pressurized radiator |
| Coolant capacity | 1.9 liters (2.0 US.qts, 1.67 Imp. qts) |
| Fuel system | |
| Type: | Injection pump |
| Electrical system | |
| Battery: | 12V, 35AH or equivalent |
| Starting motor | Electric starter (12V, 0.7 kW) |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| Kubota | G4200, G4200H |
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