The Kubota Z402-EB is a 400 cc, (24.41 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Kubota for general-purpose applications.
The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 62.2 mm (2.45 in). The compression ratio rating is 23.0:1.
This engine produced 8.6 PS (6.3 KW; 8.4 HP) at 3,000 rpm of net (intermittent) power and 8.8 PS (6.5 KW; 8.7 HP) at 3,000 rpm of gross (intermittent) power.
The Kubota Z402-EB features:
- Spherical type combustion chamber
- Bosch MD type mini pump
- Centrifugal ball mechanical governor
- Forced lubrication by trochoid pump
- Water cooling system with pressurized radiator
- Electric starter (12V, 1.2 kW)
General information
| Engine Specifications | |
| Engine model | Z402-EB |
| Engine type | 4-stroke, OHV, two-cylinders |
| Displacement | 400 cm3, (24.41 cu·in) |
| Max. horsepower | Net (intermittent): 8.6 PS (6.3 KW; 8.4 HP) at 3,000 rpm Gross (intermittent): 8.8 PS (6.5 KW; 8.7 HP) at 3,000 rpm Gross (cont.): 7.5 PS (5.5 KW; 7.4 HP) at 3,000 rpm |
| Max. torque | – |
| Cooling system | Liquid-cooled with pressurized radiator |
| Lubricating system | Forced lubrication by pump |
| Fuel system | Bosch MD type mini pump |
| Injection type | Indirect injection |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 1.2 kW) |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W x H): | 314 x 380 x 449 mm (12.38 x 14.98 x 17.68 in) |
| Weight: | 56 kg (123.5 Ibs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 23.0:1 |
| Cylinder bore: | 64.0 mm (2.52 in) |
| Piston stroke: | 62.2 mm (2.45 in) |
| Cylinder internal diameter (standard): | 64.000-64.019 mm (2.5199-2.5204 in) |
| Piston skirt outer diameter (standard): | – |
| Number of piston rings (compression / oil): | 2/1 |
| Piston ring side clearance (Second): | 0.085-0.112 mm (0.0033 to 0.0044 in) |
| Piston ring side clearance (Oil): | 0.040-0.080 mm (0.0016 to 0.0031 in) |
| Ring end gap (Top): | 0.250-0.400 mm (0.0098-0.0157 in) |
| Ring end gap (Second): | 0.250-0.400 mm (0.0098-0.0157 in) |
| Ring end gap (Oil): | 0.150-0.300 mm (0.0059-0.0117 in) |
| Crankshaft main journal diameter: | Bearing №1,3: 39.934-39.950 mm (1.5722-1.5728 in) Bearing №2: 43.934-43.950 mm (1.7297-1.7303 in) |
| Crankpin journal diameter: | 33.959-33.975 mm (1.337-1.3376 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 4 (2 valves in total) |
| Valve timing (INTAKE): | Open: 20° Before T.D.C. Close: 45° After B.D.C. |
| Valve timing (EXHAUST): | Open: 50° Before B.D.C. Close: 15° After T.D.C. |
| Valve steam diameter (INTAKE): | 5.968-5.980 mm (0.2349 to 0.2354 in) |
| Valve steam diameter (EXHAUST): | 5.968-5.980 mm (0.2349 to 0.2354 in) |
| Valve seat angle (INTAKE): | 45° |
| Valve seat angle (EXHAUST): | 45° |
| Valve face angle (INTAKE): | 45° |
| Valve face angle (EXHAUST): | 45° |
| Valve spring free length (INTAKE): | 31.6 mm (1.244 in) |
| Valve spring free length (EXHAUST): | 31.6 mm (1.244 in) |
| Rocker arm shaft outer diameter (standard): | 10.473-10.484 mm (0.41232-0.41276 in) |
| Rocker arm inner diameter (standard): | 10.500-10.518 mm (0.4134-0.4141 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head screws (M8x1.25): | 37.2-42.1 Nm (3.8-4.3 kgf-m, 27.5-31.1 lb-ft) |
| Main bearing case screws 1 (M6x1.0): | 12.7-15.7 Nm (1.3-1.6 kgf-m, 9.4-11.6 lb-ft) |
| Main bearing case screws 1 (Flywheel side) (M8x1.25): | 23.5-27.4 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft) |
| Main bearing case screws 2 (M7x1.0): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Connecting rod screws (M7x0.75): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Flywheel screws (M10x1.25): | 53.9-58.8 Nm (5.5-6.0 kgf-m, 39.8-43.4 lb-ft) |
| Rocker arm bracket nuts (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Bearing case cover screws (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Idle gear shaft screws (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Crankshaft end bolt (M12x1.5): | 117.6-127.4 Nm (12.0-13.0 kgf-m, 86.4-93.6 lb-ft) |
| Glow plugs (M8x1.0): | 7.8-14.7 Nm (0.8-1.5 kgf-m, 5.8-10.8 lb-ft) |
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 pump |
| Oil type: | API CD or CE |
| Recommended oil: | SAE 30, 10W-30 |
| Oil capacity: | 1.9 liters (2.0 US.qts, 1.67 Imp. qts) |
| Oil filter type: | Full flow paper filter (cartridge) |
| Oil pressure indicating: | Electrical type switch |
| Oil pressure: | At Idle speed: 98 kPa (1.O kgf/cm2, 14 psi) At Rated speed: 196.0-441.O kPa (2.0-4.5 kgf/cm2, 28.0-64.0 psi) |
| Cooling system | |
| Type | Liquid-cooled with pressurized radiator |
| Coolant capacity | – |
| Thermostat’s valve opening temperature | 69.5-72.5 °C (157.1-162.5 °F) |
| Temperature at which thermostat completely opens | 85 °C (185 °F) |
| Fuel system | |
| Type: | Bosch MD type mini pump |
| Injection timing: | 18-20° Before T.D.C. |
| Injection nozzle fuel injection pressure: | 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi) |
| Electrical system | |
| Battery: | 12V, CCA 600A or equivalent |
| Starting motor | Electric starter (12V, 1.2 kW) |
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