The Kubota Z602-E4B is a 599 cc (36.5 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine from the Super-mini series, manufactured by Kubota for general-purpose applications.
It has a 72.0 mm (2.83 in) cylinder bore and a 73.6 mm (2.9 in) piston stroke. The compression ratio rating is 24.0:1.
The Z602-E4B engine produced 15.8 PS (11.6 kW; 15.6 HP) at 3,600 rpm of net (intermittent) horsepower and 37.8 Nm (3.86 kg·m; 27.9 ft·lb) at 2,600 rpm of peak torque.
The Kubota Z602-E4B features:
- Spherical type combustion chamber
- Bosch MD-type mini fuel injection pump
- Bosch throttle type injection nozzle
- Centrifugal ball mechanical governor
- Forced lubrication by pump
- Liquid cooling system
- Electric starter (12V, 1.0 kW)
- Charging alternator (12V, 480 W)
General information
| Engine Specifications | |
| Engine model | Z602-E4B |
| Engine type | 4-stroke, vertical, two-cylinders |
| Displacement | 599 cm3, (36.5 cu·in) |
| Max. horsepower | Net (continuous): 13.7 PS (10.1 KW; 13.5 HP) at 3,600 rpm Net (intermittent): 15.8 PS (11.6 KW; 15.6 HP) at 3,600 rpm Gross (intermittent): 17.0 PS (12.5 KW; 16.8 HP) at 3,600 rpm |
| Max. torque | 37.8 Nm (3.86 kg·m; 27.9 ft·lb) at 2,600 rpm |
| Emission type | EPA/CARB Tier 4 (NRTC/NTE test mode) + EU Stage V |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication by pump |
| Combustion chamber | Spherical type (E-TVCS) |
| Fuel injection pump | Bosch MD type mini pump |
| Injection type | Indirect injection |
| Injection nozzle | Bosch throttle type |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 1.0 kW) |
| Starting support device | Glow plug in combustion chamber |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 384 x 404 x 544 mm (15.1 x 15.9 x 21.4 in) |
| Dry weight | 57.0 kg (125.7 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 24.0:1 |
| Cylinder bore: | 72.0 mm (2.83 in) |
| Piston stroke: | 73.6 mm (2.9 in) |
| Cylinder internal diameter (standard): | 72.000-72.019 mm (2.8346-2.8354 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 20.025-20.040 mm (0.7884-0.789 in) |
| Piston pin diameter: | 20.002-20.040 mm (0.7875-0.789 in) |
| Side clearance (Second): | 0.090-0.120 mm (0.0035-0.0047 in) |
| Side clearance (Oil): | 0.040-0.080 mm (0.0016-0.0031 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Second): | 0.350-0.500 mm (0.0138-0.0197 in) |
| Ring end gap (Oil): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Number of main bearings: | 3 |
| Crankshaft main journal diameter: | 43.934-43.950 mm (1.72969-1.73032 in) |
| Crankpin journal diameter: | 33.959-33.975 mm (1.337-1.3376 in) |
| Cylinder head | |
| Valves: | 2,(4 valves in total) |
| Valve timing (INTAKE): | – |
| Valve timing (EXHAUST): | – |
| Valve seat width (INTAKE): | 2.120 mm (0.0835 in) |
| Valve seat width (EXHAUST): | 2.120 mm (0.0835 in) |
| Value seat angle (INTAKE): | 45° |
| Value seat angle (EXHAUST): | 45° |
| Valveface angle (INTAKE): | 45° |
| Valveface angle (EXHAUST): | 45° |
| Valve steam diameter (INTAKE): | 5.968-5.980 mm (0.2349-0.2354 in) |
| Valve steam diameter (EXHAUST): | 5.968-5.980 mm (0.2349-0.2354 in) |
| Valve spring free length (INTAKE): | 31.6 mm (1.2441 in) |
| Valve spring free length (EXHAUST): | 31.6 mm (1.2441 in) |
| Tappet outer diameter: | 17.966-17.984 mm (0.7073-0.7080 in) |
| Rocker arm shaft outer diameter: | 10.473-10.484 mm (0.4123-0.4127 in) |
| Camshaft lobe height (INTAKE): | 26.880 mm (1.0583 in) |
| Camshaft lobe height (EXHAUST): | 26.880 mm (1.0583 in) |
| Camshaft journal diameter : | 32.934-32.950 mm (1.2966-1.2972 in) |
Tightening torque
| Tightening torque specs | |
| Head cover cap nuts (M6x1.0): | 3.9-5.3 Nm (0.4-0.6 kgf-m, 2.9-4.3 lb-ft) |
| Head bolts (M8x1.25): | 39.2-44.1 Nm (4.0-4.5 kgf-m, 28.9-32.5 lb-ft) |
| Main bearing case bolts 1 (M6x1.0): | 12.7-15.7 Nm (1.3-1.6 kgf-m, 9.4-11.6 lb-ft) |
| Main bearing case screw 2 (M7x1.0): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Flywheel bolts (M10x1.25): | 53.9-58.8 Nm (5.5-6.0 kgf-m, 39.8-43.4 lb-ft) |
| Connecting rod bolts (M7x0.75): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Rocker arm bracket nuts (M6x1.0): | 9.81-11.28 Nm (1.0-1.15 kgf-m, 7.23-8.32 lb-ft) |
| Idle gear shaft bolts (M6x1.0): | 9.8-11.3 Nm (1.00-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Idle gear shaft screws (M6x1.0): | 9.8-11.3 Nm (1.00-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Glow plugs (M8x1.0): | 7.8-14.7 Nm (0.8-1.5 kgf-m, 5.8-10.8 lb-ft) |
| Nozzle holder assembly (M20x1.5): | 49.0-68.6 Nm (5.0-7.0 kgf-m, 36.2-50.6 lb-ft) |
| Nozzle holder and nozzle retaining nut: | 58.8-78.5 Nm (6.0-8.0 kgf-m, 43.4-57.9 lb-ft) |
| Injection pipe retaining nuts: | 24.5-34.3 Nm (2.5-3.5 kgf-m, 18.1-25.3 lb-ft) |
Service Data
| Engine | |
| Maximum speed: | 3,450 rpm or 3,800 rpm (depending on version) |
| Idle speed: | 900-1000 rpm |
| Cylinder compression: | 36.0-41.0 kgf/cm2 (3.53-4.02 MPa, 512-583 psi) |
| Compression differential limit between cylinders: | 10% or less |
| 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 |
| Oil capacity: | 2.5 L (2.6 US. qt, 2.21 Imp. qt.) |
| Oil filter: | Full flow paper filter (cartridge type) |
| Oil pressure: | At idle spped: 98 kPa (1.0 kgf/cm2, 14 psi) At rated speed: 196-441 kPa (2.0-4.5 kgf/cm2, 29-64 psi) |
| Fuel system | |
| Fuel injection pump | Bosch MD-type mini pump |
| Injection nozzle | Bosch throttle type |
| Injection timing: | 19° B.T.D.C. |
| Fuel injection pressure | 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi) |
| Cooling system | |
| Type: | Pressurized radiator, forced circulation with water pump (not included in the basic engine) |
| 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) |
| Coolant capacity: | 2.8 liters (3.0 US.qts, 2.5 Imp. qts) |
| Electrical system | |
| Battery: | 12V, 36AH or equivalent |
| Alternator stator resistance: | Less than 1.0 Ω |
| Alternator rotor resistance: | Less than 2.9 Ω |
| Alternator slip ring: | 14.4 mm (0.567 in) |
| Alternator brush Length: | 10.5 mm (0.413 in) |
| Alternator (no-load voltage): | AC 20V at 5,200 rpm |
| Glow plug resistance: | Approx 0.9 Ω |
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