The Kubota Z1300 is an 1.3 L (1,272 cc, 77.6 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota Corporation for general-purpose applications.
The cylinder bore and piston stroke are 90.0 mm (3.54 in) and 100.0 mm (3.94 in), respectively. Compression ratio rating is 21.5:1.
The Kubota Z1300 diesel engine produced 26.4 PS (19.4 kW; 26.0 HP) at 2,600 rpm of horsepower and 79.7 N·m (8.1 kg·m, 58.7 ft·lb) at 1,600 rpm of torque.
The Kubota Z1300 features:
- Fuel injection pump
- Centrifugal ball mechanical governor
- Forced lubrication by pump
- Liquid cooling system
- Electric starter 12V, 2.0 kW
- Charging alternator
General information
| Engine Specifications | |
| Engine model | Z1300 |
| Engine type | 4-stroke, vertical, two-cylinders |
| Displacement | 1,272 cm3, (77.6 cu·in) |
| Max. horsepower | 26.4 PS (19.4 kW; 26.0 HP) at 2,600 rpm |
| Max. torque | 79.7 N·m (8.1 kg·m, 58.7 ft·lb) at 1,600 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication by pump |
| Combustion chamber | – |
| Fuel system | Fuel injection pump |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter 12V, 2.0 kW |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 400 x 455 x 554 mm (15.7 x 17.9 x 21.8 in) |
| Dry weight | 115.0 kg (253.5 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 21.5:1 |
| Cylinder bore: | 90.0 mm (3.54 in) |
| Piston stroke: | 100.0 mm (3.94 in) |
| Cylinder internal diameter (standard): | 90.000 mm (3.5433 in) |
| Piston skirt outer diameter (standard): | 89.900-89.920 mm (3.5394-3.5402 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 28.100 mm (1.1063 in) |
| Side clearance (Second): | 0.065-0.090 mm (0.0026-0.0035 in) |
| Side clearance (Oil): | 0.020-0.060 mm (0.0008-0.0024 in) |
| Ring end gap (Top): | 0.300-0.500 mm (0.0118-0.0197 in) |
| Ring end gap (Second): | 0.300-0.500 mm (0.0118-0.0197 in) |
| Number of main bearings: | 3 |
| Crankshaft main journal diameter: | 62.930-62.940 mm (2.4776-2.4779 in) |
| Crankpin journal diameter: | 58.760-58.800 mm (2.3134-2.315 in) |
| Cylinder head | |
| Valves: | 2, (4 valves in total) |
| Valve seat width (INTAKE): | 1.500 mm (0.060 in) |
| Valve seat width (EXHAUST): | 1.500 mm (0.060 in) |
| Value seat angle (INTAKE): | 45° |
| Value seat angle (EXHAUST): | 45° |
| Valveface angle (INTAKE): | 45° |
| Valveface angle (EXHAUST): | 45° |
| Valve steam diameter (INTAKE): | 8.960-8.975 mm (0.3528-0.3533 in) |
| Valve steam diameter (EXHAUST): | 8.960-8.975 mm (0.3528-0.3533 in) |
| Valve spring free length (INTAKE): | 47.5 mm (1.8701 in) |
| Valve spring free length (EXHAUST): | 47.5 mm (1.8701 in) |
| Camshaft journal diameter (front bearing): | 50.000-50.030 mm (1.9685-1.9697 in) |
| Camshaft journal diameter (rear bearing): | 32.000-32.030 mm (1.2598-1.261 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head screw: | 170.0-184.0 Nm (17.3-18.8 kgf·m; 125.5-135.8 lb·ft) |
| Connecting rod screw: | 58.0-64.0 Nm (5.9-6.5 kgf·m; 42.8-47.2 lb·ft) |
| Flywheel screw: | 110.0-115.0 Nm (11.2-11.7 kgf·m; 81.2-84.9 lb·ft) |
| Idle gear shaft screws: | 32.4-37.3 Nm (3.3-3.8 kgf·m; 23.9-27.5 lb·ft) |
| Bearing case cover mounting screw: | 49.0-68.4 Nm (5.0-7.0 kgf·m; 36.2-50.5 lb·ft) |
Service Data
| Engine | |
| Maximum speed: | 2,850 rpm |
| Idle speed: | 600-650 rpm |
| Valve tappet gap | |
| Intake valve: | 0.20-0.25 mm (0.0079-0.0098 in) |
| Exhaust valve: | 0.20-0.25 mm (0.0079-0.0098 in) |
| Oil system | |
| Lubrication system: | Forced lubrication |
| Oil type: | DS or DM |
| Recommended oil: | SAE 80 |
| Oil capacity: | 4.8 L (5.1 US. qt, 4.2 Imp. qt.) |
| Fuel system | |
| Injection timing: | 20° B.T.D.C. |
| Fuel injection pressure | 11.73 MPa (120 kgf/cm2, 1700 psi) |
| Cooling system | |
| Type: | Pressurized radiator, forced circulation with water pump |
| Coolant capacity: | 6.9 liters (7.3 US.qts, 6.1 Imp. qts) |
| Electrical system | |
| Battery: | 12V, 110AH or equivalent |
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