The Kubota Z1300 is a 1.3 L (1,272 cc, 77.6 cu·in) straight-two, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota for general-purpose applications.
A 90.0 mm (3.54 in) cylinder bore and 100.0 mm (3.94 in) piston stroke give the Z1300 engine a total of 1272 cc of displacement. The compression ratio rating is 21.5:1.
This 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 breakdown of the engine code is as follows:
- Z – 2-cylinders
- 1300 – Approximate displacement 1300 cc
General information
| Engine Specifications | |
| Engine code | Z1300 |
| Layout | Straight-2, vertical diesel engine |
| Fuel type | Diesel fuel No.2-D |
| Production | – |
| Displacement | 1.3 L, 1,272 cm3 (77.6 cu in) |
| Max. Horsepower | 26.4 PS (19.4 kW; 26,0 HP) at 2,600 rpm |
| Torque output | 79.7 N·m (8.1 kg·m, 58.7 ft·lb) at 1,600 rpm |
| Injection type | Indirect injection |
| Cooling system | Liquid-cooled |
| Fuel system | Fuel injection pump |
| Fuel nozzle | – |
| Starting system | Electric starting with 12V starter |
| Starting support device | – |
| Governor | Centrifugal ball mechanical governor |
| Power adder | None |
| Firing order | 1-2 |
| Dimensions (L x W x H): | 400 x 455 x 554 mm (15.7 x 17.9 x 21.8 in) |
| Weight | 115.0 kg (253.5 lbs) |
Cylinder block
| Cylinder block | ||
| Compression ratio: | 21.5:1 | |
| Cylinder bore: | 90.0 mm (3.54 in) | |
| Piston stroke: | 100.0 mm (3.94 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder inner diameter: | 90.000 mm (3.5433 in) | |
| Piston skirt diameter | – | |
| Piston ring side clearance: | Second | 0.065-0.090 mm (0.0026-0.0035 in) |
| Oil | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Piston ring end gap: | Top | 0.300-0.500 mm (0.0118-0.0197 in) |
| Second | 0.300-0.500 mm (0.0118-0.0197 in) | |
| Piston pin outer diameter | 28.100 mm (1.1063 in) | |
| Crankshaft main journal diameter: | 62.930-62.940 mm (2.4776-2.4779 in) | |
| Crankpin diameter: | 58.760-58.800 mm (2.3134-2.315 in) | |
Cylinder head
| Cylinder head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 valves per cylinder) | |
| Valve timing: | INTAKE | – |
| EXHAUST | – | |
| Valve seat width: | INTAKE | 1.500 mm (0.060 in) |
| EXHAUST | 1.500 mm (0.060 in) | |
| Valve stem diameter: | INTAKE | 8.960-8.975 mm (0.3528-0.3533 in) |
| EXHAUST | 8.960-8.975 mm (0.3528-0.3533 in) | |
| Valve spring free length: | INTAKE | 47.5 mm (1.8701 in) |
| EXHAUST | 47.5 mm (1.8701 in) | |
| Camshaft journal diameter: |
Front bearing: 50.000-50.030 mm (1.9685-1.9697 in) 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) |
Maintenance data
| 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 | |
| Recommended engine oil | DS or DM |
| SAE viscosity number | SAE 80 |
| Engine 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 | |
| Coolant capacity: | 6.9 liters (7.3 US.qts, 6.1 Imp. qts) |
| Electrical system | |
| Battery: | 12V, 110Ah or equivalent |
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