The Kubota Z750 is a 743 cc (45.3 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 76.0 mm (2.99 in) and 82.0 mm (3.23 in), respectively. Compression ratio rating is 21.0:1.
This engine produced 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm of horsepower.
The Kubota Z750 features:
- Fuel injection pump
- Centrifugal ball mechanical governor
- Forced lubrication by pump
- Liquid cooling system
- Electric starter
- Charging alternator
General information
| Engine Specifications | |
| Engine model | Z750A |
| Engine type | 4-stroke, vertical, two-cylinders |
| Displacement | 743 cm3, (45.3 cu·in) |
| Max. horsepower | 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm |
| Max. torque | – |
| 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 |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 393 x 435 x 540 mm (15.5 x 17.1 x 21.3 in) |
| Dry weight | 71.0 kg (156.5 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 21.0:1 |
| Cylinder bore: | 76.0 mm (2.99 in) |
| Piston stroke: | 82.0 mm (3.23 in) |
| Cylinder internal diameter (standard): | 79.000-79.030 mm (3.1102-3.1114 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 23.100 mm (0.9094 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): | 0.300-0.450 mm (0.0118-0.0177 in) |
| Ring end gap (Second): | 0.300-0.450 mm (0.0118-0.0177 in) |
| Ring end gap (Oil): | 0.250-0.400 mm (0.0098-0.0157 in) |
| Number of main bearings: | 3 |
| Crankshaft main journal diameter: | 51.990-52.010 mm (2.0468-2.0476 in) |
| Crankpin journal diameter: | 43.880-43.900 mm (1.7276-1.7283 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): | 7.950-7.975 mm (0.313-0.314 in) |
| Valve steam diameter (EXHAUST): | 7.950-7.975 mm (0.313-0.314 in) |
| Valve spring free length (INTAKE): | 42.0 mm (1.6535 in) |
| Valve spring free length (EXHAUST): | 42.0 mm (1.6535 in) |
| Cam height (INTAKE): | 36.870 mm (1.4516 in) |
| Cam height (EXHAUST): | 36.870 mm (1.4516 in) |
| Camshaft journal diameter : | 39.935-39.950 mm (1.5722-1.5728 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head screw: | 75.0-82.0 Nm (7.65-8.40 kgf·m, 55.3-60.5 lb·ft) |
| Connecting rod screw: | 37.0-41.0 Nm (3.8-4.2 kgf·m; 27.3-30.3 lb·ft) |
| Flywheel screw: | 54.0-58.0 Nm (5.5-5.9 kgf·m; 39.9-42.8 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: | 2,950 rpm |
| Idle speed: | 600-650 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.18-0.22 mm (0.0071-0.0087 in) |
| Exhaust valve clearance: | 0.18-0.22 mm (0.0071-0.0087 in) |
| Oil system | |
| Lubrication system: | Forced lubrication |
| Oil type: | DS or DM |
| Recommended oil: | SAE 80 |
| Oil capacity: | 3.5 L (3.7 US. qt, 3.08 Imp. qt.) |
| Fuel system | |
| Injection timing: | 25° 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 |
| Coolant capacity: | 5.3 liters (5.6 US.qts, 4.7 Imp. qts) |
| Electrical system | |
| Battery: | 12V, 65AH or equivalent |
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