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
Injection type
Indirect injection
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):
75.946-76.100 mm (2.990-2.996 in)
Piston skirt diameter (standard):
75.844-75.921 mm (2.986-2.989 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
Author:Sergei Wers About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
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.
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