Kubota Z750

Kubota Z750The Kubota Z750 is a 0.75 L (743 cc, 45.34 cu·in) straight-two, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota for general-purpose applications.

A 76.0 mm (2.99 in) cylinder bore and 82.0 mm (3.23 in) piston stroke give the Kubota Z750 engine a total of 743 cc of displacement. The compression ratio rating is 21.0:1.

The Z750 diesel engine produced 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm of output power.

The breakdown of the engine code is as follows:

  • Z – 2-cylinders
  • 750 – Approximate displacement 750 cc

General information

Engine Specifications
Engine code Z750A
Layout Straight-2, vertical diesel engine
Fuel type Diesel fuel No.2-D
Displacement 0.75 L, 743 cm3 (45.34 cu in)
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
Max. Horsepower 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm
Torque output
Firing order 1-2
Dimensions (L x W x H): 393 x 435 x 540 mm (15.5 x 17.1 x 21.3 in)
Weight 71.0 kg (156.5 lbs)

Cylinder block

Cylinder block
Compression ratio: 21.0:1
Cylinder bore: 76.0 mm (2.99 in)
Piston stroke: 82.0 mm (3.23 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder inner diameter: 79.000-79.030 mm (3.1102-3.1114 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 0.300-0.450 mm (0.0118-0.0177 in)
Second 0.300-0.450 mm (0.0118-0.0177 in)
Oil 0.250-0.400 mm (0.0098-0.0157 in)
Piston pin outer diameter 23.100 mm (0.9094 in)
Crankshaft main journal diameter: 51.990-52.010 mm (2.0468-2.0476 in)
Crankpin diameter: 43.880-43.900 mm (1.7276-1.7283 in)

Cylinder head

Cylinder head
Valve Arrangement: OHV, gear drive
Valves: 4 (2 valves per cylinder)
Valve timing: INTAKE
Valve seat width: INTAKE 1.500 mm (0.060 in)
EXHAUST 1.500 mm (0.060 in)
Valve stem diameter: INTAKE 7.950-7.975 mm (0.313-0.314 in)
EXHAUST 7.950-7.975 mm (0.313-0.314 in)
Valve spring free length: INTAKE 42.0 mm (1.6535 in)
EXHAUST 42.0 mm (1.6535 in)
Cam height: INTAKE 36.870 mm (1.4516 in)
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)

Maintenance data

Valve clearance
Intake valve 0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve 0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Recommended engine oil DS or DM
SAE viscosity number SAE 80
Engine 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
Coolant capacity: 5.3 liters (5.6 US.qts, 4.7 Imp. qts)
Electrical system
Battery: 12V, 65Ah or equivalent
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