Kubota Z1100

Kubota Z1100The Kubota Z1100 is a 1.1 L (1,070 cc, 65.3 cu·in) straight-two, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota for general-purpose applications.

A 88.0 mm (3.46 in) cylinder bore and 88.0 mm (3.46 in) piston stroke give the Kubota Z1100 engine a total of 743 cc of displacement. The compression ratio rating is 20.0:1.

The Z1100 diesel engine produced 21.1 PS (15.5 kW; 21.0 HP) at 2,700 rpm of output power.

The breakdown of the engine code is as follows:

  • Z – 2-cylinders
  • 1100 – Approximate displacement 1100 cc

General information

Engine Specifications
Engine code Z1100A
Layout Straight-2, vertical diesel engine
Fuel type Diesel fuel No.2-D
Displacement 1.1 L, 1,070 cm3 (65.3 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 21.1 PS (15.5 kW; 21.0 HP) at 2,700 rpm
Torque output
Firing order 1-2
Dimensions (L x W x H): 397 x 447 x 543 mm (15.6 x 17.6 x 21.4 in)
Weight 92.0 kg (202.8 lbs)

Cylinder block

Cylinder block
Compression ratio: 20.0:1
Cylinder bore: 88.0 mm (3.46 in)
Piston stroke: 88.0 mm (3.46 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder inner diameter: 88.000-88.020 mm (3.4646-3.4653 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: Flywheel end: 80.020-80.039 mm (3.1504-3.1511 in)
Timing gear end: 60.011-60.024 mm (2.3626-2.3631 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 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: Flywheel side: 19.983-20.110 mm (0.7867-0.7917 in)
Gearcase side: 35.002-35.013 mm (1.378-1.3785 in)

Tightening torque

Tightening torque specs
Cylinder head screw: 200.0-210.0 Nm (20.4-21.4 kgf·m; 147.6-155 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 5.0 L (5.28 US. qt, 4.4 Imp. qt.)
Fuel system
Injection timing: 24° B.T.D.C.
Fuel injection pressure 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Coolant capacity: 6.9 liters (7.3 US.qts, 6.1 Imp. qts)
Electrical system
Battery: 12V, 65Ah or equivalent
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