Kubota Z1100

Kubota Z1100The Kubota Z1100 is an 1.1 L (1,070 cc, 65.3 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 88.0 mm (3.46 in) and 88.0 mm (3.46 in), respectively. Compression ratio rating is 20.0:1.

The Kubota Z1100 diesel engine produced 21.1 PS (15.5 kW; 21.0 HP) at 2,700 rpm of horsepower and 60.0 Nm (6.12 kg·m; 44.28 ft·lb) at 1,600 rpm of peak torque.

The Kubota Z1100 features:

  • Fuel injection pump
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump
  • Liquid cooling system
  • Electric starter
  • Charging alternator

General information

Engine Specifications
Engine modelZ1100A
Engine type4-stroke, vertical, two-cylinders
Displacement1,070 cm3, (65.3 cu·in)
Max. horsepower21.1 PS (15.5 kW; 21.0 HP) at 2,700 rpm
Max. torque60.0 Nm (6.12 kg·m; 44.28 ft·lb) at 1,600 rpm
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamber
Fuel systemFuel injection pump
Injection typeIndirect injection
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)397 x 447 x 543 mm (15.6 x 17.6 x 21.4 in)
Dry weight92.0 kg (202.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:20.0:1
Cylinder bore:88.0 mm (3.46 in)
Piston stroke:88.0 mm (3.46 in)
Cylinder internal diameter (standard):88.000-88.020 mm (3.4646-3.4653 in)
Piston skirt outer diameter (standard):87.900-87.920 mm (3.4606-3.4614 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:28.100 mm (1.1063 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):0.300-0.500 mm (0.0118-0.0197 in)
Ring end gap (Second):0.300-0.500 mm (0.0118-0.0197 in)
Number of main bearings:3
Crankshaft main journal diameter
(flywheel end) :
80.020-80.039 mm (3.1504-3.1511 in)
Crankshaft main journal diameter
(timing gear end) :
60.011-60.024 mm (2.3626-2.3631 in)
Crankpin journal diameter:53.950-53.970 mm (2.124-2.1248 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):8.960-8.975 mm (0.3528-0.3533 in)
Valve steam diameter (EXHAUST):8.960-8.975 mm (0.3528-0.3533 in)
Valve spring free length (INTAKE):47.5 mm (1.8701 in)
Valve spring free length (EXHAUST):47.5 mm (1.8701 in)
Camshaft journal diameter
(flywheel side):
19.983-20.110 mm (0.7867-0.7917 in)
Camshaft journal diameter
(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)

Service Data

Maximum speed:2,850 rpm
Idle speed:600-650 rpm
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
Lubrication system:Forced lubrication
Oil type:DS or DM
Recommended oil:SAE 80
Oil capacity:5.0 L (5.28 US. qt, 4.4 Imp. qt.)
Fuel system
Injection timing:25° B.T.D.C.
Fuel injection pressure13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type:Pressurized radiator, forced circulation with water pump
Coolant capacity:6.9 liters (7.3 US.qts, 6.1 Imp. qts)
Electrical system
Battery:12V, 65AH or equivalent


Manufacturer or BrandModels
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.

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