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 and 60.0 Nm (6.12 kg·m; 44.28 ft·lb) at 1,600 rpm of torque.

The breakdown of the engine code is as follows:

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

General information

Engine Specifications
Engine codeZ1100A
LayoutStraight-2, vertical diesel engine
Fuel typeDiesel fuel No.2-D
Displacement1.1 L, 1,070 cm3 (65.3 cu in)
Max. Horsepower21.1 PS (15.5 kW; 21.0 HP) at 2,700 rpm
Torque output60.0 Nm (6.12 kg·m; 44.28 ft·lb) at 1,600 rpm
Injection typeIndirect injection
Cooling systemLiquid-cooled
Fuel systemFuel injection pump
Fuel nozzle
Starting systemElectric starting with 12V starter
Starting support device
GovernorCentrifugal ball mechanical governor
Power adderNone
Firing order1-2
Dimensions (L x W x H):397 x 447 x 543 mm (15.6 x 17.6 x 21.4 in)
Weight92.0 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:Second0.065-0.090 mm (0.0026-0.0035 in)
Oil0.020-0.060 mm (0.0008-0.0024 in)
Piston ring end gap:Top0.300-0.500 mm (0.0118-0.0197 in)
Second0.300-0.500 mm (0.0118-0.0197 in)
Piston pin outer diameter28.100 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:INTAKE1.500 mm (0.060 in)
EXHAUST1.500 mm (0.060 in)
Valve stem diameter:INTAKE8.960-8.975 mm (0.3528-0.3533 in)
EXHAUST8.960-8.975 mm (0.3528-0.3533 in)
Valve spring free length:INTAKE47.5 mm (1.8701 in)
EXHAUST47.5 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 valve0.20-0.25 mm (0.0079-0.0098 in)
Exhaust valve0.20-0.25 mm (0.0079-0.0098 in)
Oil system
Recommended engine oilDS or DM
SAE viscosity numberSAE 80
Engine oil capacity5.0 L (5.28 US. qt, 4.4 Imp. qt.)
Fuel system
Injection timing:24° B.T.D.C.
Fuel injection pressure13.73-14.71 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
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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