Kubota Z1300

Kubota Z1300The Kubota Z1300 is a 1.3 L (1,272 cc, 77.6 cu·in) straight-two, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota for general-purpose applications.

A 90.0 mm (3.54 in) cylinder bore and 100.0 mm (3.94 in) piston stroke give the Z1300 engine a total of 1272 cc of displacement. The compression ratio rating is 21.5:1.

This engine produced 26.4 PS (19.4 kW; 26.0 HP) at 2,600 rpm of horsepower and 79.7 N·m (8.1 kg·m, 58.7 ft·lb) at 1,600 rpm of torque.

The breakdown of the engine code is as follows:

  • Z – 2-cylinders
  • 1300 – Approximate displacement 1300 cc

General information

Engine Specifications
Engine codeZ1300
LayoutStraight-2, vertical diesel engine
Fuel typeDiesel fuel No.2-D
Production
Displacement1.3 L, 1,272 cm3 (77.6 cu in)
Max. Horsepower26.4 PS (19.4 kW; 26,0 HP) at 2,600 rpm
Torque output79.7 N·m (8.1 kg·m, 58.7 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):400 x 455 x 554 mm (15.7 x 17.9 x 21.8 in)
Weight115.0 kg (253.5 lbs)

Cylinder block

Cylinder block
Compression ratio:21.5:1
Cylinder bore:90.0 mm (3.54 in)
Piston stroke:100.0 mm (3.94 in)
Number of piston rings (compression / oil):2 / 1
Cylinder inner diameter:90.000 mm (3.5433 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:62.930-62.940 mm (2.4776-2.4779 in)
Crankpin diameter:58.760-58.800 mm (2.3134-2.315 in)

Cylinder head

Cylinder head
Valve Arrangement:OHV, gear drive
Valves:4 (2 valves per cylinder)
Valve timing:INTAKE
EXHAUST
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: Front bearing: 50.000-50.030 mm (1.9685-1.9697 in)
Rear bearing: 32.000-32.030 mm (1.2598-1.261 in)

Tightening torque

Tightening torque specs
Cylinder head screw:170.0-184.0 Nm (17.3-18.8 kgf·m; 125.5-135.8 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 capacity4.8 L (5.1 US. qt, 4.2 Imp. qt.)
Fuel system
Injection timing:20° B.T.D.C.
Fuel injection pressure11.73 MPa (120 kgf/cm2, 1700 psi)
Cooling system
Coolant capacity:6.9 liters (7.3 US.qts, 6.1 Imp. qts)
Electrical system
Battery:12V, 110Ah 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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