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 code Z1300
Layout Straight-2, vertical diesel engine
Fuel type Diesel fuel No.2-D
Displacement 1.3 L, 1,272 cm3 (77.6 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 26.4 PS (19.4 kW; 26,0 HP) at 2,600 rpm
Torque output 79.7 N·m (8.1 kg·m, 58.7 ft·lb) at 1,600 rpm
Firing order 1-2
Dimensions (L x W x H): 400 x 455 x 554 mm (15.7 x 17.9 x 21.8 in)
Weight 115.0 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: 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: 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
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: 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 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 4.8 L (5.1 US. qt, 4.2 Imp. qt.)
Fuel system
Injection timing: 20° B.T.D.C.
Fuel injection pressure 11.73 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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