Kubota Z1300

Kubota Z1300The Kubota Z1300 is an 1.3 L (1,272 cc, 77.6 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 90.0 mm (3.54 in) and 100.0 mm (3.94 in), respectively. Compression ratio rating is 21.5:1.

The Kubota Z1300 diesel 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 Kubota Z1300 features:

  • Fuel injection pump
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump
  • Liquid cooling system
  • Electric starter 12V, 2.0 kW
  • Charging alternator

General information

Engine Specifications
Engine modelZ1300
Engine type4-stroke, vertical, two-cylinders
Displacement1,272 cm3, (77.6 cu·in)
Max. horsepower26.4 PS (19.4 kW; 26.0 HP) at 2,600 rpm
Max. torque79.7 N·m (8.1 kg·m, 58.7 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 12V, 2.0 kW
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)400 x 455 x 554 mm (15.7 x 17.9 x 21.8 in)
Dry weight115.0 kg (253.5 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:21.5:1
Cylinder bore:90.0 mm (3.54 in)
Piston stroke:100.0 mm (3.94 in)
Cylinder internal diameter (standard):90.000 mm (3.5433 in)
Piston skirt outer diameter (standard):89.900-89.920 mm (3.5394-3.5402 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:62.930-62.940 mm (2.4776-2.4779 in)
Crankpin journal diameter:58.760-58.800 mm (2.3134-2.315 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 (front bearing):50.000-50.030 mm (1.9685-1.9697 in)
Camshaft journal diameter (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)

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:4.8 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
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, 110AH 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.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

Be the first to comment

Leave a Reply

Your email address will not be published.