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
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
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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.