Kubota ZL600

Kubota ZL600The Kubota ZL600 is a 0.6 L (577 cc, 35.21 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.

A 70.0 mm (2.76 in) cylinder bore and 75.0 mm (2.95 in) piston stroke give the ZL600 engine a total of 577 cc of displacement.

The ZL600 engine produced 12.6 PS (9.3 KW; 12.5 HP) at 2,700 rpm of horsepower and 33.0 N·m (3.3 kg·m, 24.3 ft·lb) at 2,000 rpm of maximum torque.

The Kubota ZL600 features:

  • Spherical type combustion chamber
  • Bosch PFR fuel injection pump
  • Bosch DN12SD12 injection nozzle
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump lubrication system
  • Liquid cooling system
  • Electric starter (12V, 0.8 kW)

General information

Engine Specifications
Engine modelZL600
Engine type4-stroke, vertical, two-cylinders
Displacement577 cm3, (35.21 cu·in)
Max. horsepower12.6 PS (9.3 KW; 12.5 HP) at 2,700 rpm
Max. torque33.0 N·m (3.3 kg·m, 24.3 ft·lb) at 2,000 rpm
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberSpherical type
Fuel injection pumpBosch PFR fuel injection pump
Injection typeIndirect injection
Injection nozzleBosch DN12SD12
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 0.8 kW)
Starting support deviceGlow plug in combustion chamber
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)
Dry weight

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore:70.0 mm (2.76 in)
Piston stroke:77.0 mm (2.95 in)
Number of piston rings (compression / oil):2/1
Number of main bearings:3
Cylinder head
Valves:2,(4 valves in total)

Service Data

Maximum speed:3,900 rpm
Valve clearance
Intake valve clearance:0.200-0.250 mm (0.0079-0.0098 in)
Exhaust valve clearance:0.200-0.250 mm (0.0079-0.0098 in)
Oil system
Lubrication system:Forced lubrication by pump
Oil type:API CC or better
Oil capacity:2.0 liters (0.5 US gal, 0.4 Imp. gal)
Oil filter:Full flow paper filter
Fuel system
Fuel injection pumpBosch PFR pump
Injection nozzleBosch DN12SD12 type
Injection timing:26° B.T.D.C.
Fuel injection pressure13.73 MPa (140 kgf/cm2, 1991 psi)
Cooling system
Type:Pressurized radiator, forced circulation with water pump (not included in the basic engine)
Thermostat’s valve opening temperature:80.5-83.5°C (176.9-182.3°F)
Temperature at which thermostat completely opens:95°C (203°F)
Coolant capacity:3.0 liters (3.2 US.qts, 2.6 Imp. qts)
Electrical system
Battery:12V, 65AH 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.

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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.

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