Kubota ZB400

Kubota ZB400The Kubota ZB400 is a 400 cc, (24.4 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion diesel engine, manufactured by Kubota since 1980 for general-purpose applications.

The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 62.2 mm (2.45 in).

The Kubota ZB400 engine produced 10.6 PS (7.83 KW; 10.5 HP) at 3,200 rpm of gorss horsepower and 9.1 PS (6.71 KW; 9.0 HP) at 3,200 rpm of net intermittent power.

The Kubota ZB400 features:

  • Three Vortex Combustion System (TVCS)
  • Fuel injection pump
  • Centrifugal governor
  • Forced lubrication by trochoid pump
  • Water cooling system with pressurized radiator
  • Electric starter (12V, 0.8 kW)

General information

Engine Specifications
Engine modelZB400
Engine type4-stroke, horizontal, two-cylinders
Displacement400 cm3, (24.4 cu·in)
Max. horsepower Gross (intermittent): 10.6 PS (7.83 KW; 10.5 HP) at 3,200 rpm
Net (intermittent): 9.1 PS (6.71 KW; 9.0 HP) at 3,200 rpm
Net (continuous): 8.1 PS (5.97 KW; 8.0 HP) at 3,200 rpm
Max. torque
Cooling systemLiquid-cooled with pressurized radiator
Lubricating systemForced lubrication by trochoid pump
Fuel systemInjection pump
Injection typeIndirect injection
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 0.8 kW)
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W x H):460 x 404 x 462 mm (18.1 x 15.9 x 18.2 in)
Weight60 kg (132.2 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore:64.0 mm (2.52 in)
Piston stroke:62.2 mm (2.45 in)

Service Data

Oil system
Lubrication system:Forced lubrication by trochoid pump
Oil type:API CC or better
Recommended oil:SAE 30, 10W-30
Oil capacity:2.0 liters (2.11 US.qts, 1.76 Imp. qts)
Cooling system
TypeLiquid-cooled with pressurized radiator
Coolant capacity1.9 liters (2.0 US.qts, 1.67 Imp. qts)
Electrical system
Battery:12V, 35AH or equivalent
Starting motorElectric starter (12V, 0.8 kW)
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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