Kubota ZB400

Kubota ZB400The Kubota ZB400 is a 400 cc (24.4 cu·in) straight-two, water-cooled horizontal naturally aspirated diesel engine manufactured by Kubota since 1980.

The Kubota ZB400 engine used pre-combustion (TVCS) combustion method. The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 62.2 mm (2.45 in).

The ZB400 diesel 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 breakdown of the engine code is as follows:

  • Z – 2-cylinders
  • 400 – Approximate displacement 400 cc

General information

Engine Specifications
Engine codeZB400
LayoutStraight-2, horizontal diesel engine
Fuel typeDiesel fuel No.2-D
Displacement0.4 L, 400 cm3 (24.4 cu in)
Max. Horsepower Gross: 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
Torque output
Injection typeIndirect injection
Fuel systemFuel injection pump
Cooling systemWater with pressurized radiator
Starting systemElectric starting with 12V (0.8 kW) starter
Starting support device
GovernorCentrifugal mechanical governor
Power adderNone
Firing order1-2
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

Cylinder block
Compression ratio:
Cylinder bore:64.0 mm (2.52 in)
Piston stroke:62.2 mm (2.45 in)
Number of piston rings (compression / oil):2 / 1

Maintenance data

Oil system
Recommended engine oilСС or better
SAE Viscosity NumberSAE 10W-30, 10W-40
Engine oil capacity2.0 liters (2.11 US.qts, 1.76 Imp. qts)
Cooling system
TypeWater with pressurized radiator
Coolant capacity1.9 liters (2.0 US.qts, 1.67 Imp. qts)
Electrical system
Battery:12V, 35Ah or equivalent
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