The 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 code | ZB400 |
| Layout | Straight-2, horizontal diesel engine |
| Fuel type | Diesel fuel No.2-D |
| Production | – |
| Displacement | 0.4 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 type | Indirect injection |
| Fuel system | Fuel injection pump |
| Cooling system | Water with pressurized radiator |
| Starting system | Electric starting with 12V (0.8 kW) starter |
| Starting support device | – |
| Governor | Centrifugal mechanical governor |
| Power adder | None |
| Firing order | 1-2 |
| Dimensions (L x W x H): | 460 x 404 x 462 mm (18.1 x 15.9 x 18.2 in) |
| Weight | 60 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 oil | СС or better |
| SAE Viscosity Number | SAE 10W-30, 10W-40 |
| Engine oil capacity | 2.0 liters (2.11 US.qts, 1.76 Imp. qts) |
| Cooling system | |
| Type | Water with pressurized radiator |
| Coolant capacity | 1.9 liters (2.0 US.qts, 1.67 Imp. qts) |
| Electrical system | |
| Battery: | 12V, 35Ah or equivalent |
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