The Kubota Z402-EB is a 400 cc (24.41 cu·in) straight-two, water-cooled naturally aspirated diesel engine manufactured by Kubota.
The Kubota Z402-EB engine has a spherical type сombustion сhamber with a glow plug. The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 62.2 mm (2.45 in). The compression ratio rating is 23.0:1.
The Z402-EB diesel engine produced 8.6 PS (6.3 KW; 8.4 HP) at 3,000 rpm of net intermittent power and 8.8 PS (6.5 KW; 8.7 HP) at 3,000 rpm of gross intermittent power.
The breakdown of the engine code is as follows:
- Z – 2-cylinders
- 402 – Approximate displacement 400 cc
- EB – Early industrial diesel
General information
| Engine Specifications | |
| Engine code | Z402-EB |
| Layout | Straight-2, vertical diesel engine |
| Fuel type | Diesel fuel No.2-D |
| Production | – |
| Displacement | 0.4 L, 400 cm3 (24.41 cu in) |
| Max. Horsepower | Net intermittent: 8.6 PS (6.3 KW; 8.4 HP) at 3,000 rpm Gross intermittent: 8.8 PS (6.5 KW; 8.7 HP) at 3,000 rpm |
| Torque output | – |
| Injection type | Indirect injection |
| Fuel system | Bosch MD type mini pump |
| Cooling system | Water with pressurized radiator |
| Starting system | Electric starting with 12V (1.2 kW) starter |
| Starting support device | Glow plug in combustion chamber |
| Governor | Centrifugal ball mechanical governor |
| Power adder | None |
| Firing order | 1-2 |
| Dimensions (L x W x H): | 314.5 x 380.4 x 449.1 mm (12.38 x 14.98 x 17.68 in) |
| Weight | 56 kg (123.5 Ibs) |
Cylinder block
| Cylinder block | ||
| Compression ratio: | 23.0:1 | |
| Cylinder bore: | 64.0 mm (2.52 in) | |
| Piston stroke: | 62.2 mm (2.45 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder inner diameter: | 64.000-64.019 mm (2.5199-2.5204 in) | |
| Piston skirt diameter | – | |
| Piston ring side clearance: | Second | 0.085-0.112 mm (0.0033 to 0.0044 in) |
| Oil | 0.040-0.080 mm (0.0016 to 0.0031 in) | |
| Piston ring end gap: | Top | 0.250-0.400 mm (0.0098-0.0157 in) |
| Second | 0.250-0.400 mm (0.0098-0.0157 in) | |
| Oil | 0.150-0.300 mm (0.0059-0.0117 in) | |
| Piston pin outer diameter | 20.002-20.011 mm (0.7875-0.7878 in) | |
| Crankshaft main journal diameter: | Bearing №1,3: 39.934-39.950 mm (1.5722-1.5728 in) Bearing №2: 43.934-43.950 mm (1.7297-1.7303 in) | |
| Crankpin diameter: | 33.959-33.975 mm (1.337-1.3376 in) | |
Cylinder head
| Cylinder head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 valves per cylinder) | |
| Valve timing: | INTAKE | Open: 20° B.T.D.C. Close: 45° A.B.D.C. |
| EXHAUST | Open: 50° B.B.D.C. Close: 15° A.T.D.C. | |
| Valve head diameter: | INTAKE | – |
| EXHAUST | – | |
| Valve stem diameter: | INTAKE | 5.968-5.980 mm (0.2349 to 0.2354 in) |
| EXHAUST | 5.968-5.980 mm (0.2349 to 0.2354 in) | |
| Valve seat angle: | INTAKE | 45° |
| EXHAUST | 45° | |
Tightening torque
| Tightening torque specs | |
| Cylinder head screws (M8x1.25): | 37.2-42.1 Nm (3.8-4.3 kgf-m, 27.5-31.1 lb-ft) |
| Main bearing case screws Kubota 1 (M6x1.0): | 12.7-15.7 Nm (1.3-1.6 kgf-m, 9.4-11.6 lb-ft) |
| Main bearing case screws 1 (Flywheel side) (M8x1.25): | 23.5-27.4 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft) |
| Main bearing case screws 2 (M7x1.0): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Connecting rod screws (M7x0.75): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
| Flywheel screws (M10x1.25): | 53.9-58.8 Nm (5.5-6.0 kgf-m, 39.8-43.4 lb-ft) |
| Rocker arm bracket nuts (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Bearing case cover screws (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Idle gear shaft screws (M6x1.0): | 9.8-11.5 Nm (1.0-1.15 kgf-m, 7.2-8.3 lb-ft) |
| Crankshaft end bolt (M12x1.5): | 117.6-127.4 Nm (12.0-13.0 kgf-m, 86.4-93.6 lb-ft) |
| Glow plugs (M8x1.0): | 7.8-14.7 Nm (0.8-1.5 kgf-m, 5.8-10.8 lb-ft) |
Maintenance data
| Valve clearance | |
| Intake valve | 0.145-0.185 mm (0.0057-0.0073 in) |
| Exhaust valve | 0.145-0.185 mm (0.0057-0.0073 in) |
| Compression pressure | |
| Standard | 2.84-3.23 MPa (29.0-33.0 kgf/cm2, 412-469 psi) |
| Oil system | |
| Recommended engine oil | CD or CE |
| SAE Viscosity Number | SAE 10W-30, 10W-40 |
| Engine oil capacity | 1.9 liters (2.0 US.qts, 1.67 Imp. qts) |
| Oil filter type | Full-flow paper filter (cartridge type) |
| Cooling system | |
| Type | Water with pressurized radiator |
| Coolant capacity | – |
| Electrical system | |
| Battery: | 12V, CCA 600A or equivalent |
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