The Kubota Z500-B is a 0.5 L (508 cc, 31.0 cu-in) straight-two, water-cooled naturally aspirated diesel engine from Kubota 70 mm series.
The Kubota Z500-B engine has a spherical type сombustion сhamber with glow plug, Bosch K-type mini fuel injection pump, and Bosch throttle type injection nozzle. The compression ratio rating is 22.0:1. The cylinder bore and the piston stroke are 68.0 mm (2.68 in) and 70.0 mm (2.76 in), respectively.
The Z500-B diesel engine produced 11.2 PS (8.2 kW; 11.0 HP) at 3,000 rpm of gross (intermittent) horsepower and 28.0 N·m (2.9 kg·m, 20.6 ft·lb) at 1,800 rpm of torque.
The breakdown of the engine code is as follows:
- Z – 2-cylinders
- 5 – Approximate displacement 500 cc
General information
| Engine Specifications | |
| Engine code | Z500-B |
| Layout | Straight-2, vertical diesel engine |
| Fuel type | Diesel fuel No.2-D |
| Production | – |
| Displacement | 0.5 L, 508 cm3 (31.0 cu in) |
| Max. Horsepower |
Net (continuous): 8.6 PS (6.3 KW; 8.5 HP) at 3,000 rpm Net (intermittent): 10.1 PS (7.46 KW; 10.0 HP) at 3,000 rpm Gross (intermittent): 11.2 PS (8.2 kW; 11.0 HP) at 3,000 rpm |
| Torque output | 28.0 N·m (2.9 kg·m, 20.6 ft·lb) at 1,800 rpm |
| Injection type | Indirect injection |
| Cooling system | Liquid-cooled |
| Fuel injection pump | Bosch K-type type mini fuel injection pump |
| Fuel nozzle | Bosch throttle type |
| Starting system | Electric starting with 12V (0.8 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): | 520 x 380 x 504 mm (20.5 x 15.0 x 19.8 in) |
| Weight | 69.7 kg (153.7 lbs) |
Cylinder block
| Cylinder block | ||
| Compression ratio: | 22.0:1 | |
| Cylinder bore: | 68.0 mm (2.68 in) | |
| Piston stroke: | 70.0 mm (2.76 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder inner diameter: | 68.000-68.019 mm (2.6772-2.6779 in) | |
| Piston skirt diameter | – | |
| Piston ring side clearance: | Second | 0.085-0.112 mm (0.0033-0.0044 in) |
| Oil | 0.020-0.055 mm (0.0008-0.0022 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 | 0.250-0.400 mm (0.0098-0.0157 in) | |
| Piston pin outer diameter | 20.002-20.011 mm (0.7875-0.7878 in) | |
| Crankshaft main journal diameter: | 43.934-43.950 mm (1.7297-1.7303 in) | |
| Crankpin diameter: | 36.959-36.975 mm (1.4551-1.4557 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 seat width: | INTAKE | 2.120 mm (0.0835 in) |
| EXHAUST | 2.120 mm (0.0835 in) | |
| Valve stem diameter: | INTAKE | 6.960-6.975 mm (0.274-0.2746 in) |
| EXHAUST | 6.960-6.975 mm (0.274-0.2746 in) | |
| Valve spring free length: | INTAKE | 35.100-34.800 mm (1.3819-1.3701 in) |
| EXHAUST | 35.100-34.800 mm (1.3819-1.3701 in) | |
| Camshaft lobe height: | INTAKE | 26.880 mm (1.0583 in) |
| EXHAUST | 26.880 mm (1.0583 in) | |
| Camshaft journal diameter: | 32.934-32.950 mm (1.2966-1.2972 in) | |
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 | 3.09 MPa, 31.5 kgf/cm2, 448 psi |
| Cooling system system | |
| Coolant capacity: | 3.0 liters (3.2 US.qts, 2.6 Imp. qts) |
| Oil system | |
| Recommended engine oil | CC or higher |
| SAE Viscosity Number | SAE 10W-30, 10W-40 |
| Engine oil capacity | 2.55 L (2.69 US. qt, 2.24 Imp. qt.) |
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