The Kubota D640 is a 638 cc (38.9 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Kubota for general-purpose applications.
The cylinder bore is 66.0 mm (2.60 in) and the piston stroke is 62.2 mm (2.45 in).
This engine produced 16.0 PS (11.8 KW; 15.8 HP) at 3,200 rpm of horsepower.
The Kubota D640 features:
- Spherical type combustion chamber
- Fuel injection pump
- Centrifugal governor
- Forced lubrication by trochoid pump
- Water cooling system with pressurized radiator
- Electric starter (12V, 0.7 kW)
General information
Engine Specifications | |
Engine model | D640 |
Engine type | 4-stroke, OHV, three-cylinders |
Displacement | 638 cm3, (38.9 cu·in) |
Max. horsepower | 16.0 PS (11.8 KW; 15.8 HP) at 3,200 rpm |
Max. torque | – |
Cooling system | Liquid-cooled with pressurized radiator |
Lubricating system | Forced lubrication by trochoid pump |
Fuel system | Injection pump |
Injection type | Indirect injection |
Fuel used | Diesel fuel No.2-D |
Starting system | Electric starter (12V, 0.7 kW) |
Governor | Centrifugal governor |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | – |
Cylinder bore: | 66.0 mm (2.60 in) |
Piston stroke: | 62.2 mm (2.45 in) |
Cylinder internal diameter (standard): | 66.130-65.960 mm (2.6044-2.5984 in) |
Piston skirt outer diameter (standard): | 65.906 mm (2.5957 in) |
Number of piston rings (compression / oil): | 2/1 |
Ring end gap (Top): | 0.430-0.885 mm (0.0169-0.0348 in) |
Ring end gap (Second): | 0.430-0.885 mm (0.0169-0.0348 in) |
Crankshaft main journal diameter: | 39.934-39.950 mm (1.5722-1.5728 in) |
Crankpin journal diameter: | 33.959-33.975 mm (1.337-1.3376 in) |
Crankshaft center distance: | 31.1 mm (1.225 in) |
Cylinder head | |
Valve arrangement: | OHV, gear driven |
Valves: | 6 (2 valves in total) |
Valve head diameter (INTAKE): | 26.00 mm (1.0236 in) |
Valve head diameter (EXHAUST): | 22.50 mm (0.8858 in) |
Valve steam diameter (INTAKE): | 5.980 mm (0.2354 in) |
Valve steam diameter (EXHAUST): | 5.980 mm (0.2354 in) |
Service Data
Valve clearance | |
Intake valve clearance: | 0.145-0.185 mm (0.0057-0.0073 in) |
Exhaust valve clearance: | 0.145-0.185 mm (0.0057-0.0073 in) |
Oil system | |
Lubrication system: | Forced lubrication by trochoid pump |
Oil type: | API CC or CD |
Recommended oil: | SAE 30, 10W-30 |
Oil capacity: | 3.0 liters (3.17 US.qts, 2.64 Imp. qts) |
Oil filter type: | Full flow paper filter (cartridge) |
Cooling system | |
Type | Liquid-cooled with pressurized radiator |
Coolant capacity | 2.1 liters (2.22 US.qts, 1.85 Imp. qts) |
Fuel system | |
Type: | Injection pump |
Electrical system | |
Battery: | 12V, 35AH or equivalent |
Starting motor | Electric starter (12V, 0.7 kW) |
Applications
Manufacturer or Brand | Models |
Lawn tractors | |
Kubota | G6200 |
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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