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Kubota D640 Specifications
| Engine Model: Kubota D640 |
| Engine Type: 4-cycle vertical 3-cylinder water-cooled diesel engine |
| Total Displacement: 38.9 cu.in (0.65 L) |
| Rated Engine Power: 16 Hp (11.8 kW) at 3200 rpm |
| Fuel System: Fuel injection pump |
Engine Model .............. Kubota D640
Engine Type .............. Vertical, water-cooled, 4 cycle diesel
Number of Cylinders .............. 3
Displacement, cu in (L) .............. 38.9 (0.638)
Cylinder Bore, in (mm) .............. 2.60 (66.0)
Piston Stroke, in (mm) .............. 2.45 (62.2)
Aspiration Type .............. Naturally aspirated
Rated Engine Power, hp (kW) .............. 16.0 (11.8)
Rated Engine Speed, rpm .............. 3200
Firing Order .............. 1-2-3
Fuel System .............. Injection pump
Lubrication System .............. Forced lubrication by trochoid pump
Oil filter type .............. Full flow paper filter (cartridge)
Cooling System .............. Water with pressurized radiator
Pre-Heating .............. Glow plugs
Coolant Capacity, qts (L) .............. 2.2 (2.1)
Electrical System Rating, Volts .............. 12
Starting Motor .............. 12V, 0.8 kW
Battery Rating .............. 12V, 45 AH
Overall Length, mm (in) .............. 377 (14.8)
Overall Width, mm (in) .............. 425 (16.7)
Overall Height, mm (in) .............. 477 (18.8)
Dry weight, kg (lbs.) .............. 61.3 (135)
Cylinder Liner Inside Diameter (Minimum), in (mm) .............. 2.5984 (65.960)
Cylinder Liner Inside Diameter (Maximum), in (mm) .............. 2.6044 (66.130)
Piston Outside Diameter, in (mm) .............. 2.5957 (65.906)
Piston Ring End Gap, in (mm) .............. 0.017-0.035 (0.431-0.886)
Crankshaft End Play, in (mm) .............. 0.012 (0.304)
Crankshaft Journal Outside Diameter, in (mm) .............. 1.5722-1.5728 (39.934-39.950)
Crankshaft Bearing Inside Diameter, in (mm) .............. 1.5715-1.5764 (39.984-40.040)
Crankshaft Journal to Bearing Oil Clearance, in (mm) .............. 0.0013-0.0042 (0.034-0.106)
Crankpin to Crankpin Bearing Oil Clearance, in (mm) .............. 0.0008-0.0020 (0.020-0.051)
Crankpin Outside Diameter, in (mm) .............. 1.3370-1.3376 (33.959-33.975)
Crankpin Bearing Inside Diameter, in (mm) .............. 1.3389-1.3390 (33.995-34.010)
Intake Valve Clearance (Cold), in (mm) .............. 0.0057-0.0073 (0.145-0.185)
Exhaust Valve Clearance (Cold), in (mm) .............. 0.0057-0.0073 (0.145-0.185)
Exhaust Valve Head Diameter, in (mm) .............. 0.89 (22.50)
Intake Valve Head Diameter, in (mm) .............. 1.03 (26.00)
Exhaust Valve Stem Outside Diameter, in (mm) .............. 0.2354 (5.980)
Intake Valve Stem Outside Diameter, in (mm) .............. 0.2354 (5.980)
Intake Valve Guide Inside Diameter, in (mm) .............. 0.2372 (6.030)
Exhaust Valve Guide Inside Diameter, in (mm) .............. 0.2372 (6.030)
Exhaust Valve Seat Angle, deg .............. 45
Intake Valve Seat Angle, deg .............. 45
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