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Kubota D722 Specifications
The Kubota D722 is a 0.7 L (719 cc, 43.9 cubic inches) 3-cylinder water-cooled naturally aspirated diesel engine manufactured by Kubota. The Kubota D722 engine has a spherical type сombustion сhamber with glow plug, Bosch MD mini fuel injection pump, and Bosch throttle type injection nozzle. The compression ratio rating is 23.0:1 or 23.5:1. Cylinder bore is 67.0 mm (2.64 in) and piston stroke is 68.0 mm (2.68 in). The D722 diesel engine produced 21.2 PS (15.6 kW; 20.9 HP) at 3,600 rpm of maximum power and 45.8 Nm (4.67 kgm; 33.8 ft-lb) at 2,600 rpm of torque. Engine code identification: D - Three-cylinder, 72 - Approximate displacement 720 cc, 2 - Kubota super mini series.
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| General Technical Data |
Engine Model .............. Kubota D722
Engine Type .............. Vertical, water-cooled, 4-stroke diesel
Number of cylinders .............. 3
Bore, mm (in) .............. 67.0 (2.64)
Stroke, mm (in) .............. 68.0 (2.68)
Total displacement, cm3 (cu. in) .............. 719 (43.9)
Gross power, kw (hp) .............. 14.9 (20.0)
Net power, kw (hp) .............. 14.0 (18.8)
Maximum speed, rpm .............. 3800
Idling speed, rpm .............. 900-1000
Combustion Chamber .............. Spherical type (E-TVCS)
Direction of rotation .............. Counter-clockwise
Compression ratio .............. 23.5:1
Firing order .............. 1-2-3
| Fuel System |
Fuel injection pump .............. Bosch MD type mini pump
Injection nozzle .............. Bosch "Throttle" type
Injection timing, deg (rad) .............. 21 (0.37) before T.D.C.
Injection pressure, MPa (psi) .............. 13.73 (1991)
Governor .............. All speed mechanical governor
| Lubricating System |
Lubricating system .............. Forced lubrication by trochoid pump
Oil pressure indicating .............. Electrical type switch
Oil filter .............. Full flow paper filter (cartridge type)
| Electrical System |
Starting system .............. Electric starting with starter
Starting Motor .............. 12V, 0.8 kW
Starting support device .............. By glow plug in combustion chamber
Battery .............. 12V, 36 AH
Charging Alternator .............. 12V, 150W
Stator, Resistance .............. Less than 1.0 ohm
Rotor, Resistance .............. 2.9 ohm
Slip Ring O.D .............. 14.4 mm (0.567 in)
Brush Length .............. 10.0 mm (0.394 in)
| Dimensions and Weight |
Overall Length, mm (in) .............. 426 (16.8)
Overall Width, mm (in) .............. 389 (15.3)
Overall Height, mm (in) .............. 520 (20.5)
Dry weight, kg (lbs.) .............. 63.0 (139)
| Cylinder Block |
Cylinder Liner I.D .............. 67.000-67.019 mm (2.6378-2.6385 in)
Cylinder Liner (Oversize 0.25 mm) I.D .............. 67.250-67.269 mm (2.6477-2.6483 in)
Camshaft Alignment .............. 0.01 mm (0.0004 in)
Cam Height (Intake and Exhaust) .............. 26.88 mm (1.058 in)
Idle Gear Shaft to Idle Gear Bushing Oil Clearance .............. 0.020-0.084 mm (0.00079-0.0033 in)
Idle Gear Shaft O.D .............. 19.967-19.980 mm (0.78611-0.78661 in)
Idle Gear Bushing I.D .............. 20.000-20.051 mm (0.78740-0.78940 in)
Piston Pin Bore I.D .............. 20.000-20.013 mm (0.78741-0.78791 in)
Piston Pin to Small End Bushing Oil Clearance .............. 0.014-0.038 mm (0.00056-0.0014 in)
Piston Pin O.D .............. 20.002-20.011 mm (0.78748-0.78783 in)
| Cylinder Head and Valves |
Valve Clearance (Cold) .............. 0.145-0.185 mm (0.00571-0.00728 in)
Compression Pressure .............. 2.85-3.23 MPa (413-469 psi)
Top Clearance .............. 0.50-0.70 mm (0.020-0.027 in)
Cylinder Head Surface, Flatness .............. 0.05 mm (0.002 in)
Valve Recessing (Intake and Exhaust) .............. 0.10-0.10 mm (0.0039-0.0039 in)
Valve Stem to Valve Guide Clearance .............. 0.030-0.057 mm (0.0012-0.0022 in)
Valve Stem O.D .............. 5.968-5.980 mm (0.2350-0.2354 in)
Valve Guide I.D .............. 6.010-6.025 mm (0.2367-0.2372 in)
Rocker Arm Shaft to Rocker Arm Oil Clearance .............. 0.016-0.045 mm (0.00063-0.0017 in)
Rocker Arm Shaft O.D .............. 10.473-10.484 mm (0.41233-0.41275 in)
Rocker Arm I.D .............. 10.500-10.518 mm (0.41339-0.41409 in)
Push Rod Alignment .............. 0.25 mm (0.0098 in)
| Timing Gear |
Crank Gear to Idle Gear Backlash .............. 0.0430-0.124 mm (0.00170-0.00488 in)
Idle Gear to Cam Gear Backlash .............. 0.0470-0.123 mm (0.00185-0.00484 in)
Idle Gear to Injection Pump Gear Backlash .............. 0.0460-0.124 mm (0.00182-0.00488 in)
Crank Gear to Oil Pump Drive Gear Backlash .............. 0.0410-0.123 mm (0.00162-0.00484 in)
Idle Gear Side Clearance .............. 0.20-0.51 mm (0.0079-0.020 in)
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