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Kubota D902 Specifications
The Kubota D902 is a 0.9 L (898 cc, 54.8 cubic inches) 3-cylinder water-cooled naturally aspirated vertical diesel engine manufactured by Kubota. The Kubota D902 engine has a spherical type сombustion сhamber with glow plug, Bosch MD mini fuel injection pump, and Bosch throttle type injection nozzle. It has a 72.0 mm (2.83 in) cylinder bore and a 73.6 mm (2.9 in) piston stroke. The compression ratio rating is 24.0:1. The D902 diesel engine produced 25.2 PS (18.5 kW; 24.8 HP) at 3,600 rpm of maximum power and 54.4 Nm (5.55 kgm; 40.15 ft-lb) at 2,400 rpm of torque. Engine code identification: D - Three-cylinder, 90 - Approximate displacement 900 cc, 2 - Kubota super mini series.
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| General Technical Data |
Engine Model .............. Kubota D902
Engine Type .............. Vertical, water-cooled, 4-stroke diesel
Number of cylinders .............. 3
Bore, mm (in) .............. 72.0 (2.83)
Stroke, mm (in) .............. 73.6 (2.90)
Total displacement, cm3 (cu. in) .............. 898 (54.8)
Gross power, kw (hp) .............. 18.5 (24.8)
Net power, kw (hp) .............. 17.5 (23.5)
Maximum speed, rpm .............. 3800
Idling speed, rpm .............. 900-1000
Combustion Chamber .............. Spherical type (E-TVCS)
Direction of rotation .............. Counter-clockwise
Compression ratio .............. 24:1
Firing order .............. 1-2-3
| Fuel System |
Fuel injection pump .............. Bosch MD type mini pump
Injection nozzle .............. Bosch "Throttle" type
Injection timing, deg (rad) .............. 20 (0.35) before T.D.C.
Injection pressure, MPa (psi) .............. 13.73 (1991)
Governor .............. All speed mechanical governor
Injection Pump Timing (3600 rpm) .............. 0.332-0.367 rad (19-21 deg) before T.D.C.
Pump Element Fuel, Tightness .............. 13.73 MPa (1991 psi)
Injection Nozzle Pressure .............. 13.73-14.70 MPa (1992-2133 psi)
| 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, 1.2 kW
Starting support device .............. By glow plug in combustion chamber
Battery .............. 12V, 52 AH
Charging Alternator .............. 12V, 480W
| Dimensions and Weight |
Overall Length, mm (in) .............. 467 (18.4)
Overall Width, mm (in) .............. 421 (16.6)
Overall Height, mm (in) .............. 544 (21.4)
Dry weight, kg (lbs.) .............. 72.0 (159)
| Cylinder Block |
Cylinder Liner I.D .............. 72.000-72.019 mm (2.8347-2.8353 in)
Cylinder Liner (Oversize 0.25 mm) I.D .............. 72.250-72.269 mm (2.8445-2.8452 in)
Camshaft Side Clearance .............. 0.15-0.31 mm 0.0059-0.012 in)
Camshaft Alignment .............. 0.01 mm (0.0004 in)
Piston Ring Gap, Top Ring .............. 0.20-0.35 mm (0.0079-0.013 in)
Piston Ring Gap, Second Ring .............. 0.35-0.50 mm (0.014-0.019 in)
Piston Ring Gap, Oil Ring .............. 0.20-0.35 mm (0.0079-0.013 in)
Connecting Rod Alignment .............. 0.05 mm (0.002 in)
Crankshaft Side Clearance .............. 0.15-0.31 mm (0.0059-0.012 in)
Crankshaft Alignment .............. 0.02 mm (0.0008 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)
| Cylinder Head and Valves |
Cylinder Head Surface Flatness .............. 0.05 mm (0.0019 in)
Valve Clearance (Cold) .............. 0.145-0.185 mm (0.00571-0.00728 in)
Compression Pressure .............. 3.53-4.02 MPa (512-583 psi)
Valve Face (Intake and Exhaust), Angle .............. 0.79 rad (45 deg)
Valve Seat (Intake and Exhaust), Angle .............. 0.79 rad (45 deg)
Valve Seat (Intake and Exhaust), Width .............. 2.12 mm (0.0835 in)
Intake Valve Timing, Open .............. 0.35 rad (20 deg) before T.D.C
Intake Valve Timing, Close .............. 0.79 rad (45 deg) after B.D.C
Exhaust Valve Timing, Open .............. 0.87 rad (50 deg) before B.D.C
Exhaust Valve Timing, Close .............. 0.26 rad (15 deg) after T.D.C
Tappet to Tappet Guide, Oil Clearance .............. 0.016-0.052 mm (0.00063-0.0020 in)
Tappet O.D .............. 17.966-17.984 mm (0.70733-0.70803 in)
Tappet Guide I.D .............. 18.000-18.018 mm (0.70867-0.70937 in)
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