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Kubota D782 Specifications
The Kubota D782 is a 0.78 L (778 cc, 47.5 cubic inches) 3-cylinder water-cooled naturally aspirated diesel engine manufactured by Kubota. The Kubota D782 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 24.0:1. Cylinder bore is 67.0 mm (2.64 in) and the piston stroke is 73.6 mm (2.9 in). The D782 diesel engine produced 19.2 PS (14.1 kW; 18.9 HP) at 3,200 rpm of maximum power. Engine code identification: D - Three-cylinder, 78 - Approximate displacement 780 cc, 2 - Kubota super mini series.
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| General Technical Data |
Engine Model .............. Kubota D782
Engine Type .............. Vertical, water-cooled, 4-stroke diesel
Number of cylinders .............. Three
Bore, mm (in) .............. 67.0 (2.64)
Stroke, mm (in) .............. 73.6 (2.90)
Total displacement, cm3 (cu. in) .............. 778 (47.5)
Gross power, kw (hp) .............. 14.1 (18.9)
Net power, kw (hp) .............. 13.5 (18.1)
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) .............. 17 (0.30) before T.D.C.
Injection pressure, MPa (psi) .............. 13.73 (1991)
Governor .............. All speed mechanical governor
Injection Pump Timing (3200 rpm) .............. 0.279-0.314 rad (16-18) 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, 1.0 kW
Starting support device .............. By glow plug in combustion chamber
Battery .............. 12V, 36AH
Charging Alternator .............. 12V, 150 W
Commutator O.D .............. 30.0 mm (1.18 in)
Difference O.D .............. Less than 0.02 mm (0.0008 in)
Mica, Undercut .............. 0.50-0.80 mm (0.020-0.031 in)
Brush Length .............. 14.0 mm (0.551 in)
| Dimensions and Weight |
Overall Length, mm (in) .............. 427 (16.9)
Overall Width, mm (in) .............. 390 (15.4)
Overall Height, mm (in) .............. 521 (20.6)
Dry weight, kg (lbs.) .............. 63.5 (140)
| 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 Journal to Cylinder Bore Oil Clearance .............. 0.050-0.091 mm (0.0020-0.0035 in)
Camshaft Journal O.D .............. 32.934-32.950 mm (1.2967-1.2972 in)
Cylinder Block Bore I.D .............. 33.000-33.025 mm (1.2993-1.3001 in)
Small End Bushing I.D .............. 20.025-20.040 mm (0.78839-0.78897 in)
Piston Pin to Small End Bushing Oil Clearance .............. 0.015-0.075 mm (0.00059-0.0029 in)
Small End Bushing I.D .............. 20.026-20.077 mm (0.78843-0.79043 in)
Piston Ring Groove Clearance (Second Ring) .............. 0.0900-0.120 mm (0.00355-0.00472 in)
Piston Ring Groove Clearance (Oil Ring) .............. 0.040-0.080 mm (0.0016-0.0031 in)
Crankpin to Crankpin Bearing Oil Clearance .............. 0.020-0.051 mm (0.00079-0.0020 in)
Crankpin O.D 33.959-33.975 mm (1.3370-1.3375 in)
Crankpin Bearing I.D .............. 33.995-34.010 mm (1.3384-1.3389 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 Spring Tilt .............. 1.2 mm (0.047 in)
Valve Spring Free Length .............. 31.3-31.8 mm (1.24-1.25 in)
Valve Spring Setting Load / Setting Length .............. 65 N / 27.0 mm (15 lbf / 1.06 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)
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
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