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Kubota D782 Engine

General Technical Data

Kubota D782 Engine Specifications

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

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

Dimensions

Length, mm (in.) .......... 427 (16.9)
Width, mm (in.) .......... 390 (15.4)
Height, mm (in.) .......... 521 (20.6)
Dry weight, kg (lbs.) .......... 63.5 (140)

Kubota D782 Maintenance Data

Fuel type .......... Diesel fuel No. 2-D
Engine oil type .......... SAE 10W-30/15W-40
Engine oil capacity, L (qts) .......... 3.6 (3.9)
Coolant capacity, L (qts) .......... 3.1 (3.3)
Oil filter change interval .......... Every 200 hours
Oil change interval .......... Every 200 hours
Fuel filter change interval .......... Every 400 hours

Kubota D782 Service Specifications

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 Block 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 (Spare Parts), 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 to Piston Ring Groove, Clearance (Second Ring) .......... 0.0900-0.120 mm (0.00355-0.00472 in.)
Piston Ring to 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

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 (Intake and Exhaust), Tilt .......... 1.2 mm (0.047 in.)
Valve Spring (Intake and Exhaust), Free Length .......... 31.3-31.8 mm (1.24-1.25 in.)
Valve Spring (Intake and Exhaust), Setting Load / Setting Length .......... 65 N / 27.0 mm (15 lbf / 1.06 in.)
Intake Valve Timing, Open .......... 0.35 rad (20°) before T.D.C
Intake Valve Timing, Close .......... 0.79 rad (45°) after B.D.C
Exhaust Valve Timing, Open .......... 0.87 rad (50°) before B.D.C
Exhaust Valve Timing, Close .......... 0.26 rad (15°) after T.D.C

Fuel System

Injection Pump, Injection Timing (3200 rpm) .......... 0.2793-0.3141 rad (16.00-18.00°) before T.D.C.
Injection Pump, Injection Timing (3200 rpm) .......... 0.2837-0.3097 rad (16.25-17.75°) before T.D.C.
Pump Element Fuel, Tightness .......... 13.73 MPa (1991 psi)
Injection Nozzle, Injection Pressure .......... 13.73-14.70 MPa (1992-2133 psi)

Electrical System (Starter)

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.)

Tightening Torque Specs

Cylinder head cover screw (M6 x 1), Nm (lb.-ft.) .......... 9.81-11.2 (7.24-8.31)
Cylinder head screw (M8 x 1.25), Nm (lb.-ft.) .......... 38-42 (28-31)
Flywheel screw (M10 x 1.25), Nm (lb.-ft.) .......... 54-58 (40-43)
Oil pressure switch (PT 1/8), Nm (lb.-ft.) .......... 15-19 (11-14)
Nozzle holder, Nm (lb.-ft.) .......... 35-39 (26-28)
Dynamo’s pulley nut (M10 x 1.25), Nm (lb.-ft.) .......... 40-44 (29-32)
Alternator’s pulley nut, Nm (lb.-ft.) .......... 58.4-78.9 (43.1-58.2)
Drain plug with copper gasket (M12 x 1.25), Nm (lb.-ft.) .......... 33-37 (24-27)

KUBOTA TRACTORS TROUBLESHOOTING
L235	L2501	L2550	L275	L3110
L3301	L35	L3710	L3901	L4310
L5030	M4700	M5700	M6040	M6800
M8200	M8540	M9000	MX5100	MX5200