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Kubota D662 Engine

General Technical Data

Kubota D662 Engine Specifications

Engine Model .......... Kubota D662
Engine Type .......... Vertical, water-cooled, 4-cycle diesel
Number of cylinders .......... 3
Bore, mm (in.) .......... 64.0 (2.52)
Stroke, mm (in.) .......... 68.0 (2.68)
Total displacement, cm3 (cu. in.) .......... 656 (40.1)
Gross power, kw (hp) .......... 14.3 (19.2)
Net power, kw (hp) .......... 12.9 (17.3)
Maximum speed, rpm .......... 3800
Idling speed, rpm .......... 900-1000
Combustion Chamber .......... Spherical type (E-TVCS)
Direction of rotation .......... Counter-clockwise
Compression ratio .......... 23:1
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

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

Dimensions

Length, mm (in.) .......... 435 (17.1)
Width, mm (in.) .......... 404 (15.9)
Height, mm (in.) .......... 564 (22.2)
Dry weight, kg (lbs.) .......... 63.7 (140)

Kubota D662 Maintenance Data

Fuel type .......... Diesel fuel No. 2-D
Engine oil type .......... SAE 10W-30/15W-40
Engine oil capacity, L (qts) .......... 3.2 (3.3)
Coolant capacity, L (qts) .......... 3.1 (3.2)
Oil filter change interval .......... Every 100 hours
Oil change interval .......... Every 100 hours
Fuel filter change interval .......... Every 200 hours

Kubota D662 Service Specifications

Cylinder Block

Cam Height (Intake and Exhaust) .......... 26.88 mm (1.058 in.)
Camshaft Alignment .......... 0.01 mm (0.0004 in.)
Camshaft Journal O.D. .......... 32.934-32.950 mm (1.2967-1.2972 in.)
Camshaft Journal to Cylinder Block Bore, Oil Clearance .......... 0.050-0.091 mm (0.0020-0.0035 in.)
Crankpin Bearing I.D. .......... 33.995-34.010 mm (1.3384-1.3389 in.)
Crankpin to Crankpin Bearing, Oil Clearance .......... 0.020-0.051 mm (0.00079-0.0020 in.)
Cylinder Block Bore I.D. .......... 33.000-33.025 mm (1.2993-1.3001 in.)
Cylinder Liner (Oversize 0.25 mm) I.D. .......... 64.250-64.269 mm (2.52953-2.53027 in.)
Cylinder Liner I.D. .......... 64.000-64.019 mm (2.51968-2.52043 in.)
Idle Gear Bushing I.D. .......... 20.000-20.051 mm (0.78740-0.78940 in.)
Idle Gear Shaft O.D. .......... 19.967-19.980 mm (0.78611-0.78661 in.)
Idle Gear Shaft to Idle Gear Bushing, Oil Clearance .......... 0.020-0.084 mm (0.00079-0.0033 in.)
Piston Pin Bore I.D. .......... 20.000-20.013 mm (0.78741-0.78791 in.)
Piston Pin O.D. .......... 20.002-20.011 mm (0.78748-0.78783 in.)
Piston Pin to Small End Bushing (Spare Parts), Oil Clearance .......... 0.015-0.075 mm (0.00059-0.0029 in.)
Piston Pin to Small End Bushing, Oil Clearance .......... 0.014-0.038 mm (0.00056-0.0014 in.)
Piston Ring to Piston Ring Groove, Clearance (Oil Ring) .......... 0.040-0.080 mm (0.0016-0.0031 in.)
Piston Ring to Piston Ring Groove, Clearance (Second Ring) .......... 0.0900-0.120 mm (0.00355-0.00472 in.)

Cylinder Head

Compression Pressure .......... 2.85-3.23 MPa (413-469 psi)
Cylinder Head Surface, Flatness .......... 0.05 mm (0.002 in.)
Exhaust Valve Timing, Close .......... 0.26 rad (15°) after T.D.C
Exhaust Valve Timing, Open .......... 0.87 rad (50°) before B.D.C
Intake Valve Timing, Close .......... 0.79 rad (45°) after B.D.C
Intake Valve Timing, Open .......... 0.35 rad (20°) before T.D.C
Push Rod Alignment .......... 0.25 mm (0.0098 in.)
Rocker Arm I.D. .......... 10.500-10.518 mm (0.41339-0.41409 in.)
Rocker Arm Shaft O.D. .......... 10.473-10.484 mm (0.41233-0.41275 in.)
Rocker Arm Shaft to Rocker Arm, Oil Clearance .......... 0.016-0.045 mm (0.00063-0.0017 in.)
Top Clearance .......... 0.50-0.70 mm (0.020-0.027 in.)
Valve Clearance (Cold) .......... 0.145-0.185 mm (0.00571-0.00728 in.)
Valve Guide I.D. .......... 6.010-6.025 mm (0.2367-0.2372 in.)
Valve Recessing (Intake and Exhaust) .......... 0.10-0.10 mm (0.0039-0.0039 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.)
Valve Spring (Intake and Exhaust), Tilt .......... 1.2 mm (0.047 in.)
Valve Stem O.D. .......... 5.968-5.980 mm (0.2350-0.2354 in.)
Valve Stem to Valve Guide (Intake and Exhaust), Clearance .......... 0.030-0.057 mm (0.0012-0.0022 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.)

Tightening Torque Specs

Alternator’s pulley nut, Nm (lb.-ft.) .......... 58.4-78.9 (43.1-58.2)
Bearing case cover mounting screw (M6 x 1), Nm (lb.-ft.) .......... 9.81-11.2 (7.24-8.31)
Connecting rod screw (M7 x 0.75), Nm (lb.-ft.) .......... 27-30 (20-22)
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)
Drain plug with copper gasket (M12 x 1.25), Nm (lb.-ft.) .......... 33-37 (24-27)
Dynamo’s pulley nut (M10 x 1.25), Nm (lb.-ft.) .......... 40-44 (29-32)
Flywheel screw (M10 x 1.25), Nm (lb.-ft.) .......... 54-58 (40-43)
Main bearing case screw 1 (M6 x 1), Nm (lb.-ft.) .......... 13-15 (9.4-11)
Main bearing case screw 2 (M7 x 1), Nm (lb.-ft.) .......... 27-30 (20-22)
Nozzle holder, Nm (lb.-ft.) .......... 35-39 (26-28)
Oil pressure switch (PT 1/8), Nm (lb.-ft.) .......... 15-19 (11-14)

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