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Kubota Z482 Engine

General Technical Data

Kubota Z482 Engine Specifications

Engine Model .......... Kubota Z482
Engine Type .......... Vertical, water-cooled, 4-stroke diesel
Number of cylinders .......... 2
Bore, mm (in.) .......... 67.0 (2.64)
Stroke, mm (in.) .......... 68.0 (2.68)
Total displacement, cm3 (cu. in.) .......... 479 (29.4)
Gross power, kw (hp) .......... 9.9 (13.3)
Net power, kw (hp) .......... 9.3 (12.5)
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

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, 28 AH
Charging Alternator .......... 12V, 150W

Dimensions

Length, mm (in.) .......... 351 (13.8)
Width, mm (in.) .......... 389 (15.3)
Height, mm (in.) .......... 520 (20.5)
Dry weight, kg (lbs.) .......... 53.1 (117)

Kubota Z482 Maintenance Data

Fuel type .......... Diesel fuel No. 2-D
Engine oil type .......... SAE 10W-30/15W-40
Engine oil capacity, L (qts) .......... 2.1 (2.2)
Coolant capacity, L (qts) .......... 2.8 (3.0)
Oil filter change interval .......... Every 200 hours
Oil change interval .......... Every 200 hours
Fuel filter change interval .......... Every 400 hours

Kubota Z482 Service Specifications

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.)
Valve Face (Intake and Exhaust), Angle .......... 0.79 rad (45°)
Valve Seat (Intake and Exhaust), Angle .......... 0.79 rad (45°)
Valve Seat (Intake and Exhaust), Width .......... 2.12 mm (0.0835 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
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.)

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 Side Clearance .......... 0.15-0.31 mm 0.0059-0.012 in.)
Piston Ring Gap, Top Ring .......... 0.15-0.30 mm (0.0059-0.011 in.)
Piston Ring Gap, Second Ring .......... 0.30-0.45 mm (0.012-0.017 in.)
Piston Ring Gap, Oil Ring .......... 0.15-0.30 mm (0.0059-0.011 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.)

Crankshaft

Crankshaft Journal to Crankshaft Bearing 1, Oil Clearance .......... 0.0340-0.106 mm (0.00134-0.00417 in.)
Crankshaft Journal O.D. .......... 39.934-39.950 mm (1.5722-1.5728 in.)
Crankshaft Bearing 1 I.D. .......... 39.984-40.040 mm (1.5742-1.5763 in.)
Crankshaft Journal to Crankshaft Bearing 2 (Flywheel Side), Clearance ......... 0.028-0.059 mm (0.001-0.0023 in)
Crankshaft Journal O.D. .......... 43.934-43.950 mm (1.7297-1.7303 in.)
Crankshaft Bearing 2 I.D. .......... 43.978-43.993 mm (1.7315-1.7320 in.)
Crankshaft Journal to Crankshaft Bearing 3 (Intermediate), Clearance ......... 0.028-0.059 mm (0.0011-0.0023 in)
Crankshaft Journal O.D. .......... 39.934-39.950 mm (1.5722-1.5728 in.)
Crankshaft Bearing 3 I.D. .......... 39.978-39.993 mm (1.5740-1.5745 in.)

Lubricating System

Engine Oil Pressure At Idle Speed .......... More than 49 kPa (7.1 psi)
Engine Oil Pressure At Rated Speed .......... 197-441 kPa (28.5-64.0 psi)
Inner Rotor to Outer Rotor, Clearance .......... 0.030-0.14 mm (0.0012-0.0055 in.)
Outer Rotor to Pump Body, Clearance .......... 0.070-0.15 mm (0.0028-0.0059 in.)
Inner Rotor to Cover, Clearance .......... 0.0750-0.135 mm (0.00296-0.00531 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)
Injection pipe retaining nut (M12 x 1.5), Nm (lb.-ft.) .......... 25-34 (18-25)
Overflow pipe retaining nut (M12 x 1.5), Nm (lb.-ft.) .......... 20-24 (15-18)
Nozzle holder assembly (M20 x 1.5), Nm (lb.-ft.) .......... 49-68 (37-50)
Glow plug (M8 x 1), Nm (lb.-ft.) .......... 7.9-14 (5.8-10)
Rocker arm bracket nut (M6 x 1), Nm (lb.-ft.) .......... 9.81-11.2 (7.24-8.31)

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