Kubota Z482-E

Kubota Z482-EThe Kubota Z482-E is a 479 cc (29.2 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine from the Super-mini series, manufactured by Kubota for generators.

It has an 67.0 mm (2.64 in) cylinder bore and 68.0 mm (2.68 in) piston stroke. The compression ratio rating is 23.5:1.

The Z482-E engine produced 12.6 PS (9.3 KW; 12.5 HP) at 3,600 rpm of the net (intermittent) horsepower, 11.0 PS (8.1 KW; 10.9 HP) at 3,600 rpm of net (continuous) horsepower and 9.2 PS (6.8 KW; 9.1 HP) at 3,000 rpm of generator spec (continuous) output power.

The Kubota Z482-E features:

  • Spherical type combustion chamber (E-TVCS)
  • Bosch MD-type mini fuel injection pump
  • Bosch throttle type injection nozzle
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump
  • Liquid cooling system
  • Electric starter (12V, 0.8 kW)
  • Generator for charging (12V, 150 W)

General information

Engine Specifications
Engine modelZ482-E
Engine type4-stroke, vertical, two-cylinders
Displacement479 cm3, (29.2 cu·in)
Max. horsepower Net (intermittent): 12.6 PS (9.3 KW; 12.5 HP) at 3,600 rpm
Net (cont.): 11.0 PS (8.1 KW; 10.9 HP) at 3,600 rpm
Generator spec (cont.): 9.2 PS (6.8 KW; 9.1 HP) at 3,000 rpm
Emission typeEPA/CARB Tier 2 level
Max. torque
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberSpherical type (E-TVCS)
Fuel injection pumpBosch MD type mini pump
Injection typeIndirect injection
Injection nozzleBosch throttle type
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 0.8 kW)
Starting support deviceGlow plug in combustion chamber
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)351x389x520 mm (13.8×15.3×20.5 in)
Dry weight53.1 kg (117.1 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:23.5:1
Cylinder bore:67.0 mm (2.64 in)
Piston stroke:68.0 mm (2.68 in)
Cylinder internal diameter (standard):67.000-67.019 mm (2.6378-2.6385 in)
Number of piston rings (compression / oil):2/1
Connecting rod small end diameter (standard):20.025-20.040 mm (0.7884-0.789 in)
Piston pin diameter:20.002-20.040 mm (0.7875-0.789 in)
Groove clearance (Second):0.090-0.120 mm (0.0035-0.0047 in)
Groove clearance (Oil):0.040-0.080 mm (0.0016-0.0031 in)
Ring end gap (Top):0.150-0.300 mm (0.0059-0.0118 in)
Ring end gap (Second):0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil):0.150-0.300 mm (0.0059-0.0118 in)
Number of main bearings:3
Crankshaft main journal diameter: Flywheel side: 43.934-43.950 mm (1.72969-1.73032 in)
Other: 39.934-39.950 mm (1.5722-1.5728 in)
Crankpin journal diameter:33.959-33.975 mm (1.337-1.3376 in)
Cylinder head
Valves:2,(4 valves in total)
Valve timing (INTAKE):
Valve timing (EXHAUST):
Valve seat width (INTAKE):2.120 mm (0.0835 in)
Valve seat width (EXHAUST):2.120 mm (0.0835 in)
Value seat angle (INTAKE):45°
Value seat angle (EXHAUST):45°
Valveface angle (INTAKE):45°
Valveface angle (EXHAUST):45°
Valve steam diameter (INTAKE):5.968-5.980 mm (0.2349-0.2354 in)
Valve steam diameter (EXHAUST):5.968-5.980 mm (0.2349-0.2354 in)
Valve spring free length (INTAKE):31.300-31.800 mm (1.232-1.252 in)
Valve spring free length (EXHAUST):31.300-31.800 mm (1.232-1.252 in)
Tappet outer diameter:17.966-17.984 mm (0.7073-0.7080 in)
Rocker arm shaft outer diameter:10.473-10.484 mm (0.4123-0.4127 in)
Rocker arm shaft hole inner diameter:10.500 to 10.518 mm (0.4134-0.4141 in)
Camshaft cam height (INTAKE):26.880 mm (1.0583 in)
Camshaft cam height (EXHAUST):26.880 mm (1.0583 in)
Camshaft journal diameter :32.934-32.950 mm (1.2966-1.2972 in)

Tightening torque

Tightening torque specs
Cylinder head cover screw (M6x1.0):6.86-11.3 Nm (0.7-1.15 kgf-m, 5.1-8.3 ft-lbs)
Injection pipe retaining nut (M12x1.5):24.5-34.3 Nm (2.5-3.5 kgf-m, 18.1-25.3 ft-lbs)
Overflow pipe retaining nut (M12x1.5):19.6-24.5 Nm (2.0-2.5 kgf-m, 14.5-18.1 ft-lbs)
Nozzle holder assembly (M20x1.5):49.0-68.6 Nm (5.0-7.0 kgf-m, 36.2-50.6 ft-lbs)
Glow plugs (M8x1.0):7.8-14.7 Nm (0.8-1.5 kgf-m, 5.8-10.8 ft-lbs)
Rocker arm bracket nuts (M6x1.0):9.81-11.28 Nm (1.0-1.15 kgf-m, 7.23-8.32 ft-lbs)
Cylinder head screw (M8x1.25):37.3-42.2 Nm (3.8-4.3 kgf-m, 27.5-31.1 ft-lbs)
Fan drive pulley screw (M12x1.5):117.7-127.5 Nm (12.0-13.0 kgf-m, 86.8-94.0 ft-lbs)
Idle gear shaft mounting screw (M6x1.0):9.8-11.3 Nm (1.00-1.15 kgf-m, 7.2-8.3 ft-lbs)
Oil pump mounting screw (M8 x 1.25):17.7-21.6 Nm (1.80-2.20 kgf-m, 13.0-15.9 ft-lbs)
Connecting rod screw (M7x0.75):26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 ft-lbs)
Flywheel screw (M10x1.25):53.9-58.8 Nm (5.5-6.0 kgf-m, 39.8-43.4 ft-lbs)
Main bearing case screw 1 (M6x1.0):12.7-15.7 Nm (1.3-1.6 kgf-m, 9.4-11.6 ft-lbs)
Main bearing case screw 2 (M7x1.0):26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 ft-lbs)
Nozzle holder:34.3-39.2 Nm (3.5-4.0 kgf-m, 25.3-28.9 ft-lbs)

Service Data

Engine speed
Maximum speed:3,800 rpm
Idle speed:900-1000 rpm
Cylinder compression
Standard:29.0-33.0 kgf/cm2 (2.84-3.24 MPa, 412-469 psi)
Minimum:23.0 kgf/cm2
Compression differential limit between cylinders:10% or less
Valve clearance
Intake valve clearance:0.145-0.185 mm (0.0057-0.0073 in)
Exhaust valve clearance:0.145-0.185 mm (0.0057-0.0073 in)
Oil system
Lubrication system:Forced lubrication by pump
Oil type:API CF, CD or CE
Oil capacity: Oil pan depth 101 mm (3.98 in): 2.1 L (2.2 US. qt, 1.85 Imp. qt.)
Oil pan depth 121 mm (4.76 in): 2.5 L (2.6 US. qt, 2.21 Imp. qt.)
Oil filter:Full flow paper filter (cartridge type)
Oil pressure: At idle spped: More than 49 kPa (0.5 kgf/cm2, 7 psi)
At rated speed: 196-441 kPa (2.0-4.5 kgf/cm2, 29-64 psi)
Fuel system
Fuel injection pumpBosch MD-type mini pump
Injection nozzleBosch throttle type
Injection timing:19-21° B.T.D.C.
Injection nozzle pressure13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type:Pressurized radiator, forced circulation with water pump (not included in the basic engine)
Thermostat’s valve opening temperature:69.5-72.5°C (157.1-162.5°F)
Temperature at which thermostat completely opens:85°C (185°F)
Coolant capacity:2.8 liters (3.0 US.qts, 2.5 Imp. qts)
Electrical system
Battery:12V, 28AH or equivalent
Starter brush length:16.0 mm (0.6299 in)
Glow plug resistance:Approx 0.9 Ω
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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