The Kubota D782-E3 is a 778 cc (47.5 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.
A 67.0 mm (2.64 in) cylinder bore and 73.6 mm (2.9 in) piston stroke give the D782-E3 engine a total of 778 cc of displacement. The compression ratio rating is 24.0:1.
The D782-E3 engine produced 18.4 PS (13.5 kW; 18.1 HP) at 3,200 rpm of net (intermittent) horsepower and 15.9 PS (11.7 KW; 15.7 HP) at 3,200 rpm of net (continuous) horsepower.
The Kubota D782-E3 features:
- Spherical type combustion chamber
- 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, 1.0 kW)
General information
Engine Specifications | |
Engine model | D782-E3 |
Engine type | 4-stroke, vertical, three-cylinders |
Displacement | 778 cm3, (47.5 cu·in) |
Max. horsepower | Net (intermittent): 18.4 PS (13.5 kW; 18.1 HP) at 3,200 rpm Net (continuous): 15.9 PS (11.7 KW; 15.7 HP) at 3,200 rpm |
Max. torque | – |
Emission type | EPA/CARB Tier 4 level |
Cooling system | Liquid-cooled |
Lubricating system | Forced lubrication by pump |
Combustion chamber | Spherical type (E-TVCS) |
Fuel injection pump | Bosch MD type mini pump |
Injection type | Indirect injection |
Injection nozzle | Bosch throttle type |
Fuel used | Diesel fuel No.2-D |
Starting system | Electric starter (12V, 1.0 kW) |
Starting support device | Glow plug in combustion chamber |
Governor | Centrifugal ball mechanical governor |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions (L x W X H) | 426 x 398 x 519 mm (16.8 x 15.7 x 20.4 in) |
Dry weight | 63.5 kg (139.7 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 24.0:1 |
Cylinder bore: | 67.0 mm (2.64 in) |
Piston stroke: | 73.6 mm (2.9 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) |
Side clearance (Second): | 0.090-0.120 mm (0.0035-0.0047 in) |
Side 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: | 4 |
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,(6 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): | 31.6 mm (1.2441 in) |
Valve spring free length (EXHAUST): | 31.6 mm (1.2441 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) |
Camshaft lobe height (INTAKE): | 26.880 mm (1.0583 in) |
Camshaft lobe 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 | |
Head cover cap nuts (M6x1.0): | 3.9-5.3 Nm (0.4-0.6 kgf-m, 2.9-4.3 lb-ft) |
Head bolts (M8x1.25): | 39.2-44.1 Nm (4.0-4.5 kgf-m, 28.9-32.5 lb-ft) |
Main bearing case bolts 1 (M6x1.0): | 12.7-15.7 Nm (1.3-1.6 kgf-m, 9.4-11.6 lb-ft) |
Main bearing case screw 2 (M7x1.0): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
Flywheel bolts (M10x1.25): | 53.9-58.8 Nm (5.5-6.0 kgf-m, 39.8-43.4 lb-ft) |
Connecting rod bolts (M7x0.75): | 26.5-30.4 Nm (2.7-3.1 kgf-m, 19.5-22.4 lb-ft) |
Rocker arm bracket nuts (M6x1.0): | 9.81-11.28 Nm (1.0-1.15 kgf-m, 7.23-8.32 lb-ft) |
Idle gear shaft bolts (M6x1.0): | 9.8-11.3 Nm (1.00-1.15 kgf-m, 7.2-8.3 lb-ft) |
Idle gear shaft screws (M6x1.0): | 9.8-11.3 Nm (1.00-1.15 kgf-m, 7.2-8.3 lb-ft) |
Glow plugs (M8x1.0): | 7.8-14.7 Nm (0.8-1.5 kgf-m, 5.8-10.8 lb-ft) |
Nozzle holder assembly (M20x1.5): | 49.0-68.6 Nm (5.0-7.0 kgf-m, 36.2-50.6 lb-ft) |
Nozzle holder and nozzle retaining nut: | 58.8-78.5 Nm (6.0-8.0 kgf-m, 43.4-57.9 lb-ft) |
Injection pipe retaining nuts: | 24.5-34.3 Nm (2.5-3.5 kgf-m, 18.1-25.3 lb-ft) |
Service Data
Engine | |
Maximum speed: | 3800 rpm |
Idle speed: | 900-1000 rpm |
Cylinder compression: | 29.0-33.0 kgf/cm2 (2.84-3.24 MPa, 412-469 psi) |
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 CD or CE |
Oil capacity: | 3.6 liters (3.8 US.qts, 3.17 Imp. qts) |
Oil filter: | Full flow paper filter (cartridge type) |
Oil pressure: | At idle speed: 98 kPa (1.0 kgf/cm2, 14 psi) At rated speed: 196-441 kPa (2.0-4.5 kgf/cm2, 29-64 psi) |
Fuel system | |
Fuel injection pump | Bosch MD-type mini pump |
Injection nozzle | Bosch throttle type |
Injection timing: | 20° B.T.D.C. |
Fuel injection pressure | 13.73-14.71 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 | 3.1 liters (3.3 US.qts, 2.7 Imp. qts) |
Electrical system | |
Battery: | 12V, 36AH or equivalent |
Starter mica undercut: | 0.5-0.8 mm (0.0197-0.0315 in) |
Starter brush length: | 16.0 mm (0.6299 in) |
Alternator (no-load voltage): | AC 20V at 5,200 rpm |
Glow plug resistance: | Approx 0.9 Ω |
Alternator stator resistance: | Less than 1.0 Ω |
Alternator rotor resistance: | Less than 2.9 Ω |
Alternator slip ring: | 14.4 mm (0.567 in) |
Alternator brush Length: | 10.5 mm (0.413 in) |
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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