Kubota D1403

Kubota D1403The Kubota D1403 is a 1.4 L (1,393 cc, 85.0 cu·in) straight-three, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota.

The Kubota D1403 engine has a spherical type сombustion сhamber, the Bosch mini fuel injection pump, and the Bosch throttle-type injection nozzle. The cylinder bore and the piston stroke are 80.0 mm (3.15) in and 92.4 mm (3.64 in), respectively. The compression ratio rating is 23.0:1.

The D1403-B(E) diesel engine produced 31.4 PS (23.1 KW; 31.0 HP) at 2,800 rpm of gross horsepower.

The breakdown of the engine code is as follows:

  • D – 3-cylinders
  • 14 – Approximate displacement 1400 cc

General information

Engine Specifications
Engine code D1403-B(E)
Layout Straight-3, vertical diesel engine
Fuel type Diesel fuel No.2-D
Displacement 1.4 L, 1,393 cm3 (85.0 cu in)
Fuel injection pump Bosch mini fuel injection pump
Fuel nozzle Bosch throttle-type
Starting system Electric starting with 12V (1.2 kW) starter
Starting support device Glow plug
Governor Centrifugal ball mechanical governor
Power adder None
Max. Horsepower Net (intermittent): 29.4 PS (21.6 KW; 29.0 HP) at 2,800 rpm
Gross (intermittent): 31.4 PS (23.1 KW; 31.0 HP) at 2,800 rpm
Torque output
Firing order 1-2-3
Dimensions (L x W x H): 568 x 512 x 639 mm (22.4 x 20.2 x 25.2 in)
Weight 148.0 kg (326.0 lbs)

Cylinder block

Cylinder block
Compression ratio: 23.0:1
Cylinder bore: 80.0 mm (3.15 in)
Piston stroke: 92.4 mm (3.64 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder inner diameter: 80.000-85.019 mm (3.1496-3.1504 in)
Piston skirt diameter
Piston ring side clearance: Second 0.093-0.120 mm (0.0037-0.0047 in)
Oil 0.020-0.052 mm (0.0008-0.0020 in)
Piston ring end gap: Top 0.300-0.450 mm (0.0118-0.0177 in)
Second 0.300-0.450 mm (0.0118-0.0177 in)
Oil 0.250-0.450 mm (0.0099-0.0177 in)
Piston pin outer diameter 23.002-23.011 mm (0.9056-0.9059 in)
Crankshaft main journal diameter: 51.921-51.940 mm (2.0441-2.0449 in)
Crankpin diameter: 43.959-43 975 mm (1.7307-1.7313 in)

Cylinder head

Cylinder head
Valve Arrangement: OHV, gear drive
Valves: 6 (2 valves per cylinder)
Valve timing: INTAKE
Valve seat width: INTAKE 2.120 mm (0.0835 in)
EXHAUST 2.120 mm (0.0835 in)
Valve stem diameter: INTAKE 7.960-7.975 mm (0.3134-0.3140 in)
EXHAUST 7.960-7.975 mm (0.3134-0.3140 in)
Valve spring free length: INTAKE 41.7-42.2 mm (1.6417-1.6614 in)
EXHAUST 41.7-42.2 mm (1.6417-1.6614 in)
Camshaft cam height: INTAKE 33.470 mm (1.3177 in)
EXHAUST 33.470 mm (1.3177 in)
Camshaft journal diameter: 39.934-39.950 mm (1.5722-1.5728 in)

Tightening torque

Tightening torque specs
Rocker arm bracket nuts: 22.5-27.5 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft)
Cylinder head: 93.1-98.0 Nm (9.5-10.0 kgf-m, 68.7-72.3 lb-ft)
Nozzle holder assembly: 49.0-68.6 Nm (5.0-7.0 kgf-m, 36.2-50.6 lb-ft)
Connecting rod bolts: Non-flange bolt:
36.3-41.2 Nm (3.7-4.2 kgf-m, 26.6-30.4 lb-ft)
Flange bolt1:
44.1-49.0 Nm (4.5-5.0 kgf-m, 32.5-36.2 lb-ft)
Flywheel bolts: 98.1-107.9 Nm (10.0-11.0 kgf-m, 72.3-79.6 lb-ft)
Main bearing case bolts 1: 46.1-50.9 Nm (4.7-5.2 kgf-m, 34.0-37.6 lb-ft)
Main bearing case bolts 2: 68.6-73.5 Nm (7.0-7.5 kgf-m, 50.6-54.2 lb-ft)

Maintenance data

Valve clearance
Intake valve 0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve 0.18-0.22 mm (0.0071-0.0087 in)
Compression pressure
Standard 36.0-38.0 kgf/cm2 (3.53-3.72 MPa, 512-540 psi)
Oil system
Recommended engine oil CD or CE
SAE Viscosity Number SAE 10W-30, 10W-40
Engine oil capacity Oil pan depth 90.0 mm (3.54 in): 5.6 L (1.5 US gal, 1.2 Imp. gal)
Oil pan depth 124.0 mm (4.88 in): 7.0 L (1.8 US gal, 1.5 Imp. gal)
Fuel system
Injection timing: 17-19° B.T.D.C.
Fuel injection pressure 13.73 MPa (140 kgf/cm2, 1991 psi)
Cooling system
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)
Electrical system
Battery: 12V, 70 or 80 Ah
Alternator current output: 35A/14V at 4,000 rpm
Alternator brush Length (std/min): 10.5 mm (0.4130 in) / 4.5 mm (0.1770 in)
Glow plug resistance: Approx 0.8 Ω
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