The 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 |
Production | – |
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 | – |
EXHAUST | – | |
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 |
We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.
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