Kubota D1402

Kubota D1402The Kubota D1402 is a 1.4 L (1,395 cc, 85.1 cu·in) straight-three, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota.

The Kubota D1402 engine has a spherical type сombustion сhamber, Bosch K-type mini fuel injection pump, and the DN12 SD12 injection nozzle. The cylinder bore and the piston stroke are 85.0 mm (3.35 in) and 82.0 mm (3.23 in), respectively. The engine features a high-durability tunnel-type cylinder block with dry-type cylinder liners.

The D1402 diesel engine produced 32.5 PS (23.9 kW; 32.0 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 codeD1402-B
LayoutStraight-3, vertical diesel engine
Fuel typeDiesel fuel No.2-D
Displacement1.4 L, 1,395 cm3 (85.1 cu in)
Fuel injection pumpBosch K-type mini fuel injection pump
Fuel nozzleDN12 SD12
Starting systemElectric starting with 12V (1.4 kW) starter
Starting support deviceGlow plug
GovernorCentrifugal ball mechanical governor
Power adderNone
Max. Horsepower32.5 PS (23.9 kW; 32.0 HP) at 2,800 rpm
Torque output
Firing order1-2-3
Dimensions (L x W x H):568 x 512 x 639 mm (22.4 x 20.2 x 25.2 in)
Weight148.2 kg (326.7 lbs)

Cylinder block

Cylinder block
Compression ratio:21.0:1
Cylinder bore:85.0 mm (3.35 in)
Piston stroke:82.0 mm (3.23 in)
Number of piston rings (compression / oil):2 / 1
Cylinder inner diameter:85.000-85.022 mm (3.3465-3.3473 in)
Piston skirt diameter
Piston ring side clearance:Second0.093-0.120 mm (0.0037-0.0047 in)
Oil0.020-0.052 mm (0.0008-0.0020 in)
Piston ring end gap:Top0.300-0.450 mm (0.0118-0.0177 in)
Second0.300-0.450 mm (0.0118-0.0177 in)
Oil0.250-0.450 mm (0.0099-0.0177 in)
Piston pin outer diameter23.002-23.011 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:INTAKE2.10 mm (0.0827 in)
EXHAUST2.10 mm (0.0827 in)
Valve stem diameter:INTAKE7.960-7.975 mm (0.3134-0.3140 in)
EXHAUST7.960-7.975 mm (0.3134-0.3140 in)
Valve spring free length:INTAKE41.7-42.2 mm (1.6417-1.6614 in)
EXHAUST41.7-42.2 mm (1.6417-1.6614 in)
Camshaft cam height:INTAKE33.360-33.310 mm (1.3134-1.3114 in)
EXHAUST33.360-33.310 mm (1.3134-1.3114 in)
Camshaft journal diameter:39.934-39.950 mm (1.5722-1.5728 in)

Tightening torque

Tightening torque specs
Rocker сover cup nuts:6.9-8.8 Nm (0.7-0.9 kgf-m, 5.1-6.5 lb-ft)
Rocker arm bracket nuts:23.5-27.5 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft)
Cylinder head: Bolt and washer (s/n before 15906):
78.5-83.4 Nm (8.0-8.5 kgf-m, 57.8-61.5 lb-ft)
Flanged bolt (s/n after 15907):
93.2-98.1 Nm (9.5-10.0 kgf-m, 68.7-72.3 lb-ft)
Nozzle holder assembly:29.4-49.0 Nm (3.0-5.0 kgf-m, 21.7-36.2 lb-ft)
Connecting rod bolts: Non-flanged bolt:
36.3-41.2 Nm (3.7-4.2 kgf-m, 26.6-30.4 lb-ft)
Flanged bolt:
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 2: Bolt and washer (s/n before 43733):
63.7-68.6 Nm (6.0-7.0 kgf-m, 47.0-50.6 lb-ft)
Flanged bolt (s/n after 43734):
68.6-73.5 Nm (7.0-7.5 kgf-m, 50.6-54.2 lb-ft)
Main bearing case bolts 1: Bolt and washer (s/n before 43007):
29.4-34.3 Nm (3.0-3.5 kgf-m, 21.7-25.3 lb-ft)
Flanged bolt (s/n after 43008):
36.3-41.2 Nm (3.7-4.2 kgf-m, 26.8-30.4 lb-ft)

Maintenance data

Valve clearance
Intake valve0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve0.18-0.22 mm (0.0071-0.0087 in)
Compression pressure
Standard30.0-33.0 kgf/cm2 (2.9-3.2 MPa, 427-469 psi)
Oil system
Recommended engine oilCD or CE
SAE Viscosity NumberSAE 10W-30, 10W-40
Engine oil capacity6.2 L (6.55 US. qt, 5.46 Imp. qt.)
Fuel system
Injection timing:23-25° B.T.D.C.
Fuel injection pressure13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Thermostat’s valve opening temperature:80.5-83.5°C (176.9-182.3°F)
Temperature at which thermostat completely opens:95°C (203°F)
Electrical system
Battery:12V, 110Ah or equivalent
Alternator current output:25A/14V at 4,000 rpm
Alternator brush Length (std/min):15.5 mm (0.6102 in)/10.3 mm (0.4055 in)
Glow plug resistance:Approx 1.5 Ω
Starter motor (no-load test): Current: 90A or less
Voltage: 11.5V
Speed: 3,500 rpm or more
Commutator outer diameter (std/min):30.0 mm (1.1811 in) / 29.0 mm (1.1417 in)
Starter motor mica undercutting (std/min):0.5-0.9 mm (0.0197-0.0354 in) / 0.2 mm (0.0079 in)
Starter motor brush length (std/min):19.0 mm (0.7480 in) / 12.7 mm (0.5000 in)
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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