Kubota D1403

Kubota D1403The Kubota D1403 is a 1.4 L (1,393 cc, 85.0 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.

An 80.0 mm (3.15 in) cylinder bore and an 92.4 mm (3.64 in) piston stroke give the D1403 engine a total of 1,393 cc of displacement. The compression ratio rating is 23.0:1.

The D1403-B(E) engine produced 29.4 PS (21.6 KW; 29.0 HP) at 2,800 rpm of the net (intermittent) horsepower and 31.4 PS (23.1 KW; 31.0 HP) at 2,800 rpm of gross (intermittent) horsepower.

The Kubota D1403 features:

  • Spherical type combustion chamber (N-TVCS of E-TVCS, after Jan 1994, s/n 12212 and above)
  • Bosch mini type fuel injection pump (PFR 3M)
  • Bosch throttle-type injection nozzle
  • Centrifugal ball mechanical governor
  • Forced lubrication by trochoid pump
  • Liquid cooling system forced circulation with water pump
  • Electric starter (12V, 1.2 kW)
  • Dynamo for charing (12V, 360 W)

General information

Engine Specifications
Engine modelD1403-B(E)
Engine type4-stroke, vertical, three-cylinders
Displacement1.4 L, 1,393 cm3, (85.0 cu·in)
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
Max. torque
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberSpherical type
Fuel injection pumpBosch mini type (PFR 3M)
Injection nozzleBosch throttle-type
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 1.2 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)568 x 512 x 639 mm (22.4 x 20.2 x 25.2 in)
Dry weight148.0 kg (326.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:23.0:1
Cylinder bore:80.0 mm (3.15 in)
Piston stroke:92.4 mm (3.64 in)
Cylinder internal diameter (standard):80.000-85.019 mm (3.1496-3.1504 in)
Number of piston rings (compression / oil):2/1
Connecting rod small end diameter (standard):25.025-25.040 mm (0.9852-0.9858 in)
Piston pin diameter:25.002-25.011 mm (0.9843-0.9847 in)
Side clearance (Second):0.093-0.120 mm (0.0037-0.0047 in)
Side clearance (Oil):0.020-0.052 mm (0.0008-0.0020 in)
Ring end gap (Top):0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Second):0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil):0.250-0.450 mm (0.0099-0.0177 in)
Number of main bearings:4
Crankshaft main journal diameter:51.921-51.940 mm (2.0441-2.0449 in)
Crankpin journal diameter:43.959-43 975 mm (1.7307-1.7313 in)
Cylinder head
Valves:2 (6 valves in total)
Valve seat width (INTAKE):2.120 mm (0.0835 in)
Valve seat width (EXHAUST):2.120 mm (0.0835 in)
Value seat angle (INTAKE):60°
Value seat angle (EXHAUST):45°
Value face angle (INTAKE):60°
Value face angle (EXHAUST):45°
Valve steam diameter (INTAKE):7.960-7.975 mm (0.3134-0.3140 in)
Valve steam diameter (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)
Valve spring free length (EXHAUST):41.7-42.2 mm (1.6417-1.6614 in)
Camshaft cam height (INTAKE):33.470 mm (1.3177 in)
Camshaft cam height (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)

Service Data

Maximum speed:3,000 rpm
Idle speed:700-750 rpm
Cylinder compression:36.0-38.0 kgf/cm2 (3.53-3.72 MPa, 512-540 psi)
Compression differential limit between cylinders:10% or less
Valve clearance
Intake valve clearance:0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve clearance:0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Lubrication system:Forced lubrication by trochoid pump
Oil type:API CD or better
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)
Oil filter:Full flow paper filter (cartrige type)
Fuel system
Fuel injection pumpBosch K-type mini pump
Injection nozzleDN12 SD12
Injection timing:18° B.T.D.C.
Fuel injection pressure13.73 MPa (140 kgf/cm2, 1991 psi)
Cooling system
Type:Pressurized radiator (not included in the basic engine), forced circulation with water pump
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, 70-80 Ah or equivalent
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
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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