Kubota D1703-M-DI

Kubota D1703-M-DIThe Kubota D1703-M-DI is a 1.7 L (1,647 cc, 100.5 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.

An 87.0 mm (3.43 in) cylinder bore and an 92.4 mm (3.64 in) piston stroke give the D1703-M-DI engine a total of 1,647 cc of displacement. The compression ratio rating is 20.0:1.

The D1703-M-DI engine produced 35.5 PS (26.1 KW; 35.0 HP) at 2,800 rpm of the net (intermittent) horsepower and 37.3 PS (27.4 KW; 36.7 HP) at 2,800 rpm of gross (intermittent) horsepower.

The Kubota D1703-M-DI features:

  • Troiddal type combustion chamber (Direct Injection)
  • Bosch K-type mini fuel injection pump
  • Bosch P-type hole fuel injection nozzle
  • Centrifugal ball type, all speed mechanical governor
  • Forced lubrication by trochoid pump
  • Liquid cooling system forced circulation with water pump
  • Electric starter (12V, 1.4 kW)
  • Charing generator (12V, 480 W)

General information

Engine Specifications
Engine modelD1703-M-DI
Engine type4-stroke, vertical, three-cylinders
Displacement1.7 L, 1,647 cm3, (100.5 cu·in)
Max. horsepower Net (intermittent): 35.5 PS (26.1 KW; 35.0 HP) at 2,800 rpm
Gross (intermittent): 37.3 PS (27.4 KW; 36.7 HP) at 2,800 rpm
Max. torque
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberTroiddal type (Direct Injection)
Fuel injection pumpBosch “K”-type mini
Injection nozzleBosch “P”-type hole
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 1.4 kW)
Starting support deviceGlow plug in combustion chamber
GovernorCentrifugal mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)572 x 507 x 643 mm (22.5 x 20.0 x 25.3 in)
Dry weight148.0 kg (326.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:20.0:1
Cylinder bore:87.0 mm (3.43 in)
Piston stroke:92.4 mm (3.64 in)
Cylinder internal diameter (standard):87.000-87.022 mm (3.4252-3.4261 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 (Top):0.050-0.090 mm (0.0020-0.0035 in)
Side clearance (Second):0.050-0.090 mm (0.0020-0.0035 in)
Side clearance (Oil):0.030-0.070 mm (0.0012-0.0028 in)
Ring end gap (Top):0.200-0.350 mm (0.0080-0.0138 in)
Ring end gap (Second):0.350-0.500 mm (0.0138-0.0197 in)
Ring end gap (Oil):0.200-0.400 mm (0.0079-0.0157 in)
Number of main bearings:4
Crankshaft main journal diameter: S/n below 3R9999: 51.921-51.940 mm (2.0441-2.0449 in)
S/n above 3S0001: 59.921-59.940 mm (2.3590-2.3598 in)
Crankpin journal diameter:46.959-46.975 mm (1.8487-1.8494 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):33.900 mm (1.3346 in)
Camshaft cam height (EXHAUST):33.900 mm (1.3346 in)
Camshaft journal diameter :39.934-39.950 mm (1.5722-1.5728 in)

Tightening torque

Tightening torque specs
Rocker arm bracket screw:23.5-27.5 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft)
Cylinder head screw:93.1-98.0 Nm (9.5-10.0 kgf-m, 68.7-72.3 lb-ft)
Nozzle holder clamp screw:25.5-29.5 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft)
Connecting rod screw:44.1-49.0 Nm (4.5-5.0 kgf-m, 32.5-36.2 lb-ft)
Flywheel:98.1-107.9 Nm (10.0-11.0 kgf-m, 72.3-79.6 lb-ft)
Main bearing case screw 1:46.1-50.9 Nm (4.7-5.2 kgf-m, 34.0-37.6 lb-ft)
Main bearing case screw 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:30.0-33.0 kgf/cm2 (2.94-3.24 MPa, 427-469 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)
Engine oil pressure: Idle speed: 49 kPa (0.5 kgf/cm2, 7.0 psi)
Rated speed: 294.2-441 kPa (3.0-4.5 kgf/cm2, 42.7-64 psi)
Fuel system
Fuel injection pumpBosch “K”-type mini
Injection timing:9.0-11.0° B.T.D.C.
Fuel injection pressure 1st stage: 18.6 MPa (190 kgf/cm2, 2702 psi)
2st stage: 22.6 MPa (230 kgf/cm2, 3270 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)
Coolant capacity:5.5 liters (1.5 US gal, 1.2 Imp. gal)
Electrical system
Battery:12V, 60A (75D31R)
Alternator brush Length (std/min):10.5 mm (0.4130 in) / 8.4 mm (0.3310 in)
Starter brush Length (std/min):15.0 mm (0.5910 in) / 11.0 mm (0.4330 in)
Glow plug resistance:Approx 1.0 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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