The Kubota D1703-M is a 1.7 L (1,647 cc, 100.5 cu·in) straight-three, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota.
The Kubota D1703-M-E engine has a spherical type сombustion сhamber (E-TVCS), the Bosch mini fuel injection pump. The cylinder bore and the piston stroke are 87.0 mm (3.43) in and 92.4 mm (3.64 in), respectively. The compression ratio rating is 22.6:1.
The D1703-M-Ediesel engine produced 35.0 PS (25.7 KW; 34.5 HP) at 2,800 rpm of net horsepower.
The breakdown of the engine code is as follows:
- D – 3-cylinders
- 17 – Approximate displacement 1700 cc
General information
Engine Specifications | |
Engine code | D1703-M-E |
Layout | Straight-3, vertical diesel engine |
Fuel type | Diesel fuel No.2-D |
Production | – |
Displacement | 1.7 L, 1,647 cm3 (100.5 cu in) |
Fuel injection pump | Bosch mini fuel injection pump |
Fuel nozzle | – |
Starting system | Electric starting with 12V (1.4 kW) starter |
Starting support device | Glow plug |
Governor | Centrifugal mechanical governor |
Power adder | None |
Max. Horsepower |
Net (intermittent): 35.0 PS (25.7 KW; 34.5 HP) at 2,800 rpm Net (continuous): 30.5 PS (22.4 KW; 30.0 HP) at 2,800 rpm |
Torque output | – |
Firing order | 1-2-3 |
Dimensions (L x W x H): | 572 x 507 x 643 mm (22.5 x 20.0 x 25.3 in) |
Weight | 148.0 kg (326.0 lbs) |
Cylinder block
Cylinder block | ||
Compression ratio: | 22.6:1 | |
Cylinder bore: | 87.0 mm (3.43 in) | |
Piston stroke: | 92.4 mm (3.64 in) | |
Number of piston rings (compression / oil): | 2 / 1 | |
Cylinder inner diameter: | 87.000-87.022 mm (3.26772-3.26858 in) | |
Piston skirt diameter | – | |
Piston ring side clearance: | Second | 0.093-0.128 mm (0.0037-0.0050 in) |
Oil | 0.020-0.060 mm (0.0008-0.0023 in) | |
Piston ring end gap: | Top | 0.200-0.400 mm (0.0080-0.0157 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: |
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) |
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Crankpin diameter: | 46.959-46.975 mm (1.8487-1.8494 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 | 33.900 mm (1.3346 in) |
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: | 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 screw: | 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 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) |
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 | 36.0-41.0 kgf/cm2 (3.53-4.02 MPa, 512-583 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 | 13.73-14.7 MPa (140-150 kgf/cm2, 1991-2133 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) |
Coolant capacity: | 5.5 liters (1.5 US gal, 1.2 Imp. gal) |
Electrical system | |
Battery: | 12V, 80 Ah |
Alternator current output: | 35A/14V at 4,000 rpm |
Alternator brush Length (std/min): | 10.5 mm (0.4130 in) / 8.4 mm (0.3310 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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