The Kubota D1503-DI is a 1.5 L (1,499 cc, 91.44 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.
An 83.0 mm (3.27 in) cylinder bore and an 92.4 mm (3.64 in) piston stroke give the D1503-DI engine a total of 1,499 cc of displacement. The compression ratio rating is 20.0:1.
The D1503-M-DI engine produced 32.0 PS (23.5 KW; 31.5 HP) at 2,800 rpm of the net (intermittent) horsepower and 33.7 PS (24.8 KW; 33.3 HP) at 2,800 rpm of gross (intermittent) horsepower.
The Kubota D1503-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, 360 W)
General information
| Engine Specifications | |
| Engine model | D1503-M-DI |
| Engine type | 4-stroke, vertical, three-cylinders |
| Displacement | 1.5 L, 1,499 cm3, (91.44 cu·in) |
| Max. horsepower | Net (intermittent): 32.0 PS (23.5 KW; 31.5 HP) at 2,800 rpm Gross (intermittent): 33.7 PS (24.8 KW; 33.3 HP) at 2,800 rpm |
| Max. torque | – |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication by pump |
| Combustion chamber | Troiddal type (Direct Injection) |
| Fuel injection pump | Bosch “K”-type mini |
| Injection nozzle | Bosch “P”-type hole |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 1.4 kW) |
| Starting support device | Glow plug in combustion chamber |
| Governor | Centrifugal mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 599 x 514 x 643 mm (23.6 x 20.2 x 25.3 in) |
| Dry weight | 148.0 kg (326.0 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 20.0:1 |
| Cylinder bore: | 83.0 mm (3.27 in) |
| Piston stroke: | 92.4 mm (3.64 in) |
| Cylinder internal diameter (standard): | 83.000-83.022 mm (3.2677-3.2686 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): | 0.093-0.128 mm (0.0037-0.0050 in) |
| Side clearance (Oil): | 0.020-0.060 mm (0.0008-0.0023 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0080-0.0138 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: | 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
| Engine | |
| 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 pump | Bosch “K”-type mini |
| Injection timing: | 10.5-12.5° 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 |
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