The Kubota D1302 is a 1.3 L (1,299 cc, 79.3 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.
An 82.0 mm (3.23 in) cylinder bore and an 82.0 mm (3.23 in) piston stroke give the D1302 engine a total of 1,299 cc of displacement. The compression ratio rating is 21.0:1.
The D1102 engine produced 27.3 PS (20.1 kW; 27.0 HP) at 2,800 rpm of the net (intermittent) horsepower and 30.5 PS (22.4 kW; 30.0 HP) at 2,800 rpm of gross (intermittent) horsepower.
The Kubota D1302 features:
- Spherical type combustion chamber
- Bosch K-type mini fuel injection pump
- DN12 SD12 injection nozzle
- Centrifugal ball mechanical governor
- Forced lubrication by pump
- Liquid cooling system forced circulation with water pump
- Electric starter (12V, 1.0 kW)
- Charging alternator (12V, 300 W)
General information
| Engine Specifications | |
| Engine model | D1302-B |
| Engine type | 4-stroke, vertical, three-cylinders |
| Displacement | 1.3 L, 1,229 cm3, (79.3 cu·in) |
| Max. horsepower | Net (intermittent): 27.3 PS (20.1 kW; 27.0 HP) at 2,800 rpm Gross (intermittent): 30.5 PS (22.4 kW; 30.0 HP) at 2,800 rpm |
| Max. torque | – |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication by pump |
| Combustion chamber | Spherical type |
| Fuel injection pump | Bosch K-type mini pump |
| Injection nozzle | DN12 SD12 |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 1.0 kW) |
| Starting support device | Glow plug |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 580 x 512 x 639 mm (22.8 x 20.2 x 25.2 in) |
| Dry weight | 147 kg (324.1 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 21.0:1 |
| Cylinder bore: | 82.0 mm (3.23 in) |
| Piston stroke: | 82.0 mm (3.23 in) |
| Cylinder internal diameter (standard): | 82.000-82.022 mm (3.2283-3.2292 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 23.025-23.040 mm (0.9065-0.9071 in) |
| Piston pin diameter: | 23.002-23.011 mm (0.9056-0.9059 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): | 2.100 mm (0.0827 in) |
| Valve seat width (EXHAUST): | 2.100 mm (0.0827 in) |
| Value seat angle (INTAKE): | 45° |
| Value seat 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) |
| Rocker arm shaft outer diameter: | 13.973-13.984 mm (0.5501-0.5506 in) |
| Camshaft cam height (INTAKE): | 33.360-33.310 mm (1.3134-1.3114 in) |
| Camshaft cam height (EXHAUST): | 33.360-33.310 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 22541): 78.5-83.4 Nm (8.0-8.5 kgf-m, 57.8-61.5 lb-ft) Flanged bolt (s/n after 22542): 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 33413): 63.7-68.6 Nm (6.0-7.0 kgf-m, 47.0-50.6 lb-ft) Flanged bolt (s/n after 33414): 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 33385): 29.4-34.3 Nm (3.0-3.5 kgf-m, 21.7-25.3 lb-ft) Flanged bolt (s/n after 33386): 36.3-41.2 Nm (3.7-4.2 kgf-m, 26.8-30.4 lb-ft) |
Service Data
| Engine | |
| Maximum speed: | 3,000 rpm |
| Idle speed: | 800 rpm |
| Cylinder compression: | 30.0-33.0 kgf/cm2 (2.9-3.2 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 pump |
| Oil type: | API CD or CE |
| Oil capacity: | 6.1 L (6.45 US. qt, 5.37 Imp. qt.) |
| Oil filter: | Full flow |
| Fuel system | |
| Fuel injection pump | Bosch K-type mini pump |
| Injection nozzle | DN12 SD12 |
| Injection timing: | 23-25° B.T.D.C. |
| Fuel injection pressure | 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi) |
| Cooling system | |
| Type: | Pressurized radiator (not included in the basic engine), forced circulation with water pump |
| Thermostat’s valve opening temperature: | 80.5-83.5°C (157.1-162.5°F) |
| Temperature at which thermostat completely opens: | 95°C (203°F) |
| Electrical system | |
| Battery: | 12V, 80Ah 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) |
| Starter motor (no-load test): | Current: 45A or less Voltage: 11V Speed: 6,000 rpm or more |
| Commutator outer diameter (std/min): | 32.7 mm (1.2874 in) / 32.5 mm (1.2795 in) |
| Starter motor mica undercutting (std/min): | 0.5-0.8 mm (0.0197-0.0315 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) |
| Glow plug resistance: | Approx 1.5 Ω |
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