The Kubota D1302 is a 1.3 L (1,299 cc, 79.3 cu·in) straight-three, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota.
The Kubota D1302 engine has a spherical type сombustion сhamber, Bosch K-type mini fuel injection pump, and the DN12 SD12 injection nozzle. The cylinder bore and the piston stroke are 82.0 mm (3.23 in) and 82.0 mm (3.23 in), respectively. The engine features a high-durability tunnel-type cylinder block with dry-type cylinder liners.
The D1302 diesel engine produced 30.5 PS (22.4 kW; 30.0 HP) at 2,800 rpm of gross horsepower.
The breakdown of the engine code is as follows:
- D – 3-cylinders
- 13 – Approximate displacement 1300 cc
General information
| Engine Specifications | |
| Engine code | D1302-B |
| Layout | Straight-3, vertical diesel engine |
| Fuel type | Diesel fuel No.2-D |
| Production | – |
| Displacement | 1.3 L, 1,299 cm3 (79.3 cu in) |
| Fuel injection pump | Bosch K-type mini fuel injection pump |
| Fuel nozzle | DN12 SD12 |
| Starting system | Electric starting with 12V (1.0 kW) starter |
| Starting support device | Glow plug |
| Governor | Centrifugal ball mechanical governor |
| Power adder | None |
| Max. Horsepower | 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): | 580 x 512 x 639 mm (22.8 x 20.2 x 25.2 in) |
| Weight | 147 kg (324.1 lbs) |
Cylinder block
| Cylinder block | ||
| Compression ratio: | 21.0:1 | |
| Cylinder bore: | 82.0 mm (3.23 in) | |
| Piston stroke: | 82.0 mm (3.23 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder inner diameter: | 82.000-82.022 mm (3.2283-3.2292 in) | |
| Piston skirt diameter | – | |
| Piston ring side clearance: | Second | 0.093-0.120 mm (0.0037-0.0047 in) |
| Oil | 0.020-0.052 mm (0.0008-0.0020 in) | |
| Piston ring end gap: | Top | 0.300-0.450 mm (0.0118-0.0177 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: | 51.921-51.940 mm (2.0441-2.0449 in) | |
| Crankpin diameter: | 43.959-43 975 mm (1.7307-1.7313 in) | |
Cylinder head
| Cylinder head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 6 (2 valves per cylinder) | |
| Valve timing: | INTAKE | – |
| EXHAUST | – | |
| Valve seat width: | INTAKE | 2.10 mm (0.0827 in) |
| EXHAUST | 2.10 mm (0.0827 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 | 33.360-33.310 mm (1.3134-1.3114 in) |
| 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) |
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 | 30.0-33.0 kgf/cm2 (2.9-3.2 MPa, 427-469 psi) |
| Oil system | |
| Recommended engine oil | CD or CE |
| SAE Viscosity Number | SAE 10W-30, 10W-40 |
| Engine oil capacity | 6.1 L (6.45 US.qts, 5.37 Imp. qts) |
| Fuel system | |
| 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 | |
| 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) |
| Glow plug resistance: | Approx 1.5 Ω |
| 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) |
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