The Honda GD320 is a 317 cc (19.34 cu·in) natural aspirated single-cylinder four-stroke air-cooled small diesel engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
It has a 76.0 mm (2.99 in) cylinder bore and 70.0 mm (2.76 in) piston stroke. The compression ratio rating is 19.0:1.
This engine produced 7.1 PS (5.2 kW; 7.0 HP) at 3,600 rpm of horsepower and 15.7 N·m (1.6 kg·m, 11.6 ft·lb) at 2,500 rpm of torque.
The Honda GD320 features:
- OHV design
- Mechanical centrifugal govervor
- Forced spray lubrication system
- Forced air cooling system
- Recoil starter, starter motor
General information
| Engine Specifications | |
| Engine model | GD320 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 317 cm3, (19.34 cu·in) |
| Max. horsepower | 7.1 PS (5.2 kW; 7.0 HP) at 3,600 rpm |
| Max. torque | 15.7 N·m (1.6 kg·m, 11.6 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual type and cyclone |
| Lubricating system | Forced spray |
| Fuel consumption | 180 g/PSh |
| Fuel tank capacity | 4.6 L (1.22 US. gal. 1.01 Imp. gal.) |
| Fuel used | Diesel fuel |
| Starting system | Recoil starter, starter motor |
| Stoping system | Fuel cut with speed control lower (Stop lever) |
| Governor | Centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 420 x 405 x 470 mm (16.5 x 15.9 x 18.5 in) |
| Dry weight | 48.0 kg (105.8 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 19.0:1 |
| Cylinder bore: | 76.0 mm (2.99 in) |
| Piston stroke: | 70.0 mm (2.76 in) |
| Cylinder internal diameter (standard): | 76.000-76.017 mm (2.9921-2.9928 in) |
| Piston skirt outer diameter (standard): | 75.940-75.960 mm (2.9898-2.9905 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 41.000-41.024 mm (1.6142-1.6151 in) |
| Connecting rod small end diameter (standard): | 20.010-20.028 mm (0.7878-0.7885 in) |
| Side clearance (Top): | 0.065-0.095 mm (0.0026-0.0037 in) |
| Side clearance (Second): | 0.055-0.085 mm (0.0022-0.0033 in) |
| Side clearance (Oil): | 0.020-0.055 mm (0.0008-0.0022 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Second): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Oil): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring width (Top): | 1.975-1.990 mm (0.0778-0.0783 in) |
| Ring width (Second): | 1.975-1.990 mm (0.0778-0.0783 in) |
| Ring width (Oil): | 3.970-3.990 mm (0.1563-0.1571 in) |
| Crankshaft main journal diameter: | 46.970-46.994 mm (1.8492-1.8502 in) |
| Crankpin journal diameter: | 37.976-38.000 mm (1.4951-1.4961 in) |
| Crankshaft center distance: | 35 mm (1.38 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 6.575-6.590 mm (0.2589-0.2594 in) |
| Valve steam diameter (EXHAUST): | 6.540-6.550 mm (0.2575-0.2579 in) |
| Valve spring free length (INTAKE): | 33.7 mm (1.3268 in) |
| Valve spring free length (EXHAUST): | 33.7 mm (1.3268 in) |
| Camshaft lobe height (INTAKE): | 41.022 mm (1.615 in) |
| Camshaft lobe height (EXHAUST): | 41.022 mm (1.615 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head bolts | 43 Nm; 4.3 kg·m; 31 ft·lb |
| Cylinder head nuts | 11 Nm; 1.1 kg·m; 8 ft·lb |
| Rocker arm shaft nuts | 11 Nm; 1.1 kg·m; 8 ft·lb |
| Tappet adjusting nuts | 9 Nm; 0.9 kg·m; 6.5 ft·lb |
| Oil pan bolt bolts |
M11: 71 Nm; 7.1 kg·m; 51 ft·lb M8: 22 Nm; 2.2 kg·m; 16 ft·lb |
| Connecting rod cap nuts | 32 Nm; 3.2 kg·m; 23 ft·lb |
| Relief valve | 33 Nm; 3.3 kg·m; 24 ft·lb |
| Drain plug bolt | 33 Nm; 3.3 kg·m; 24 ft·lb |
| Flywheel nut | 250 Nm; 25.0 kg·m; 180 ft·lb |
| Injection nozzle | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Air breather joint nuts | 18 Nm; 1.8 kg·m; 13 ft·lb |
| Fuel injection pump bolts | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Fuel joint bolts | 28 Nm; 2.8 kg·m; 20 ft·lb |
| Air breather bolt | 18 Nm; 1.8 kg·m; 13 ft·lb |
| Fuel pipe nuts | 20 Nm; 2.0 kg·m; 14 ft·lb |
| Muffler nuts, bolts | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Fuel tank bolts | 11 Nm; 1.1 kg·m; 18 ft·lb |
| Fuel filter bolts | 11 Nm; 1.1 kg·m; 18 ft·lb |
| Drain bolt | 11 Nm; 1.1 kg·m; 18 ft·lb |
| Others | |
| 5 mm bolts, nuts | 5.0 Nm; 0.50 kg·m; 4.0 ft·lb |
| 6 mm bolts, nuts | 10 Nm; 1.0 kg·m; 7 ft·lb |
| 8 mm bolts, nuts | 21 Nm; 2.1 kg·m; 15 ft·lb |
| 10 mm bolts, nuts | 35 Nm; 3.5 kg·m; 25 ft·lb |
| 12 mm bolts, nuts | 60 Nm; 6.0 kg·m; 44 ft·lb |
Service Data
| Engine | |
| Maximum speed: | 3,700±150 rpm |
| Idle speed: | 1,450±150 rpm |
| Cylinder compression: | 26.0 kg/cm2 (370 psi) at 300 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.13-0.17 mm (0.0051-0.0067 in) |
| Exhaust valve clearance: | 0.13-0.17 mm (0.0051-0.0067 in) |
| Oil system | |
| Lubrication system: | Forced spray |
| Oil type: | Diesel oil (API CC or CD) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.15 L (1.22 US. qt, 1.01 Imp. qt.) |
| Oil pressure: | 3.9-5.2 kg/cm2 (55.5-74.0 psi) at 3,600 rpm |
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