The Honda GD1250 is a 1.2 L (1,235 cc, 75.4 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion small diesel engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
An 82.0 mm (3.23 in) cylinder bore and 78.0 mm (3.07 in) piston stroke give the GD1250 engine a total of 1,235 cc of displacement. The compression ratio rating is 18.0:1.
This engine produced from 20.3 PS (14.9 kW; 20.0 HP) at 2,600 rpm to 24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm of horsepower.
The Honda GD1250 features:
- OHV design
- Direct injection
- Centrifugal governor
- Forced lubrication system
- Liquid-cooled cooling system
- Starter motor
General information
| Engine Specifications | |
| Engine model | GD1250 |
| Engine type | 4-stroke, OHV, three-cylinders |
| Displacement | 1,235 cm3, (75.4 cu·in) |
| Max. horsepower | SH1: 20.3 PS (14.9 kW; 20.0 HP) at 2,600 rpm SH2: 22.3 PS (16.4 KW; 22.0 HP) at 3,000 rpm SH3: 24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm |
| Max. torque | SH1: 64.7 N·m (6.6 kg·m, 47.73 ft·lb) at 2,600 rpm SH2: 61.8 N·m (6.3 kg·m, 45.56 ft·lb) at 2,000 rpm SH3: 55.9 N·m (5.7 kg·m, 41.22 ft·lb) at 2,200 rpm |
| Cooling system | Liquid-cooled |
| Air cleaner | Dual type and cyclone |
| Lubricating system | Forced oil by trochoid pump |
| Fuel system | Direct injection |
| Fuel consumption | SH1: 180 g/psh SH2: 194 g/psh SH3: 214 g/psh |
| Fuel tank capacity | 20.0 L (5.28 US. gal. 4.4 Imp. gal.) |
| Fuel used | Diesel fuel |
| Starting system | Starter motor |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 520 x 415 x 540 mm (20.5 x 16.3 x 21.3 in) |
| Dry weight | 100 kg (220.5 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 18.0:1 |
| Cylinder bore: | 82.0 mm (3.23 in) |
| Piston stroke: | 78.0 mm (3.07 in) |
| Cylinder internal diameter (standard): | 82.000-82.017 mm (3.2283-3.229 in) |
| Piston skirt outer diameter (standard): | 81.930-81.950 mm (3.2256-3.2264 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 23.010-23.028 mm (0.9059-0.9066 in) |
| Piston pin diameter: | 22.994-23.000 mm (0.9053-0.9055 in) |
| Side clearance (Top): | 0.082-0.115 mm (0.0032-0.0045 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): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring end gap (Oil): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Crankshaft center distance: | 39 mm (1.535 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2, (6 valves in total) |
| Valve steam diameter (INTAKE): | 6.575-6.590 mm (0.2589-0.2594 in) |
| Valve steam diameter (EXHAUST): | 6.545-6.560 mm (0.2577-0.2583 in) |
| Valve spring free length (INTAKE): | 38.1 mm (1.5 in) |
| Valve spring free length (EXHAUST): | 38.1 mm (1.5 in) |
| Camshaft lobe height (INTAKE): | 39.538-39.938 mm (1.5566-1.5724 in) |
| Camshaft lobe height (EXHAUST): | 39.538-39.938 mm (1.5566-1.5724 in) |
Tightening torque specs
| Tightening torque specs | |
| Camshaft holder bolts | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Head cover nuts | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Cylinder head bolts (M12) | Step 1: 45 Nm; 4.5 kg·m; 32 ft·lb Step 2: Turn all bolts 90° Step 3: Turn all bolts 90° once more |
| Cylinder head bolts (M8) | 30 Nm; 3.0 kg·m; 22 ft·lb |
| Timing belt driven pulley bolt | 38 Nm; 3.8 kg·m; 27 ft·lb |
| Timing belt adjuster bolt | 43 Nm; 4.3 kg·m; 31 ft·lb |
| Crankshaft bearing cap bolts | 68 Nm; 6.8 kg·m; 49 ft·lb |
| Connecting rod cap nuts | 32 Nm; 3.2 kg·m; 23 ft·lb |
| Rear end plate bolts | 55 Nm; 5.5 kg·m; 40 ft·lb |
| Flywheel bolts | 115 Nm; 11.5 kg·m; 83 ft·lb |
| Flywheel housing | 55 Nm; 5.5 kg·m; 40 ft·lb |
| Oil filter holder | 55 Nm; 5.5 kg·m; 40 ft·lb |
| Oil filter cartridge | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Fuel pipe nuts | 22.5 Nm; 2.25 kg·m; 16.3 ft·lb |
| Fuel joint bolts | 22.5 Nm; 2.25 kg·m; 16.3 ft·lb |
| Injection nozzle nuts | Step 1: 5 Nm; 0.5 kg·m; 3.6 ft·lb Step 2:10 Nm; 1.0 kg·m; 7 ft·lb |
| Governor shaft | 43 Nm; 4.3 kg·m; 31 ft·lb |
| Glow plugs | 17.5 Nm; 1.75 kg·m; 12.7 ft·lb |
| Glow plug nuts | 1.25 Nm; 0.125 kg·m; 0.9 ft·lb |
| Injection pump nut and bolts | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Oil pressure switch | 20 Nm; 2.0 kg·m; 14 ft·lb |
| Drain plug bolt | 45 Nm; 4.5 kg·m; 32 ft·lb |
| Thermostat switch | 22.5 Nm; 2.25 kg·m; 16.3 ft·lb |
| Crankshaft pulley | 115 Nm; 11.5 kg·m; 83 ft·lb |
Service Data
| Idle speed: | 800 rpm |
| Maximum speed: | SH1: 2,750 rpm SH2: 3,120 rpm SH3: 3,740 rpm |
| Cylinder compression: | 27.0 kg/cm2 (384 psi) at 200 rpm |
| 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 spray |
| Oil type: | Diesel oil (API CC or CD) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | SH1: 2.9 l (3.07 US. qt, 2.55 Imp. qt.) SH2, SH3: 4.8 l (5.07 US. qt, 4.22 Imp. qt.) |
| Oil pressure: | 4.0 kg/cm2 (57 psi) at 800 rpm |
| Fuel system | |
| Type: | Direct injection |
| Injection timing: | SH1, SH2: B.T.D.C 15° SH3: B.T.D.C 18° |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| Honda | H6522 |
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