The Honda GD1250 is a 1.25 l (1,235 cc, 75.6 cu-in) three-cylinder water-cooled 4-stroke diesel engine, manufactured by Honda Motor Company for general-purpose applications.
An 82 mm (3.23 in) cylinder bore and 78 mm (3.07 in) piston stroke give the engine a total of 1,235 cc (75.6 cu-in) of displacement. Compression ratio rating is 18:1.
It produced up to 24 HP (16.4 kW) of maximum output (modification SH3). The maximum torque is 55.9 N·m (5.7 kg·m, 41.22 ft·lb) at 2,200 rpm.
General information
| Engine Specifications | |
| Model | GD1250 |
| Type | 4-stroke, OHV, three cylinder |
| Displacement | 1,235 cm 3 (75.6 cu-in) |
| Max. horsepower |
SH1: 20 HP (14.9 kW) at 2,600 rpm SH2: 22 HP (16.4 kW) at 3,000 rpm SH3: 24 HP (17.9 kW) at 3,600 rpm |
| Max. torque (crank PTO) |
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 |
| Firing order | 1-3-2 (1-2-3 from timing belt side) |
| Injection timing |
SH1, SH2: B.T.D.C 15° SH3: B.T.D.C 18° |
| Cooling system | Liquid-cooling |
| Lubricating system | Forced oil by trochoid pump |
| Starting system | Starter motor |
| Fuel used | Diesel fuel |
| Fuel tank capacity | 20.0 l (5.28 US. Gal, 4.40 Imp. Gal.) |
| Fuel consumption |
SH1: 180 g/psh (18 HP/2,600 prm) SH2: 194 g/psh (20 HP/3,000 prm) SH3: 214 g/psh (22 HP/3,600 prm) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| SH1 | SH2 | SH3 | |
| Length, mm (in) | 520 (20.5) | ||
| Width, mm (in) | 415 (16.3) | ||
| Height, mm (in) | 540 (21.3) | 555 (21.9) | |
| Dry weight, kg (lb) | 100.0 (220.5) | ||
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 18:1 | |
| Bore x Stroke | 82 mm X 78 mm (2.99 x 3.07 in) | |
| Sleeve internal diameter | 82.000-82.017 mm (3.2283-3.2290 in) | |
| Piston skirt outer diameter | 81.930-81.950 mm (3.225-3.226 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.085-0.115 mm (0.0033-0.0045 in) |
| Second | 0.055-0.085 mm (0.0022-0.0022 in) | |
| Oil | 0.020-0.055 mm (0.0008-0.0022 in) | |
| Ring end gap | Top | 0.20-0.40 mm (0.008-0.016 in) |
| Second | 0.20-0.40 mm (0.008-0.016 in) | |
| Oil | 0.20-0.40 mm (0.008-0.016 in) | |
| Piston pin outer diameter | 22.994-23.000 mm (0.9053-0.9055 in) | |
| Connecting rod small end ID | 23.010-23.028 mm (0.9060-0.9066 in) | |
| Cylinder Head | ||
| Distortion of cylinder head | 0.05 mm (0.002 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 6.575-6.590 mm (0.2589-0.2594 in) |
| EXHAUST | 6.545-6.560 mm (0.2577-0.2583 in) | |
| Guide internal diameter | INTAKE / EXHAUST | 6.600-6.615 mm (0.2598-0.2604 in) |
| Spring free length | 38.1 mm (1.33 in) | |
| Cam lobe height | INTAKE / EXHAUST | 39.538-39.938 mm (1.5566-1.5724 in) |
| Valve rocker arm internal diameter | 16.012-16.030 mm (0.6304-0.6311 in) | |
| Rocker arm shaft outer diameter | 15.976-16.994 mm (0.6290-0.6691 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 Information
| Engine | |
| Maximum speed |
SH1: 2,750 rpm SH2: 3,120 rpm SH3: 3,740 rpm |
| Idle speed | 800 rpm |
| Cylinder compression | 27.0 kg/cm2 (384 psi) at 200 rpm |
| Valve clearance | |
| Intake valve | 0.20 ± 0.02 (0.006 ± 0.00078) |
| Exhaust valve | 0.20 ± 0.02 (0.006 ± 0.00078) |
| Oil system | |
| Oil type | Diesel oil (API Service Classification 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 |
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