Honda GD1250

Honda GD1250The 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

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