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 modelGD1250
Engine type4-stroke, OHV, three-cylinders
Displacement1,235 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 systemLiquid-cooled
Air cleanerDual type and cyclone
Lubricating systemForced oil by trochoid pump
Fuel systemDirect injection
Fuel consumption SH1: 180 g/psh
SH2: 194 g/psh
SH3: 214 g/psh
Fuel tank capacity20.0 L (5.28 US. gal. 4.4 Imp. gal.)
Fuel usedDiesel fuel
Starting systemStarter motor
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (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 weight100 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 bolts22 Nm; 2.2 kg·m; 16 ft·lb
Head cover nuts10 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 bolt38 Nm; 3.8 kg·m; 27 ft·lb
Timing belt adjuster bolt43 Nm; 4.3 kg·m; 31 ft·lb
Crankshaft bearing cap bolts68 Nm; 6.8 kg·m; 49 ft·lb
Connecting rod cap nuts32 Nm; 3.2 kg·m; 23 ft·lb
Rear end plate bolts55 Nm; 5.5 kg·m; 40 ft·lb
Flywheel bolts115 Nm; 11.5 kg·m; 83 ft·lb
Flywheel housing55 Nm; 5.5 kg·m; 40 ft·lb
Oil filter holder55 Nm; 5.5 kg·m; 40 ft·lb
Oil filter cartridge22 Nm; 2.2 kg·m; 16 ft·lb
Fuel pipe nuts22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Fuel joint bolts22.5 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 shaft43 Nm; 4.3 kg·m; 31 ft·lb
Glow plugs17.5 Nm; 1.75 kg·m; 12.7 ft·lb
Glow plug nuts1.25 Nm; 0.125 kg·m; 0.9 ft·lb
Injection pump nut and bolts22 Nm; 2.2 kg·m; 16 ft·lb
Oil pressure switch20 Nm; 2.0 kg·m; 14 ft·lb
Drain plug bolt45 Nm; 4.5 kg·m; 32 ft·lb
Thermostat switch22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Crankshaft pulley115 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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Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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