Honda GD410

Honda GD410The Honda GD410 is a 411 cc (25.1 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small diesel engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

It has an 82.0 mm (3.23 in) cylinder bore and 78.0 mm (3.07 in) piston stroke. The compression ratio rating is 18.2:1.

The Honda GD410 engine produced 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm of maximum output power and 20.6 N·m (2.1 kg·m, 15.2 ft·lb) at 2,500 rpm of peak torque.

The Honda GD410 features:

  • OHV design
  • Centrifugal governor
  • Forced spray lubrication system
  • Forced air cooling system
  • Recoil starter or starter motor

General information

Engine Specifications
Engine model GD410
Engine type 4-stroke, OHV, single-cylinder
Displacement 411 cm3, (25.1 cu·in)
Max. horsepower 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm
Max. torque 20.6 N·m (2.1 kg·m, 15.2 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dual type and cyclone
Lubricating system Forced spray
Fuel tank capacity 4.6 L (1.22 US. gal. 1.01 Imp. gal.)
Fuel used Diesel fuel
Starting system Recoil starter, starter motor
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) – series “S” 440 x 405 x 490 mm (17.3 x 15.9 x 19.3 in)
Dry weight 54.0 kg (119 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 18.2:1
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): 81.940-81.960 mm (3.226-3.2268 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 46.000-46.024 mm (1.811-1.812 in)
Connecting rod small end diameter (standard): 23.010-23.028 mm (0.9059-0.9066 in)
Side clearance (Top): 0.085-0.115 mm (0.0033-0.0045 in)
Side clearance (Second): 0.075-0.110 mm (0.003-0.0043 in)
Side clearance (Oil): 0.020-0.055 mm (0.0008-0.0022 in)
Ring end gap (Top): 0.250-0.400 mm (0.0098-0.0157 in)
Ring end gap (Second): 0.250-0.400 mm (0.0098-0.0157 in)
Ring end gap (Oil): 0.200-0.400 mm (0.0079-0.0157 in)
Ring width (Top): 1.960-1.975 mm (0.0772-0.0778 in)
Ring width (Second): 1.950-1.970 mm (0.0768-0.0776 in)
Ring width (Oil): 3.970-3.990 mm (0.1563-0.1571 in)
Crankshaft main journal diameter: 49.970-49.994 mm (1.9673-1.9683 in)
Crankpin journal diameter: 42.976-43.000 mm (1.692-1.6929 in)
Crankshaft center distance: 39.000 mm (1.535 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 specs

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

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: 1.25 L (1.32 US. qt, 1.1 Imp. qt.)
Oil pressure: 3.9-5.2 kg/cm2 (55.5-74.0 psi) at 3,600 rpm

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