Honda GD411

Honda GD411The Honda GD411 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 19.4:1 for the B-type engine, 20.0:1 for the North American engine version, and 18.2:1 for the others.

This engine produced 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm of horsepower for S,Q,V,P,E types, 7.5 PS (5.5 KW; 7.4 HP) at 3,000 rpm for B-type and 8.7 PS (6.4 KW; 8.6 HP) at 1,800 rpm for L-type engine.

The Honda GD411 features:

  • OHV design
  • Zexel PFRIKX fuel injection pump
  • Zexel DLLA-P injection nozzle
  • Centrifugal governor
  • Forced spray lubrication system
  • Forced air cooling system
  • Recoil starter, starter motor

General information

Engine Specifications
Engine model GD411
Engine type 4-stroke, OHV, single-cylinder
Displacement 411 cm3, (25.1 cu·in)
Max. horsepower S,Q,V,P,E: 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm
B: 7.5 PS (5.5 KW; 7.4 HP) at 3,000 rpm
L: 8.7 PS (6.4 KW; 8.6 HP) at 1,800 rpm
Max. torque S,Q,V,P,E: 20.6 N·m (2.1 kg·m, 15.19 ft·lb) at 2,500 rpm
B: 19.6 N·m (2.0 kg·m, 14.5 ft·lb) at 1,800 rpm
L: 40.2 N·m (4.1 kg·m, 30 ft·lb) at 1,250 rpm
Cooling system Forced air
Air cleaner Dual type and cyclone
Lubricating system Forced spray
Fuel system Zexel PFRIKX fuel injection pump and Zexel DLLA-P injection nozzle
Fuel consumption 180-190 g/HPh
Fuel tank capacity 4.6 L (1.22 US. gal. 1.01 Imp. gal.)
Fuel used Diesel fuel
Starting system Recoil starter, starter motor
Stoping system Ignition primary circuit ground
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 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, 19.4:1 or 20.0:1
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): 81.940-81.960 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
Generator
Resistance 2.0 ±0.5 Ω
Starter motor
Brush length 14.3-14.7 mm (0.56-0.58 in)
Mica depth 0.4-0.8 mm (0.016-0.031 in)

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