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 modelGD411
Engine type4-stroke, OHV, single-cylinder
Displacement411 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 systemForced air
Air cleanerDual type and cyclone
Lubricating systemForced spray
Fuel systemZexel PFRIKX fuel injection pump and Zexel DLLA-P injection nozzle
Fuel consumption180-190 g/HPh
Fuel tank capacity4.6 L (1.22 US. gal. 1.01 Imp. gal.)
Fuel usedDiesel fuel
Starting systemRecoil starter, starter motor
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (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 weight54.0 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 bolts43 Nm; 4.3 kg·m; 31 ft·lb
Cylinder head nuts11 Nm; 1.1 kg·m; 8 ft·lb
Rocker arm shaft nuts11 Nm; 1.1 kg·m; 8 ft·lb
Tappet adjusting nuts9 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 nuts32 Nm; 3.2 kg·m; 23 ft·lb
Relief valve33 Nm; 3.3 kg·m; 24 ft·lb
Drain plug bolt33 Nm; 3.3 kg·m; 24 ft·lb
Flywheel nut250 Nm; 25.0 kg·m; 180 ft·lb
Injection nozzle10 Nm; 1.0 kg·m; 7 ft·lb
Air breather joint nuts18 Nm; 1.8 kg·m; 13 ft·lb
Fuel injection pump bolts22 Nm; 2.2 kg·m; 16 ft·lb
Fuel joint bolts28 Nm; 2.8 kg·m; 20 ft·lb
Air breather bolt18 Nm; 1.8 kg·m; 13 ft·lb
Fuel pipe nuts20 Nm; 2.0 kg·m; 14 ft·lb
Muffler nuts, bolts22 Nm; 2.2 kg·m; 16 ft·lb
Fuel tank bolts11 Nm; 1.1 kg·m; 18 ft·lb
Fuel filter bolts11 Nm; 1.1 kg·m; 18 ft·lb
Drain bolt11 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
Resistance2.0 ±0.5 Ω
Starter motor
Brush length14.3-14.7 mm (0.56-0.58 in)
Mica depth0.4-0.8 mm (0.016-0.031 in)
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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