Honda GD411

Honda GD411The Honda GD411 is a (411 cc, 25.2 cu-in) single-cylinder air-cooled 4-stroke internal combustion diesel engine with horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

This engine has a single-cylinder; overhead valves and direct injection combustion system. The motor used Zexel PFRIKX fuel injection pump and Zexel DLLA-P injection nozzle. The GD411 engine could be equipped with recoil starter and starter motor, or recoil starter only.

The GD411 has an 82.0 mm (3.23 in) cylinder bore and 78.0 mm (3.07 in) piston stroke. The compression ratio is 19.4:1 for B type engine, 20:1 for North America type and 18.2:1 for other engines. It produced 6.6 kW (9.0 HP) of maximum output and 20.6 N·m (2.1 kg·m, 15.19 ft·lb) at 2,500 rpm of torque.

General information

Engine Specifications
Type4-stroke, OHV, single cylinder
Displacement411 cm 3 (25.2 cu-in)
Max. horsepower S,Q,V,P,E type: 9.0 HP (6.6 kW) at 3,600 rpm
B type: 7.5 HP (5.5 kW) at 3,000 rpm
L type: 8.7 HP (6.4 kW) at 1,800 rpm
Max. torque (crank PTO) S,Q,V,P,E type: 20.6 N·m (2.1 kg·m, 15.19 ft·lb) at 2,500 rpm
B type: 19.6 N·m (2.0 kg·m, 14.5 ft·lb) at 1,800 rpm
L type: 40.2 N·m (4.1 kg·m, 30 ft·lb) at 1,250 rpm
Cooling systemForced-air
Lubricating systemForced spray
Starting systemRecoil starter or starter motor
Stoping systemFuel cut with speed control lower (Stop lever)
Fuel usedDiesel fuel
Fuel tank capacity4.6 l (1.21 US. Gal, 1.2 Imp. Gal.)
Fuel consumption180-190 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:18.2:1, 19.4:1, 20:1
Bore x Stroke82 mm X 78 mm (3.23 x 3.07 in)
Sleeve internal diameter82.000-82.017 mm (3.2283-3.2290 in)
Piston skirt outer diameter81.940-81.960 mm (2.2260-2.2268 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.085-0.115 mm (0.0033-0.0045 in)
Second0.075-0.110 mm (0.0030-0.0043 in)
Oil0.020-0.055 mm (0.0008-0.0022 in)
Ring end gapTop0.25-0.40 mm (0.010-0.016 in)
Second0.25-0.40 mm (0.010-0.016 in)
Oil0.20-0.40 mm (0.008-0.016 in)
Ring widthTop1.970-1.965 mm (0.0776-0.0774 in)
Second1.970-1.950 mm (0.0776-0.0768 in)
Oil3.990-3.970 mm (0.1571-0.01563 in)
Connecting rod small end ID23.010-23.028 mm (0.9060-0.9066 in)
Connecting rod big end ID46.000-46.024 mm (1.8110-1.8120 in)
Crankpin outer diameter42.976-43.000 mm (1.920-1.6929 in)
Main journal outer diameter49.970-49.994 mm (1.9673-1.9683 in)
Cylinder Head
Distortion of cylinder head0.05 mm (0.002 in)
Valve Arrangement:OHV
Stem outer diameter (standard):INTAKE6.590-6.575 mm (0.2594-0.2589 in)
EXHAUST6.550-6.540 mm (0.2579-0.2575 in)
Guide internal diameterINTAKE / EXHAUST6.600-6.615 mm (0.2598-0.2604 in)
Spring free length33.7 mm (1.33 in)
Cam lobe heightINTAKE / EXHAUST41.022 mm (1.6150 in)
Valve rocker arm internal diameterINTAKE / EXHAUST16.000-16.018 mm (0.6300-0.6306 in)
Rocker arm shaft outer diameterINTAKE / EXHAUST15.984-15.966 mm (0.6293-0.6286 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
5 mm bolts, nuts5.0 Nm; 0.50 kg·m; 4.0 ft·lb
6 mm bolts, nuts10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts21 Nm; 2.1 kg·m; 15 ft·lb
10 mm bolts, nuts35 Nm; 3.5 kg·m; 25 ft·lb
12 mm bolts, nuts60 Nm; 6.0 kg·m; 44 ft·lb

Service Information

Maximum speed3,750 ± 150 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression26.0 kg/cm2 (370 psi) at 300 rpm
Valve clearance
Intake valve0.15 ± 0.02 (0.006 ± 0.00078)
Exhaust valve0.15 ± 0.02 (0.006 ± 0.00078)
Oil system
Oil typeDiesel oil (API Service Classification CC or CD)
Recommended oilSAE 10W-30
Oil capacity1.25 l (1.32 US. qt, 1.10 Imp. qt.)
Oil pressure3.9-5.2 kg/cm2 (55.5-74.0 psi) at 3,600 rpm
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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  1. chasing a set (of 4) engine mounts for a Generator, Compressor,Welder, that has this engine. Can you supply?
    Details are:Honda 9.0 (Diesel) GD410 – 411cm3
    x163093745 E000026
    2-Stage DI
    5kVA Generator

  2. Hello I have 4 410/411 engines two turn over but won’t fire,but they do fire on easy start
    The diesel is getting to the injector so I can only think it’s injector
    Any ideas or do you know anyone that might know more
    Thank you

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