Honda GD321

Honda GD321The Honda GD321 is a 317 cc (19.34 cu·in) natural aspirated single-cylinder four-stroke air-cooled small diesel engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

It has a 76.0 mm (2.99 in) cylinder bore and 70.0 mm (2.76 in) piston stroke. The compression ratio rating is 19.0:1.

This engine produced from 6.0 PS (4.4 KW; 5.9 HP) at 3,600 rpm to 7.1 PS (5.2 kW; 7.0 HP) at 3,600 rpm of horsepower and from 15.7 N·m (1.6 kg·m, 11.6 ft·lb) at 2,500 rpm to 30.4 Nm (3.1 kg·m; 22.44 ft·lb) at 1,250 rpm of torque.

The Honda GD321 features:

  • OHV design
  • Direct injection fuel system
  • Zexel PFRIKX fuel injection pump
  • Zexel DLLA-P injection nozzle
  • Mechanical centrifugal govervor
  • Forced spray lubrication system
  • Forced air cooling system
  • Recoil starter, starter motor

General information

Engine Specifications
Engine modelGD321
Engine type4-stroke, OHV, single-cylinder
Displacement317 cm3, (19.34 cu·in)
Max. horsepower Type S,Q,W,V,P: 7.1 PS (5.2 kW; 7.0 HP) at 3,600 rpm
Type B: 6.0 PS (4.4 KW; 5.9 HP) at 3,000 rpm
Type L: 6.8 PS (5.0 KW; 6.7 HP) at 1,800 rpm
Max. torque Type S,Q,W,V,P: 15.7 N·m (1.6 kg·m, 11.6 ft·lb) at 2,500 rpm
Type B: 15.7 N·m (1.6 kg·m, 11.6 ft·lb) at 1,800 rpm
Type L: 30.4 Nm (3.1 kg·m; 22.44 ft·lb) at 1,250 rpm
Cooling systemForced air
Air cleanerDual type and cyclone
Lubricating systemForced spray
Fuel systemDirect injection
Fuel tank capacity4.6 L (1.22 US. gal. 1.01 Imp. gal.)
Fuel usedDiesel fuel
Starting systemRecoil starter, starter motor
Stoping systemFuel cut with speed control lower (Stop lever)
GovernorMechanical centrifugal govervor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)420 x 405 x 470 mm (16.5 x 15.9 x 18.5 in)
Dry weight48.0 kg (105.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:19.0:1
Cylinder bore:76.0 mm (2.99 in)
Piston stroke:70.0 mm (2.76 in)
Cylinder internal diameter (standard):76.000-76.017 mm (2.9921-2.9928 in)
Piston skirt outer diameter (standard):75.940-75.960 mm (2.9898-2.9905 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (standard):41.000-41.024 mm (1.6142-1.6151 in)
Connecting rod small end diameter (standard):20.010-20.028 mm (0.7878-0.7885 in)
Side clearance (Top):0.065-0.095 mm (0.0026-0.0037 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):0.200-0.350 mm (0.0079-0.0138 in)
Ring end gap (Second):0.200-0.350 mm (0.0079-0.0138 in)
Ring end gap (Oil):0.200-0.400 mm (0.0079-0.0157 in)
Ring width (Top):1.975-1.990 mm (0.0778-0.0783 in)
Ring width (Second):1.975-1.990 mm (0.0778-0.0783 in)
Ring width (Oil):3.970-3.990 mm (0.1563-0.1571 in)
Crankshaft main journal diameter:46.970-46.994 mm (1.8492-1.8502 in)
Crankpin journal diameter:37.976-38.000 mm (1.4951-1.4961 in)
Crankshaft center distance:35 mm (1.38 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
Others
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 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:1.15 L (1.22 US. qt, 1.01 Imp. qt.)
Oil pressure:3.9-5.2 kg/cm2 (55.5-74.0 psi) at 3,600 rpm
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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