Honda GD321

Honda GD321The Honda GD321 is a (317 cc, 19.34 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 GD321 engine could be equipped with recoil starter and starter motor, or recoil starter only.

The GD321 has a 76.0 mm (2.99 in) cylinder bore and 70.0 mm (2.76 in) piston stroke. The compression ratio is 20:1 for North America type and 19:1 for other engines. It produced 7.0 HP (5.2 kW) of maximum output and 15.7 N·m (1.6 kg·m, 11.57 ft·lb) at 2,500 rpm of torque.

General information

Engine Specifications
Model GD321
Type 4-stroke, OHV, single cylinder
Displacement 317 cm 3 (19.34 cu-in)
Max. horsepower S,Q,W,V,P type: 7.0 HP (5.2 kW) at 3,600 rpm
B type: 6.0 HP (4.4 kW) at 3,000 rpm
L type: 6.8 HP (5.0 kW) at 1,800 rpm
Max. torque (crank PTO) S,Q,W,V,P type:15.7 N·m (1.6 kg·m, 11.57 ft·lb) at 2,500 rpm
B type: 15.7 N·m (1.6 kg·m, 11.57 ft·lb) at 1,800 rpm
L type: 30.4 N·m (3.1 kg·m, 23 ft·lb) at 1,250 rpm
Cooling system Forced-air
Lubricating system Forced spray
Starting system Recoil starter or starter motor
Stoping system Fuel cut with speed control lower (Stop lever)
Fuel used Diesel fuel
Fuel tank capacity 4.6 l (1.21 US. Gal, 1.2 Imp. Gal.)
Fuel consumption S,Q,W,V,P type: 180 g/HPh
B type: 196 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio: 19:1, 20:1
Bore x Stroke 76 mm X 70 mm (2.99 x 2.76 in)
Sleeve internal diameter 76.000-76.017 mm (2.9921-2.9928 in)
Piston skirt outer diameter 75.940-75.960 mm (2.9898-2.9905 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top 0.065-0.095 mm (0.0026-0.0037 in)
Second 0.055-0.085 mm (0.0022-0.0033 in)
Oil 0.020-0.055 mm (0.0008-0.0022 in)
Ring end gap Top 0.20-0.35 mm (0.008-0.014 in)
Second 0.20-0.35 mm (0.008-0.014 in)
Oil 0.20-0.40 mm (0.008-0.016 in)
Ring width Top 1.990-1.975 mm (0.0783-0.0778 in)
Second 1.990-1.975 mm (0.0783-0.0778 in)
Oil 3.990-3.970 mm (0.1571-0.01563 in)
Connecting rod small end ID 20.010-20.028 mm (0.7878-0.7885 in)
Connecting rod big end ID 41.000-41.024 mm (1.6142-1.6151 in)
Crankpin outer diameter 37.976-38.000 mm (1.4951-1.4961 in)
Main journal outer diameter 46.970-46.994 mm (1.8492-1.8502 in)
Cylinder Head
Distortion of cylinder head 0.05 mm (0.002 in)
Valve Arrangement: OHV
Valves: 2
Stem outer diameter (standard): INTAKE 6.590-6.575 mm (0.2594-0.2589 in)
EXHAUST 6.550-6.540 mm (0.2579-0.2575 in)
Guide internal diameter INTAKE / EXHAUST 6.600-6.615 mm (0.2598-0.2604 in)
Spring free length 33.7 mm (1.33 in)
Cam lobe height INTAKE / EXHAUST 41.022 mm (1.6150 in)
Valve rocker arm internal diameter INTAKE / EXHAUST 16.000-16.018 mm (0.6300-0.6306 in)
Rocker arm shaft outer diameter INTAKE / EXHAUST 15.984-15.966 mm (0.6293-0.6286 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
Others
5 mm bolts, nuts 5.0 Nm; 0.50 kg·m; 4.0 ft·lb
6 mm bolts, nuts 10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts 21 Nm; 2.1 kg·m; 15 ft·lb
10 mm bolts, nuts 35 Nm; 3.5 kg·m; 25 ft·lb
12 mm bolts, nuts 60 Nm; 6.0 kg·m; 44 ft·lb

Service Information

Engine
Maximum speed 3,750 ± 150 rpm
Idle speed 1,400 ± 150 rpm
Cylinder compression 26.0 kg/cm2 (370 psi) at 300 rpm
Valve clearance
Intake valve 0.15 ± 0.02 (0.006 ± 0.00078)
Exhaust valve 0.15 ± 0.02 (0.006 ± 0.00078)
Oil system
Oil type Diesel oil (API Service Classification CC or CD)
Recommended oil SAE 10W-30
Oil capacity 1.15 l (1.21 US. qt, 1.01 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 10 mm (0.39 in)
Mica depth 0.4-0.5 mm (0.016-0.020 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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.


*