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
ModelGD321
Type4-stroke, OHV, single cylinder
Displacement317 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
strong>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 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 consumption S,Q,W,V,P type: 180 g/HPh
B type: 196 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:19:1, 20:1
Bore x Stroke76 mm X 70 mm (2.99 x 2.76 in)
Sleeve internal diameter76.000-76.017 mm (2.9921-2.9928 in)
Piston skirt outer diameter75.940-75.960 mm (2.9898-2.9905 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.065-0.095 mm (0.0026-0.0037 in)
Second0.055-0.085 mm (0.0022-0.0033 in)
Oil0.020-0.055 mm (0.0008-0.0022 in)
Ring end gapTop0.20-0.35 mm (0.008-0.014 in)
Second0.20-0.35 mm (0.008-0.014 in)
Oil0.20-0.40 mm (0.008-0.016 in)
Ring widthTop1.990-1.975 mm (0.0783-0.0778 in)
Second1.990-1.975 mm (0.0783-0.0778 in)
Oil3.990-3.970 mm (0.1571-0.01563 in)
Connecting rod small end ID20.010-20.028 mm (0.7878-0.7885 in)
Connecting rod big end ID41.000-41.024 mm (1.6142-1.6151 in)
Crankpin outer diameter37.976-38.000 mm (1.4951-1.4961 in)
Main journal outer diameter46.970-46.994 mm (1.8492-1.8502 in)
Cylinder Head
Distortion of cylinder head0.05 mm (0.002 in)
Valve Arrangement:OHV
Valves:2
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
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 Information

Engine
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 capacity1.15 l (1.21 US. qt, 1.01 Imp. qt.)
Oil pressure3.9-5.2 kg/cm2 (55.5-74.0 psi) at 3,600 rpm
Generator
Resistance2.0 ±0.5 Ω
Starter motor
Brush length10 mm (0.39 in)
Mica depth0.4-0.5 mm (0.016-0.020 in)
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.


*