Honda GCV520

Honda GCV520The Honda GCV520 is a small (530 cc, 32.3 cu-in) 90° V-twin air-cooled 4-stroke internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company for general-purpose applications, such as: commercial lawn and garden equipment, tractors, construction and industrial equipment, agricultural equipment, small vehicles.

This engine has two cylinders, integrated cylinder, and head, overhead camshaft, two-barrel carburetor. The Honda GCV520 engine has transistorized magneto ignition, recoil or electric starter.

Cylinder bore and piston stroke are 77.0 mm (3.0 in) and 57.0 mm (2.2 in), respectively. Compression ratio rating is 8.0:1. The GCV520 produces 10.4 kW (14 HP) at 3,600 rpm and 35.9 N·m (3.66 kg·m, 26.5 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
Model GCV520 (vertical shaft)
Type 4-stroke, OHV, V-twin 90°
Displacement 530 cm 3 (32.3 cu-in)
Max. horsepower 14 HP (10.4 kW) at 3,600 rpm
Max. torque (crank PTO) 35.9 N·m (3.66 kg·m, 26.5 ft·lb) at 2,500 rpm
Carburetor Horizontal type, two barrels, butterfly valve
Cooling system Forced-air
Ignition system Transistorized magneto ignition
Lubricating system Splash
Starting system Recoil or electric starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
Fuel consumption 230 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

GCV520
Length, mm (in) 456 (18.0)
Width, mm (in) 427 (16.8)
Height, mm (in) 331 (13.0)
Dry weight, kg (lb) 30.5 (67.2)
Operating
weight, kg (lb)
31.5 (69.4)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.0:1
Bore x Stroke 77 mm X 57 mm (3.0 x 2.2 in)
Sleeve internal diameter 77.00 mm (3.031 in)
Piston skirt outer diameter 76.985 mm (3.1096 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top 0.050-0.080 mm (0.0020-0.0031 in)
Second 0.030-0.060 mm (0.0012-0.0024 in)
Ring end gap Top/Second 0.20-0.40 mm (0.008-0.016 in)
Ring width Top/second 1.990 mm (0.0783 in)
Connecting rod small end ID 18.005 mm (0.7089 in)
Connecting rod big end ID 35.025 mm (1.3789 in)
Crankpin outer diameter 34.985 mm (1.3774 in)
Main journal outer diameter PTO side 30.993 mm (1.2202 in)
Flywheel side 34.993 mm (1.3777 in)
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: OHV
Valves: 4 (2 per cylinder)
Stem outer diameter (standard): INTAKE 5.485 mm (0.2159 in)
EXHAUST 5.440 mm (0.214 in)
Guide internal diameter INTAKE / EXHAUST 5.5 mm (0.2165 in)
Spring free length 34.0 mm (1.34 in)
Cam height: 40.251 mm (1.5847 in)
Cam pulley shaft outer diameter: 9.987 mm (0.3932 in)
Rocker arm internal diameter: 6.000 mm (0.2362 in)
Rocker arm shaft outer diameter: 5.990 mm (0.2358 in)

Tightening torque specs

Tightening torque specs
Cylinder nut 32 Nm; 3.3 kg·m; 24 ft·lb
Connecting rod bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain bolt 44 Nm; 4.5 kg·m; 33 ft·lb
Oil filter holder 18 Nm; 1.8 kg·m; 13 ft·lb
Oil filter 12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut 7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Governor fork screw 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Flywheel bolt 157 Nm; 16.0 kg·m; 116 ft·lb
Ignition coil stud bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Fuel pump screw 3 Nm; 0.3 kg·m; 2.2 ft·lb
Breather valve bolt 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Oil pan bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Starter solenoid nut 12 Nm; 1.2 kg·m; 8.6 ft·lb
Starter solenoid terminal nut 9 Nm; 0.9 kg·m; 6.5 ft·lb
Through bolt 7 Nm; 0.7 kg·m; 5.1 ft·lb
Fuel drain screw 4 Nm; 0.4 kg·m; 2.9 ft·lb
Air vent cover screw 2 Nm; 0.2 kg·m; 1.4 ft·lb
Others
5 mm bolts, nuts 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts 10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts 24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts 37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts 55 Nm; 5.5 kg·m; 39.5 ft·lb

Service Information

Engine
Maximum speed 3,000 ± 150 rpm
Idle speed 1,400 ± 150 rpm
Cylinder compression 6.0-8.0 kg/cm2 (85-114 psi) at 600 rpm
Valve clearance
Intake valve 0.10 ± 0.04 (0.004 ± 0.002)
Exhaust valve 0.15 ± 0.04 (0.006 ± 0.002)
Oil system
Oil type Honda 4-stroke or an equivalent (SE or SF)
Recommended oil SAE 10W-30
Oil capacity 1.3 l (1.37 US. qt, 1.14 Imp. qt.)
Ignition system
Ignition timing 20° B.T.D.C.
Spark plug NGK: BPR5ES
DENSO: W16EPR-U
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance 1.0-1.2 kΩ
Secondary ignition coil N1 resistance 9.2-14.0 kΩ
Secondary ignition coil N2 resistance 9.8-14.8 kΩ
Ignition coil air gap 0.2-0.6 mm (0.008-0.024 in)
Carburetor
Main jet N.1 #76.2, N.2 #78.8
Pilot jet N.1,2 #35
Float height 18.5 mm (0.73 in)
Pilot screw opening N.1 1-3/8 turns out
N.2 1-9/16 turns out
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