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
ModelGCV520 (vertical shaft)
Type4-stroke, OHV, V-twin 90°
Displacement530 cm 3 (32.3 cu-in)
Max. horsepower14 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
CarburetorHorizontal type, two barrels, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil or electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity
Fuel consumption230 g/HPh
PTO shaft rotationCounterclockwise (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 Stroke77 mm X 57 mm (3.0 x 2.2 in)
Sleeve internal diameter77.00 mm (3.031 in)
Piston skirt outer diameter76.985 mm (3.1096 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.050-0.080 mm (0.0020-0.0031 in)
Second0.030-0.060 mm (0.0012-0.0024 in)
Ring end gapTop/Second0.20-0.40 mm (0.008-0.016 in)
Ring widthTop/second1.990 mm (0.0783 in)
Connecting rod small end ID18.005 mm (0.7089 in)
Connecting rod big end ID35.025 mm (1.3789 in)
Crankpin outer diameter34.985 mm (1.3774 in)
Main journal outer diameterPTO side30.993 mm (1.2202 in)
Flywheel side34.993 mm (1.3777 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:4 (2 pre cylinder)
Stem outer diameter (standard):INTAKE5.485 mm (0.2159 in)
EXHAUST5.440 mm (0.214 in)
Guide internal diameterINTAKE / EXHAUST5.5 mm (0.2165 in)
Spring free length34.0 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 nut32 Nm; 3.3 kg·m; 24 ft·lb
Connecting rod bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain bolt44 Nm; 4.5 kg·m; 33 ft·lb
Oil filter holder18 Nm; 1.8 kg·m; 13 ft·lb
Oil filter12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Governor fork screw5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Flywheel bolt157 Nm; 16.0 kg·m; 116 ft·lb
Ignition coil stud bolt12 Nm; 1.2 kg·m; 8.6 ft·lb
Fuel pump screw3 Nm; 0.3 kg·m; 2.2 ft·lb
Breather valve bolt5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Oil pan bolt24 Nm; 2.4 kg·m; 17 ft·lb
Starter solenoid nut12 Nm; 1.2 kg·m; 8.6 ft·lb
Starter solenoid terminal nut9 Nm; 0.9 kg·m; 6.5 ft·lb
Through bolt7 Nm; 0.7 kg·m; 5.1 ft·lb
Fuel drain screw4 Nm; 0.4 kg·m; 2.9 ft·lb
Air vent cover screw2 Nm; 0.2 kg·m; 1.4 ft·lb
Others
5 mm bolts, nuts5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts55 Nm; 5.5 kg·m; 39.5 ft·lb

Service Information

Engine
Maximum speed3,000 ± 150 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression6.0-8.0 kg/cm2 (85-114 psi) at 600 rpm
Valve clearance
Intake valve0.10 ± 0.04 (0.004 ± 0.002)
Exhaust valve0.15 ± 0.04 (0.006 ± 0.002)
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity1.3 l (1.37 US. qt, 1.14 Imp. qt.)
Ignition system
Ignition timing20° B.T.D.C.
Spark plugNGK: BPR5ES
DENSO: W16EPR-U
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance1.0-1.2 kΩ
Secondary ignition coil N1 resistance9.2-14.0 kΩ
Secondary ignition coil N2 resistance9.8-14.8 kΩ
Ignition coil air gap0.2-0.6 mm (0.008-0.024 in)
Carburetor
Main jetN.1 #76.2, N.2 #78.8
Pilot jetN.1,2 #35
Float height18.5 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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