The Briggs and Stratton 303447 Vanguard is a 495 cc, (30.2 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion gasoline engine with a horizontal shaft, for general-purpose applications.
Cylinder bore and piston stroke are 68.0 mm (2.68 in) and 66.0 mm (2.6 in), respectively. The compression ratio rating is 8.2:1. This engine produced 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm of horsepower.
The B&S 303447 features:
- OHV design
- Magneto electronic ignition system
- Float type, down-draft carburetor
- Centrifugal governor
- Full pressure lubrication system with spin-on oil filter
- Forced air cooling system /li>
- Electric starter
General information
Engine Specifications | |
Engine model | 303447 Vanguard |
Engine type | 4-stroke, OHV, V-twin |
Displacement | 495 cm3, (30.2 cu·in) |
Max. horsepower | 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm |
Max. torque | – |
Cooling system | Forced air |
Air cleaner | Low profile dual-clean |
Lubricating system | Full pressure lubrication with spin-on oil filter |
Ignition system | Magneto electronic |
Fuel system | Float type, down-draft carburetor |
Fuel used | Gasoline |
Starting system | Electric starter |
Governor | Centrifugal governor |
Charging system | Alternator 12V, 16A |
Dimensions (L x W X H) | 279 x 410 x 438 mm (11 x 16.1 x 17.2 in) |
Dry weight | 32.7 kg (72.1 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 8.2:1 |
Cylinder bore: | 68.0 mm (2.68 in) |
Piston stroke: | 66.0 mm (2.6 in) |
Cylinder internal diameter (standard): | 68.000-68.030 mm (2.6772-2.6783 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod big end diameter (standard): | 37.060-37.080 mm (1.4591-1.4598 in) |
Connecting rod small end diameter (standard): | 17.090-17.100 mm (0.6728-0.6732 in) |
Piston pin diameter: | 17.070-17.080 mm (0.672-0.6724 in) |
Side clearance (Top): | 0.045-0.076 mm (0.0018-0.003 in) |
Side clearance (Second): | 0.045-0.076 mm (0.0018-0.003 in) |
Side clearance (Oil): | 0.110-0.150 mm (0.0043-0.0059 in) |
Ring end gap (Top): | 0.200-0.400 mm (0.0079-0.0157 in) |
Ring end gap (Second): | 0.200-0.400 mm (0.0079-0.0157 in) |
Ring end gap (Oil): | 0.200-0.400 mm (0.0079-0.0157 in) |
Crankshaft main journal diameter (magneto side): | 29.980-30.000 mm (1.1803-1.1811 in) |
Crankshaft main journal diameter (PTO side): | 34.960-34.970 mm (1.3765-1.3770 in) |
Crankpin journal diameter: | 37.000-37.020 mm (1.4567-1.4575 in) |
Crankshaft center distance: | 33.0 mm (1.3 in) |
Cylinder head | |
Valve arrangement: | OHV, gear driven |
Valves: | 2 (4 valves in total) |
Valve steam diameter (INTAKE): | 5.950-5.960 mm (0.2343-0.2346 in) |
Valve steam diameter (EXHAUST): | 5.940-5.950 mm (0.2339-0.2343 in) |
Camshaft lobe height (INTAKE): | 30.330-30.530 mm (1.1941-1.202 in) |
Camshaft lobe height (EXHAUST): | 30.330-30.530 mm (1.1941-1.202 in) |
Camshaft journal diameter (magneto side): | 15.950-15.970 mm (0.628-0.6287 in) |
Camshaft journal diameter (PTO side): | 19.940-19.960 mm (0.785-0.7858 in) |
Tightening torque
Tightening torque specs | |
Alternator (to cylinder) | 2.0 Nm; 1.5 ft·lb |
Air cleaner base (to carburetor) | 7.0 Nm; 5.2 ft·lb |
Air cleaner support bracket | 7.0 Nm; 5.2 ft·lb |
Alternator | 2.0 Nm; 1.5 ft·lb |
Armature | 3.0 Nm; 2.2 ft·lb |
Blower housings | 7.0 Nm; 5.2 ft·lb |
Back plate | 7.0 Nm; 5.2 ft·lb |
Breather | 3.0 Nm; 2.2 ft·lb |
Carburetor to manifold | 7.0 Nm; 5.2 ft·lb |
Connecting rod | 13.0 Nm; 6.9 ft·lb |
Crankcase cover | 17.0 Nm; 12.6 ft·lb |
Cylinder head | 19.0 Nm; 14.1 ft·lb |
Cylinder shield | 7.0 Nm; 5.2 ft·lb |
Exhaust manifold | 17.0 Nm; 12.6 ft·lb |
Flywheel nut | 175.0 Nm; 129.6 ft·lb |
Fan Retainer | 17.0 Nm; 12.6 ft·lb |
Governor lever nut | 8.0 Nm; 5.9 ft·lb |
Governor control bracket | 16.0 Nm; 11.9 ft·lb |
Intake manifold to cylinder head | 16.0 Nm; 11.9 ft·lb |
Oil pump | 7.0 Nm; 5.2 ft·lb |
Rewind starter (to blower housing) | 7.0 Nm; 5.2 ft·lb |
Rocker arm lock nut | 7.0 Nm; 5.2 ft·lb |
Rocker arm stud | 11.0 Nm; 8.2 ft·lb |
Starter motor | 16.0 Nm; 11.9 ft·lb |
Starter motor thru bolts | 6.0 Nm; 4.4 ft·lb |
Valve cover | 3.0 Nm; 2.2 ft·lb |
Service Data
Valve clearance | |
Intake valve clearance (COLD): | 0.10-0.15 mm (0.004-0.006 in) |
Exhaust valve clearance (COLD): | 0.10-0.15 mm (0.004-0.006 in) |
Oil system | |
Lubrication system: | Full pressure by gear-driven oil pump |
Oil type: | SF, SG, SH, SJ or higher |
Recommended oil: |
Summer: SAE 30W Winter: SAE 5W-20, 5W-30 |
Oil capacity: | 1.65 L (1.74 US. qt, 1.45 Imp. qt.) |
Fuel system | |
Type: | Float type, down-draft carburetor |
Ignition system | |
Type: | Electronic |
Spark plug: | Champion RC12YC |
Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
Spark plug torque: | 23 N·m (2.3 kg·m, 17 ft·lb) |
Armature air gap | 0.2-0.3 mm (0.008-0.012 in) |
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