The Briggs and Stratton 386777 Vanguard is a 627 cc, (38.2 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion gasoline engine with a vertical shaft, for general-purpose applications.
Cylinder bore and piston stroke are 75.5 mm (2.97 in) and 70.0 mm (2.75 in), respectively. This engine produced 23.3 PS (17.1 KW; 23.0 HP) at 3,600 rpm of horsepower.
The B&S 386777 features:
- OHV design
- Electronic ignition system
- Float type, side-draft carburetor
- Centrifugal governor
- Pressure lubrication, oil cooler
- Forced air cooling system /li>
- Electric starter
General information
| Engine Specifications | |
| Engine model | 386777 Vanguard |
| Engine type | 4-stroke, OHV, V-twin |
| Displacement | 627 cm3, (38.2 cu·in) |
| Max. horsepower | 23.3 PS (17.1 KW; 23.0 HP) at 3,600 rpm |
| Max. torque | – |
| Cooling system | Forced air |
| Air cleaner | Dual-Clean (paper element with a foam pre-cleaner) |
| Lubricating system | Pressure lubrication, oil cooler |
| Ignition system | 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) | 407 x 428 x 319 mm (16.1 x 16.9 x 12.6 in) |
| Dry weight | 44.8 kg (98.0 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Cylinder bore: | 75.5 mm (2.97 in) |
| Piston stroke: | 70.0 mm (2.75 in) |
| Cylinder internal diameter (standard): | 75.500-75.520 mm (2.9724-2.9730 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): | 18.040-18.050 mm (0.7100-0.7105 in) |
| Piston pin diameter: | 18.000-18.010 mm (0.7085-0.7090 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): | 34.990-35.010 mm (1.3776-1.3784 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: | 35.0 mm (1.38 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): | 31.090-31.300 mm (1.2240-1.2320 in) |
| Camshaft lobe height (EXHAUST): | 30.330-30.530 mm (1.1940-1.2020 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: | 0.10-0.15 mm (0.004-0.006 in) |
| Exhaust valve clearance: | 0.10-0.15 mm (0.004-0.006 in) |
| Oil system | |
| Lubrication system: | Pressure lubrication, oil cooler |
| 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, side-draft carburetor |
| Ignition system | |
| Type: | Electronic |
| Spark plug: | Champion RC12YC Champion XC92YC |
| 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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