The Briggs and Stratton 402437 is a 694 cc, (42.35 cu·in) natural aspirated, opposed two-cylinder, four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, for general-purpose applications.
Cylinder bore is 87.3 mm (3.44 in) and piston stroke is 55.0 mm (2.16 in). The Briggs and Stratton 402437 engine produced 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm of maximum output power and 34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm of peak torque.
The Briggs and Stratton 402437 features:
- L-head design
- Flywheel magneto ignition system
- Float type carburetor
- Mechanical governor
- Full pressure lubrication system
- Forced air cooling system
- Electric starter
General information
Engine Specifications | |
Engine model | B&S 402437 |
Engine type | 4-stroke, L-head, opposed two-cylinder |
Displacement | 694 cm3, (42.35 cu·in) |
Max. horsepower | 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm |
Max. torque | 34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm |
Cooling system | Forced air |
Air cleaner | Paper cartridge with a foam pre-cleaner |
Lubricating system | Full pressure |
Ignition system | Flywheel magneto |
Fuel system | Float type carburetor |
Fuel used | Gasoline |
Starting system | Electric starter |
Governor | Mechanical governor |
Cylinder Block and Head
Cylinder block | |
Cylinder bore: | 87.3 mm (3.44 in) |
Piston stroke: | 58.0 mm (2.28 in) |
Cylinder internal diameter (standard): | 87.280-87.310 mm (3.4362-3.4374 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod big end diameter (standard): | 41.270-41.280 mm (1.6248-1.6252 in) |
Connecting rod small end diameter (standard): | 20.340-20.350 mm (0.8008-0.8012 in) |
Piston pin diameter: | 20.320-20.330 mm (0.8-0.8004 in) |
Side clearance (Top): | 0.090-0.150 mm (0.0035-0.0059 in) |
Side clearance (Second): | 0.090-0.150 mm (0.0035-0.0059 in) |
Side clearance (Oil): | 0.090-0.150 mm (0.0035-0.0059 in) |
Ring end gap (Top): | 0.180-0.430 mm (0.0071-0.0169 in) |
Ring end gap (Second): | 0.180-0.430 mm (0.0071-0.0169 in) |
Ring end gap (Oil): | 0.180-0.430 mm (0.0071-0.0169 in) |
Crankshaft main journal diameter: | 34.990-35.010 mm (1.3776-1.3783 in) |
Crankpin journal diameter: | 41.230-41.250 mm (1.6232-1.624 in) |
Crankshaft center distance: | 27.5 mm (1.085 in) |
Cylinder head | |
Valve arrangement: | L-head, gear driven |
Valves: | 2(4 valves in total) |
Valve steam diameter (INTAKE): | 7.820-7.870 mm (0.3079-0.3098 in) |
Valve steam diameter (EXHAUST): | 7.820-7.870 mm (0.3079-0.3098 in) |
Camshaft lobe height (INTAKE): | 29.270-29.350 mm (1.1524-1.1555 in) |
Camshaft lobe height (EXHAUST): | 28.500-28.580 mm (1.122-1.1252 in) |
Camshaft journal diameter : | 15.850-15.870 mm (0.624-0.6248 in) |
Tightening torque
Tightening torque specs | |
Alternator (to cylinder) | 2.0 Nm; 1.5 ft·lb |
Air cleaner base (to carburetor) | 3.0 Nm; 2.2 ft·lb |
Armature | 3.0 Nm; 2.2 ft·lb |
Blower housings | 10.0 Nm; 7.4 ft·lb |
Breather | 3.0 Nm; 2.2 ft·lb |
Carburetor to intake manifold | 11.0 Nm; 8.1 ft·lb |
Connecting rod | 22.0 Nm; 16.3 ft·lb |
Crankcase sump/cover | 25.0 Nm; 18.5 ft·lb |
Cylinder head | 18.0 Nm; 13.3 ft·lb |
Carburetor to solenoid | 11.0 Nm; 8.1 ft·lb |
Fan Retainer | 17.0 Nm; 12.6 ft·lb |
Flywheel nut | 203.0 Nm; 150.0 ft·lb |
Governor lever nut | 11.0 Nm; 8.1 ft·lb |
Intake manifold to cylinder head | 10.0 Nm; 7.4 ft·lb |
Starter motor | 18.0 Nm; 13.3 ft·lb |
Service Data
Oil system | |
Lubrication system: | Full pressure |
Oil type: | SC, SD, SE or higher |
Recommended oil: |
Summer: SAE 30, 10W-30 Winter: SAE 5W-30 |
Oil capacity: | 1.70 L (1.8 US. qt, 1.5 Imp. qt.) |
Fuel system | |
Type: | Float type carburetor |
Ignition system | |
Type: | Flywheel magneto |
Spark plug: |
Champion RJ-12, AC R-46, Autolite 308 |
Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
Spark plug torque: | 22 N·m (2.2 kg·m, 16.2 ft·lb) |
Point gap | 0.51 mm (0.020 in) |
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