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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