The Onan B43E is a 0.7 L (710 cc, 43.33 cu·in) natural aspirated four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, for general-purpose applications.
The cylinder bore is 82.55 mm (3.25 in) and the piston stroke is 66.55 mm (2.62 in). The compression ratio rating is 6.2:1.
The B43E engine produced 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm of maximum horsepower and 44.0 N·m (4.5 kg·m, 32.4 ft·lb) of maximum torque.
The Onan B43E features:
- L-head design
- Carburetor fuel system
- Forced lubrication system
- Air cooling system
- Electric starter
General information
Engine Specifications | |
Engine model | B43E |
Engine type | 4-stroke, L-head, flat |
Displacement | 710 cm3, (43.33 cu·in) |
Max. horsepower | 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm |
Max. torque | 44.0 N·m (4.5 kg·m, 32.4 ft·lb) |
Cooling system | Air-cooled |
Air cleaner | – |
Lubricating system | Forced lubrication |
Ignition system | – |
Fuel system | Carburetor |
Fuel consumption | – |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Starting system | Electric starter |
Dimensions (L x W X H) | – |
Dry weight | – |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 6.2:1 |
Cylinder bore: | 82.55 mm (3.25 in) |
Piston stroke: | 66.55 mm (2.62 in) |
Cylinder internal diameter (standard): | 82.530-82.550 mm (3.2492-3.25 in) |
Piston skirt outer diameter (standard): | 82.42-82.44 mm (3.2449-3.2457 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod small end diameter (standard): | 17.470-17.480 mm (0.6878-0.6882 in) |
Piston pin diameter: | 17.463-17.468 mm (0.6875-0.6877 in) |
Ring end gap (Top): | 0.250-0.510 mm (0.0098-0.0201 in) |
Ring end gap (Second): | 0.250-0.510 mm (0.0098-0.0201 in) |
Number of main bearings: | 2 |
Crankshaft main journal diameter: | 50.780-50.800 mm (1.9992-2 in) |
Crankpin journal diameter: | 41.280-41.300 mm (1.6252-1.626 in) |
Crankshaft center distance: | 33.275 mm (1.31 in) |
Cylinder head | |
Valve arrangement: | L-head, gear driven |
Valves: | 4 (2 per cylinder) |
Valve steam diameter (INTAKE): | 8.700-8.710 mm (0.3425-0.3429 in) |
Valve steam diameter (EXHAUST): | 8.660-8.670 mm (0.3409-0.3413 in) |
Valve spring free length (INTAKE): | 42.210 mm (1.6618 in) |
Valve spring free length (EXHAUST): | 42.210 mm (1.6618 in) |
Camshaft lobe height (INTAKE): | 28.370-28.470 mm (1.1169-1.1209 in) |
Camshaft lobe height (EXHAUST): | 28.370-28.470 mm (1.1169-1.1209 in) |
Camshaft journal diameter: | 34.900-34.910 mm (1.374-1.3744 in) |
Service Data
Cylinder compression: | 517-793 kPa (75 to 115 psi) |
Valve clearance | |
Intake valve clearance (COLD): | 0.130 mm (0.0051 in) |
Exhaust valve clearance (COLD): | 0.330 mm (0.013 in) |
Oil system | |
Lubrication system: | Forced lubrication |
Recommended oil: | SAE 10W-30 |
Oil capacity: |
Without oil filter: 1.4 L (1.48 US. qt, 1.23 Imp. qt.) With oil filter: 1.7 L (1.8 US. qt, 1.5 Imp. qt.) |
Fuel system | |
Type: | Carburetor |
Ignition system | |
Ignition timing: | 16° B.T.D.C. |
Spark plug: | NGK BPR5EF, Champion RS14YC |
Spark plug gap: | 0.640 mm (0.0252 in) |
Breaker point gap | 0.410 mm (0.01610.0161 in) |
Be the first to comment