The Onan P218G is a 782 cc, (47.7 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Onan for general-purpose applications.
The cylinder bore is 82.55 mm (3.25 in) and the piston stroke is 73.00 mm (2.87 in). The compression ratio rating is 7.0:1.
The Onan P218G engine produced 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm of maximum output power.
The Onan P218G features:
- L-haed design
- Electronic battery ignition system
- Carburetor with fixed main jet
- Centrifugal governor
- Full pressure with oil filter lubrication system
- Forced air cooling system
- Electric starter 12V
General information
| Engine Specifications | |
| Engine model | P218G Performer 18 |
| Engine type | 4-stroke, L-head, two-cylinders |
| Displacement | 782 cm3, (47.7 cu·in) |
| Max. horsepower | 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm |
| Cooling system | Forced air |
| Lubricating system | Full pressure with oil filter |
| Ignition system | Electronic battery |
| Fuel system | Carburetor with fixed main jet |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter 12V |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal governor |
| Charging system | Flywheel alternator |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 7.0:1 |
| Cylinder bore: | 82.55 mm (3.25 in) |
| Piston stroke: | 66.55 mm (2.62 in) |
| Cylinder internal diameter (standard): | 82.530-82.530 mm (3.2490-3.2500 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 41.360-41.350 mm (1.6283-1.6279 in) |
| Connecting rod small end diameter (standard): | 17.470-17.480 mm (0.6878-0.6882 in) |
| Piston pin diameter: | 17.470-17.480 mm (0.6878-0.6882 in) |
| Ring Groove Clearance (Top): | 0.076-0.203 mm (0.003-0.008 in) |
| Ring End Gap in Cylinder Clearance: | 0.254-0.508 mm (0.010-0.020 in) |
| Crankshaft Main Bearing Journal Diameter: | 50.800-50.780 mm (2.0000-1.9992 in) |
| Crankpin journal diameter: | 41.300-41.280 mm (1.6260-1.6252 in) |
| Crankshaft center distance: | 33.275 mm (1.31 in) |
| Cylinder head | |
| Valve arrangement: | L-head, gear driven |
| Valves: | 4,(2 valves in total) |
| Valve steam diameter (INTAKE): | 7.099-7.112 mm (0.2795-0.2800 in) |
| Valve steam diameter (EXHAUST): | 7.061-7.074 mm (0.278-0.2785 in) |
| Valve Clearance Stem-to-Guide (INTAKE): | 0.025-0.064 mm (0.0010-0.0025 in) |
| Valve Clearance Stem-to-Guide (EXHAUST): | 0.051-0.089 mm (0.0020-0.0035 in) |
| Valve spring free length (INTAKE): | 40.64 mm (1.6 in) |
| Valve spring free length (EXHAUST): | 40.64 mm (1.6 in) |
| Camshaft lobe height (INTAKE): | 28.88 mm (1.137 in) |
| Camshaft lobe height (EXHAUST): | 29.39 mm (1.1571 in) |
Tightening Torque
| Tightening torque specs | |
| Gearcase cover | 11-14 Nm (8-10 ft-lb) |
| Cylinder head bolts (asbestos gasket) | 22-24 Nm (16-18 ft-lb) |
| Cylinder head bolts (graphoil gasket) | 19-22 Nm (14-16 ft-lb) |
| Rear bearing plate screws | 34-37 Nm (25-27 ft-lb) |
| Starter mounting bolts | 33-35 Nm (24-26 ft-lb) |
| Connecting rod bolt | 19 Nm (14 ft-lb) |
| Flywheel cap screw | 67-75 Nm (50-55 ft-lb) |
| Other 1/4″ cylinder block stud and nuts | 10-12 Nm (7-9 ft-lb) |
| Other 5/16″ cylinder block stud and nuts | 11-14 Nm (8-10 ft-lb) |
| Oil base | 24-31 Nm (18-23 ft-lb) |
| Intake manifold mounting screws | 8-14 Nm (6-10 ft-lb) |
| Oil pump | 10-12 Nm (7-9 ft-lb) |
| Valve cover | 1-3 Nm (1-2 ft-lb) |
| Exhaust manifold mounting screws | 12-15 Nm (9-11 ft-lb) |
Service Data
| Cylinder compression: | 517-793 kPa; 75-115 PSI |
| Valve clearance | |
| Intake valve clearance: | 0.13 mm (0.0051 in) |
| Exhaust valve clearance: | 0.33 mm (0.0130 in) |
| Oil system | |
| Lubrication system: | Full pressure with oil filter |
| Oil type: | API SF, SF/CC, or SF/CD |
| Recommended oil: | SAE 5W-30, 10W-30, 30W, 40W |
| Oil capacity: | Standard base (w/o oil filter): 1.4 L (1.5 US. qt, 1.2 Imp. qt.) High capacity base (w/o oil filter): 2.6 L (2.75 US. qt, 2.3 Imp. qt.) Oil filter: 0.3 L (0.32 US. qt, 0.26 Imp. qt.) |
| Fuel system | |
| Type: | Carburetor with fixed main jet |
| Pilot screw opening: | 1-1/4 turns out |
| Fuel pump type: | Pulse |
| Ignition system | |
| Type: | Electronic battery ignition system |
| Ignition timing: | 20° B.T.D.C. |
| Spark plug: | NGK: BPR5EFS; Champion: RS14YC |
| Spark plug gap: | 0.64 mm (0.0252 in) |
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