The Onan P224G (Performer 24) is a 983 cc (60.0 cu-in) two-cylinder air-cooled four-stroke internal combustion small gasoline engine with a horizontal shaft manufactured by Onan for general-purpose applications.
The P224G engine has an L-head design with two flat cylinders, an aluminum cylinder block, a carburetor fuel system, an electronic battery ignition system, and an electric starter.
The cylinder bore is 90.4 mm (3.56 in) and the piston stroke is 76.2 mm (3.00 in), the compression ratio rating is 7.0:1. The Onan P224G engine produced 24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm of horsepower.
The breakdown of the engine code is as follows:
- P – Engine Family
- 2 – Two cylinder
- 24 – 24.0 BHP power
- G – Gasoline
General information
| Engine Specifications | |
| Model | Onan P224G (Performer 24) |
| Type | 4-stroke, L-head, flat |
| Displacement | 983 cm3 (60.0 cu-in) |
| Max. horsepower | 24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm |
| Max. torque | – |
| Fuel system | Carburetor with fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Electronic battery ignition system ignition system |
| Lubricating system | Forced lubrication |
| Starting system | Electric starter |
| PTO shaft rotation | Clockwise (viewed from flywheel) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 7.0:1 | |
| Bore x Stroke | 90.4 X 76.2 mm (3.56 x 3.00 in) | |
| Sleeve internal diameter | 90.510-90.490 mm (3.5634-3.5626 in) | |
| Ring end gap | Top/Second | 0.254-0.508 mm (0.01-0.02 in) |
| Connecting rod small end ID | 19.060-19.070 mm (0.7504-0.7508 in) | |
| Piston pin outer diameter | 19.060-19.070 mm (0.7504-0.7508 in) | |
| Crankpin diameter | 44.460-44.480 mm (1.7504-1.7512 in) | |
| Crankshaft main journal diameter | 50.780-50.800 mm (1.9992-2 in) | |
| Cylinder Head | ||
| Valve Arrangement: | L-haed, gear driven | |
| Valves: | 4 (2 per cylinder) | |
| Stem outer diameter (standard): | INTAKE | 8.700-8.712 mm (0.3425-0.343 in) |
| EXHAUST | 8.661-8.687 mm (0.341-0.342 in) | |
| Valve spring free length: | 42.21 mm (1.6618 in) | |
| Lobe height: | INTAKE | 29.640 mm (1.1669 in) |
| EXHAUST | 29.390 mm (1.1571 in) | |
Service Information
| Engine | |
| Maximum speed | 3,600 |
| Cylinder compression | 517-793 kPa (75 to 115 psi) |
| Valve clearance | |
| Intake valve clearance | 0.130 mm (0.0051 in) |
| Exhaust valve clearance | 0.330 mm (0.0130 in) |
| Oil system | |
| Oil type: | API SF, SF/CC, or SF/CD |
| Recommended oil: | SAE 5W-30, 10W-30, 30W, 40W |
| Oil capacity |
Without oil filter: Standard base: 1.4 L (1.5 US. qt, 1.2 Imp. qt.) High capacity base: 2.6 L (2.75 US. qt, 2.3 Imp. qt.) Oil filter: 0.3 L (0.32 US. qt, 0.26 Imp. qt.) |
| Ignition system | |
| Ignition timing | 20° B.T.D.C. |
| Spark plug | NGK BPR5EFS, Champion RS14YC |
| Spark plug gap | 0.640 mm (0.0252 in) |
I have a P224G engine on my LT40HD sawmill. I am having problems with the engine and think the right piston wrist pin has come loose or wallered out. either way I am looking at a rebuild or replacing the engine. Do you have a rebuilt engine or have rebuild kits or do rebuilds. I’ll need gaskets seals and at least one piston maybe the rod as well. The model number is P224G-I7084. Thank you!
I don’t think these folks sell parts.
The old onan p224 parts are getting impossible to find. It’s worth the money to just repower.
I’ve seen good things with the harbor freights predator 670. It cost around $1000. Vs. the Honda gx690 @ $3500. Which is the recommended replacement engine.