Onan P224G

Onan P224GThe 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
ModelOnan P224G (Performer 24)
Type4-stroke, L-head, flat
Displacement983 cm3 (60.0 cu-in)
Max. horsepower24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm
Max. torque
Fuel systemCarburetor with fixed main jet
Cooling systemForced-air
Ignition systemElectronic battery ignition system ignition system
Lubricating systemForced lubrication
Starting systemElectric starter
PTO shaft rotationClockwise (viewed from flywheel)

Cylinder Block and Head

Cylinder block
Compression ratio:7.0:1
Bore x Stroke90.4 X 76.2 mm (3.56 x 3.00 in)
Sleeve internal diameter90.510-90.490 mm (3.5634-3.5626 in)
Ring end gapTop/Second0.254-0.508 mm (0.01-0.02 in)
Connecting rod small end ID19.060-19.070 mm (0.7504-0.7508 in)
Piston pin outer diameter19.060-19.070 mm (0.7504-0.7508 in)
Crankpin diameter44.460-44.480 mm (1.7504-1.7512 in)
Crankshaft main journal diameter50.780-50.800 mm (1.9992-2 in)
Cylinder Head
Valve Arrangement:L-haed, gear driven
Valves:4 (2 per cylinder)
Stem outer diameter (standard):INTAKE8.700-8.712 mm (0.3425-0.343 in)
EXHAUST8.661-8.687 mm (0.341-0.342 in)
Valve spring free length:42.21 mm (1.6618 in)
Lobe height:INTAKE29.640 mm (1.1669 in)
EXHAUST29.390 mm (1.1571 in)

Service Information

Maximum speed3,600
Cylinder compression517-793 kPa (75 to 115 psi)
Valve clearance
Intake valve clearance0.130 mm (0.0051 in)
Exhaust valve clearance0.330 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 timing20° B.T.D.C.
Spark plugNGK BPR5EFS, Champion RS14YC
Spark plug gap0.640 mm (0.0252 in)
ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. Is it negitive ground? My voltage regulator was smoking? 24 HP Onan engine in J.D. skidsteer. THANKS Bob

  2. Tengo un OL24/01011H
    —I00X217010 necesito saber la information del motor m dijeron q comienza con LX

    Necesito reemplazar el motor

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