Onan P224G

Onan P224GThe Onan P224G is a 983 cc, (60.0 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 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 maximum output power.

The Onan P224G features:

  • L-head 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 modelP224G Performer 24
Engine type4-stroke, L-head, two-cylinders
Displacement983 cm3, (60.0 cu·in)
Max. horsepower24.3 PS (17.9 kW; 24.0 HP) at 3,600 rpm
Cooling systemForced air
Lubricating systemFull pressure with oil filter
Ignition systemElectronic battery
Fuel systemCarburetor with fixed main jet
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter 12V
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
Charging systemFlywheel alternator
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:7.0:1
Cylinder bore:90.4 mm (3.56 in)
Piston stroke:76.2 mm (3.00 in)
Cylinder internal diameter (standard):90.510-90.490 mm (3.5634-3.5626 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (standard):44.460-44.480 mm (1.7504-1.7512 in)
Connecting rod small end diameter (standard):19.060-19.070 mm (0.7504-0.7508 in)
Piston pin diameter:19.060-19.070 mm (0.7504-0.7508 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):8.700-8.712 mm (0.3425-0.343 in)
Valve steam diameter (EXHAUST):8.661-8.687 mm (0.341-0.342 in)
Valve Clearance Stem-to-Guide (INTAKE):0.025-0.064 mm (0.0010-0.0025 in)
Valve Clearance Stem-to-Guide (EXHAUST):0.064-0.102 mm (0.0025-0.0040 in)
Valve spring free length (INTAKE):42.21 mm (1.6618 in)
Valve spring free length (EXHAUST):42.21 mm (1.6618 in)
Camshaft lobe height (INTAKE):29.640 mm (1.1669 in)
Camshaft lobe height (EXHAUST):29.390 mm (1.1571 in)

Service Data

Cylinder compression pressure:517-793 kPa; 75-115 PSI
Valve clearance
Intake valve clearance (COLD):0.13 mm (0.0051 in)
Exhaust valve clearance (COLD):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:1-1/2 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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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