The Cummins/Onan J120 engine line groups 3 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 140B640 | Element, Air Cleaner (foam type) | Air filter |
| 140B641 | Retainer, Air Cleaner Element | Air filter |
| 19181 | Voltage Regulator Complete with Rheostat and Knob | Avr |
| 19181-1 | Element, Regulator Plug-In | Avr |
| 18383 | Brush, Exciter | Brush |
| 18773 | Brush, AC | Brush |
| 101K358 | Gasket Kit, Rear Bearing Plate | Gasket |
| 102B475 | Gasket, Oil Base | Gasket |
| 103C218 | Gasket, Backplate | Gasket |
| 110B1223 | Gasket, Cylinder Head | Gasket |
| 140C584 | Gasket, Air Cleaner | Gasket |
| 141A281 | Gasket, Carburetor Flange | Gasket |
| 149K875 | Repair Kit, Fuel Pump (diaphragm assy, valves & gaskets) | Gasket |
| 149P517 | Gasket, Fuel Pump Bowl | Gasket |
| 120B561 | Line, Oil, Rocker Cover | Hose |
| 19306 | Hose, Auxiliary Fuel (10 ft) | Hose |
| 19307 | Fitting, strt - .500FNPT x M22 x 1.50 | Hose |
| 110B1413 | Valve, Intake | Service part / kit |
| 113A80 | Ring, Piston, Top Compression (STD) | Service part / kit |
| 114-181 | Bearing, Connecting Rod, Upper or Lower Half | Service part / kit |
| 120A539 | Valve, Oil By-pass | Service part / kit |
| 120A555 | Spring, Oil By-pass | Service part / kit |
| 143K241 | Repair Kit, Carburetor | Service part / kit |
| 162-227 | Condenser (WICO X6916) | Service part / kit |
| 162-246 | Coil (WICO X5700B) | Service part / kit |
| 162-247 | Rotor (WICO Y5710) | Service part / kit |
| 410A1221 | Spring, Valve | Service part / kit |
| J10A860 | Valve, Exhaust, Stellite | Service part / kit |
| 120B547 | Pump Assy, Oil | Pump |
| 509-86 | Seal, Oil - Crankshaft Rear | Seal |
| 509-87 | Seal, Oil - Gear Cover | Seal |
| 509A90 | Seal, Oil - Intake Valve | Seal |
| 509P88 | Seal, Oil, Governor Shaft | Seal |
| 193P122 | Gauge, Oil Pressure | Sensor |
| 809A169 | Switch, Low Oil Pressure Cut-off | Sensor |
| 14P32 | Suppressor, Spark Plug | Spark plug |
| 187-4 | Plug, Spark (Champion H-8 or Equal) | Spark plug |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.