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Home›Repair guides›Cummins/Onan›Engine Starting

Cummins/Onan B43 / B48 — Engine Starting

Operation

For the Cummins/Onan B43 / B48, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan B48

Before you start

  • Heavy exhaust smoke when the engine is initially started is normal and usually caused by rust inhibitor oil. Black smoke and rough running usually indicate over-choking.

Procedure

  1. Place throttle control in the SLOW position and choke in the FULL choke position.
  2. Turn ignition switch on and engage starter.
  3. If engine fails to start after 30 seconds determine the cause; wait one minute before recranking.
  4. If rust inhibitor oil fouled the plugs, remove plugs, clean in solvent, dry thoroughly and reinstall.
  5. When engine starts, gradually push choke lever in until engine runs smoothly.
  6. To stop engine, turn ignition switch to the OFF position.

Full service-parts list: Cummins/Onan B48 →

Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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