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Home›Repair guides›Cummins/Onan›Starting the Engine

Cummins/Onan B43 / B48 — Starting the Engine

Operation

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

Applies to: Cummins/Onan B48, Cummins/Onan B43M engine, Cummins/Onan B48M engine

Before you start

  • Heavy exhaust smoke when the engine is initially started is normal and usually caused by rust inhibitor oil.

Procedure

  1. Place the throttle control in the SLOW position and the choke into the FULL choke position.
  2. Turn the 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 has fouled the plugs, remove, clean in solvent, dry thoroughly and reinstall.
  5. When engine starts, gradually push the choke lever in until the engine runs smoothly.
  6. To stop the engine, turn the ignition switch to the OFF position.

Full service-parts list: Cummins/Onan B48 →

Source: Cummins/Onan owner'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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