Cummins/Onan B48 — Starting the Engine
Operation
For the Cummins/Onan B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48, Cummins/Onan B48M engine
Before you start
- If plug fouling occurs, remove and clean plugs in solvent before reinstalling.
- Heavy exhaust smoke during initial start is normal from rust inhibitor oil.
Procedure
- Place throttle control in SLOW position
- Place choke into FULL choke position
- Turn ignition switch ON and engage starter
- If engine fails to start after 30 seconds, wait 1 minute before recranking
- When engine starts, gradually push choke lever in until engine runs smoothly
- If black smoke and rough running occur, engine is over-choked
- To stop engine, turn ignition switch to OFF position
Full service-parts list: Cummins/Onan B48 →
Source: Cummins/Onan service 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.