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Home›Repair guides›Cummins/Onan›Initial Start and Break-In

Cummins/Onan DJ30 — Initial Start and Break-In

Operation · Engine

For the Cummins/Onan DJ30, from the Cummins/Onan service manual.

Applies to: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T, Cummins/Onan DJA engine

Before you start

  • Do not use ether starting aids; ether is extremely explosive

Procedure

  1. Check the engine has been filled with oil and fuel.
  2. Prime a dry fuel system and return the priming lever to the disengaged position.
  3. Preheat for 20 seconds in ambients above 55 F.
  4. Hold preheat switch, push fuel solenoid ON, press START.
  5. Release start switch after engine starts and reaches speed.
  6. Oil pressure should read at least 20 psi.

Specs & values

  • 25 psi or higher at normal operating temperature

Full service-parts list: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T →

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.

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