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Home›Repair guides›Head 1, Coolant Flow from Cylinder Block

Cummins/Onan — Head 1, Coolant Flow from Cylinder Block

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

  1. Coolant Flow Past Injector 5, By-Pass Closed
  2. Thermostat 6. Coolant Flow Back to
  3. Coolant By-Pass Passage Radiator
  4. Coolant Flow to Pump Inlet ¢*)

Source: manual:CONTENTS-Cummins-B-Series-Troubleshooting-Repair-3666087-588pages.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.