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Cummins/Onan 4.0 BF — The engine assembly procedure is normally the

For the Cummins/Onan 4.0 BF.

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Procedure

  1. 3. Install crankshaft and rear bearing plate .
  2. 4. Install connecting rods, pistons and bearings
  3. 5. Install camshaft and gear .
  4. 10. Install crank gear, aligning crank gear mark with
  5. 12. Install flywheel alternator stator .
  6. 13. Install flywheel .
  7. 14. Install all housings, air cleaner, control box, etc .
  8. 15. Reinstall power plant in vehicle, making proper
  9. 16. Fill crankcase with oil .
  10. 2. Check oil pressure .
  11. 3. Run engine approximately 15 minutes to bring up
  12. 4. Check for oil leaks, security of electrical connec-

Source: manual:965-0515 Onan 4KW BF Power Drawer Major Service Manual (09-1973).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.