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Cummins/Onan 4.0 BF — Tappet Adjustment : The engine is equipped with

For the Cummins/Onan 4.0 BF.

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Procedure

  1. 7. To adjust valves on the right hand cylinder-turn
  2. 8. Replace all parts removed in Step 1 . Tighten all
  3. 2. ADJUSTING VALVES
  4. 2. Install a puller bar on the flywheel as shown in

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.