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Cummins/Onan 4.0 BF — Removal:

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Procedure

  1. 3. Remove the ridge from the top of each cylinder
  2. 4. Turn the crankshaft until the piston is at the

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.