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Cummins/Onan 4.0 BF — Inspection :

For the Cummins/Onan 4.0 BF.

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Procedure

  1. 2. Inspect the cylinder bore for scoring and cooling
  2. 3. Check the cylinder bore for taper, out of round
  3. 4. Record measurements taken lengthwise 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.