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Cummins/Onan — Repair:

For these Cummins/Onan models: 5.0BF - 34 3E, S.OSF - 34 IE.

Applies to: Cummins Onan 5 0Bf 34 3E, Cummins Onan S Osf 34 Ie

Procedure

  1. 1. A hone can be used to refinish a cylinder.
  2. 2. Anchor the block solidly for either vertical or
  3. 3. Connect drill to hone and start drill. Move the
  4. 4. Check the diameter of the cylinder regularly
  5. 5. The Crosshatch formed by the scratching of the
  6. 6. Clean the cylinder block thoroughly with soap,
  7. 7. Dry the crankcase and coat it with oil.

Source: manual:965-1003 Onan BF Welder Parts and Service Manual (9-1973).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.