Cummins/Onan — The following text contains inspection procedures

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. Piston Inspection:
2. 2. Connecting Rod Inspection:
3. 3. Fitting Pistons:
4. 2. Fitting Piston Rings:
5. 1. Make a thorough check for cracks. Minute cracks
6. 2.
7. 3.
8. 4. Record measurements taken lengthwise at the top

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.