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

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. Remove all parts necessary to gain access to
2. 2. Remove spark plugs to ease the task of turning
3. 3. Use the engine flywheel to turn the crankshaft
4. 4. For the intake valve, a .007" thickness gauge
5. 5. For the exhaust valve, a .012" thickness gauge
6. 6. To correct the valve clearance, use a 7/16" open
7. 7. To adjust valves on the right hand cylinder, turn
8. 8. Replace all parts removed in Step 2. Tighten all
9. 1. Turn the flywheel mounting screw outward about
10. 4. Unscrew the puller from the flywheel, remove the
11. 2. Install flywheel puller on the flywheel.
12. 3. Alternately turn until the wheel snaps loose on the

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.