Cummins/Onan — Supplemental Coolant Additive

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

1. Step Timing Control
2. 83.9 and B5.9 Series Engines
3. 1 ........................
4. 83.9 and 85.9 Series Engines
5. 83.9 and 85.9 Series Englnes
6. 83.9 and B5.9 Series Engines
7. 1. Engine Serlal Number (ESN)
8. 2. Control Parts List (CPL).
9. 83.9 and 85.9 Series Engines
10. 5.9 = DisDlacement

Source: manual:LeeBoy-Cummins-B3.9-B5.9-Engine-Manuals.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.