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Cummins/Onan — Block Service:

For these Cummins/Onan models: BGM, NHM.

Applies to: Cummins Onan Nhm

Procedure

  1. 1. Remove the cooling system panels, muffler
  2. 2. Remove the flywheel. See Flywheel Removal.
  3. 3. Disconnect the lead connected at the low oil
  4. 4. Remove the four capscrews that secure the in-
  5. 5. Thoroughly clean the engine cooling fins.

Source: manual:965-0531B Onan BGM NHM Marquis series RV Genset Service manual (02-1991).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.