Cummins/Onan — Replacing the Spark Plug(s)
Maintenance · Ignition
From a Cummins/Onan operator's manual covering: 5.5 HGJAD, 5.5 HGJAD/HGJAE, 5.5 HGJAE, 6.5 HGJAE, 7.0 HGJAD, 7.0 HGJAD/HGJAE, 7.0 HGJAE. Check it applies to your exact model before use.
Applies to: Cummins/Onan 5.5 HGJAD, Cummins/Onan 5.5 HGJAE, Cummins/Onan 6.5 HGJAE, Cummins/Onan 7.0 HGJAD, Cummins/Onan 7.0 HGJAE, Cummins/Onan HGJAD, Cummins/Onan HGJAE
Procedure
- Remove front access cover
- Unscrew spark plug and remove
- Thread spark plug in by hand until seated, tighten to 13 Nm (10 ft-lbs)
- Replace front access cover
Specs & values
- Torque 13 Nm (10 ft-lbs)
Full service-parts list: Cummins/Onan 5.5 HGJAD →, Cummins/Onan 5.5 HGJAE →, Cummins/Onan 6.5 HGJAE →, Cummins/Onan 7.0 HGJAD →, Cummins/Onan 7.0 HGJAE →, Cummins/Onan HGJAD →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.