Cummins/Onan — Spark Plug Replacement
Maintenance · Ignition System
From a Cummins/Onan operator's manual covering: E124V, E125, E140, P216, P218, P220, P224, P248. Check it applies to your exact model before use.
Applies to: Cummins/Onan E124V, Cummins/Onan E125, Cummins/Onan E140, Cummins/Onan P216, Cummins/Onan P218, Cummins/Onan P220, Cummins/Onan P248
Procedure
- Refer to Table 2 for scheduled spark plug replacement and Specifications for gap specifications.
- To prevent crossthreading, always thread spark plug in by hand until it seats.
- Turn it with a wrench an additional 1/16 turn (22-1/2°).
- If you have a torque wrench, tighten spark plugs to 11 lbs-ft (14 N-m).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap: 0.025 inches (0.64 mm)
- Spark plug tightening torque: 11 lbs-ft (14 N-m)
Full service-parts list: Cummins/Onan E124V →, Cummins/Onan P216 →, Cummins/Onan P218 →, Cummins/Onan P220 →, Cummins/Onan P248 →
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.