Cummins/Onan P218 / P220 — Spark Plug Replacement
Maintenance · Spark plugs
For the Cummins/Onan P218 / P220, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan P218, Cummins/Onan P220
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan P218, Cummins/Onan P220. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Thread the spark plug in by hand until it seats to prevent cross-threading.
- Turn it with a wrench an additional 1/16 turn (22-1/2°).
- If using a torque wrench, tighten the 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)
- Torque 11 lbs-ft (14 N-m)
- An additional 1/16 turn (22-1/2°) if no torque wrench
Full service-parts list: Cummins/Onan P218 →, Cummins/Onan P220 →
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.