Cummins/Onan W3M-19 — Spark Plug Service
Maintenance · Spark plugs
For the Cummins/Onan W3M-19, from the Cummins/Onan service manual.
Applies to: Cummins/Onan W3M-19, Cummins/Onan W2C engine
Procedure
- Remove the spark plugs.
- Clean and inspect for cracked or badly eroded porcelain or electrodes.
- Discard any plug not in good condition and replace with Champion 6M.
- Adjust gap to .030 in.
- Make sure gaskets are in place when installing.
- Tighten securely.
Tools required
- Spark plug wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- .030 in. gap
- Champion 6M
Full service-parts list: Cummins/Onan W3M-19 →
Source: Cummins/Onan service 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.