Cummins/Onan — Clean Injection Nozzle
Maintenance
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DJB engine
Before you start
- Never use hard or sharp tools, emery paper, grinding powder or abrasives of any kind
- Separate and label all components of each nozzle; never interchange components between nozzles
Procedure
- Soak each nozzle in fuel to loosen dirt.
- Clean the inside with a small strip of wood soaked in oil and the spray hole with a wood splinter.
- Clean outer surfaces with a brass brush but do not scrape carbon from the nozzle surfaces.
- Clean the nozzle valve with a soft oil-soaked rag or mutton tallow and felt.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.