Cummins/Onan — Push Tubes Inspection
Maintenance
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Clean push tubes in solvent and dry with compressed air.
- Check injector and valve push tube ball end for wear.
- Check socket wear with ball end of new rocker lever adjusting screw.
- Check for bent push tubes.
- Shake tubes to see if oil has leaked into them.
- Replace tubes if internal leakage noted.
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.