Cummins/Onan — Cleaning Crankcase Breather (Turbocharged Engines)
Maintenance · Crankcase ventilation
From a Cummins/Onan operator's manual covering: C121, DL4, DL6, DL6T, ES1178, FB2, L423, LS1629, TI0. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T, Cummins/Onan L423D engine, Cummins/Onan L634D engine, Cummins/Onan L634T engine
Before you start
- Overtightening the clamp will tear breather cap
Procedure
- Remove breather cap and lift out breather element
- Clean breather cap and element in cleaning solvent, dry with low pressure (under 35 psi/241 kPa) air
- Install clean or new breather element in valve cover, do not pack element
- Install clamp, breather cap, and connect breather tube
Full service-parts list: Cummins/Onan DL6 →
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.