Cummins/Onan 4MCCK / 605MCCK — Oil Pressure Relief Valve Adjustment
Adjustments
For the Cummins/Onan 4MCCK / 605MCCK, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 605MCCK, Cummins/Onan MCCK, Cummins/Onan MCCK engine
Procedure
- Loosen the lock nut on the slotted stud located just below the governor linkage.
- Turn the stud in to increase oil pressure, out to decrease pressure.
- Always tighten the lock nut after making an adjustment.
Specs & values
- Oil pressure at operating temperature should be between 25 and 40 pounds
Full service-parts list: Cummins/Onan 605MCCK →, Cummins/Onan MCCK →
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.