Cummins/Onan 4MCCK / 605MCCK — Cylinder Head Torque and Retorque
Maintenance · Cylinder heads
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
- Torque cylinder heads at room temperature according to the torque sequence.
- After the engine has reached normal hot temperature and cooled to room temperature, retorque the cylinder head bolts to the original specified torque.
- Retightening should be done before the engine has been run fifty operating hours.
Tools required
- torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.