Cummins/Onan DJ30 — Install Cylinder Head Assembly
Repair & overhaul
For the Cummins/Onan DJ30, from the Cummins/Onan service manual.
Applies to: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T, Cummins/Onan DJA engine
Procedure
- Install the head assembly and gasket to the cylinder block.
- Tighten head bolts clockwise starting with the 12 o'clock position.
- Follow the order around the clockface, finishing at the 10 o'clock position.
- Torque the bolts evenly to 44-46 ft-lbs.
- After the first 50 hours, retighten the cylinder head bolts and check valve clearance.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 44-46 ft-lbs
Full service-parts list: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T →
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.