Cummins/Onan 3.6MKY / 4MKY — Rocker Arms, Push Rods and Cylinder Head Removal
Repair & overhaul
For the Cummins/Onan 3.6MKY / 4MKY, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 3.6MKY, Cummins/Onan 4MKY
Before you start
- Warping can occur if the head is removed while hot; wait until the engine has cooled.
Procedure
- Remove the rocker arm mounting nuts, rocker arms and push rods.
- Remove the spark plug.
- Remove the cylinder head mounting bolts and pull off the cylinder head.
- Remove all carbon deposits from the cylinder head.
- Clean the cylinder block and head gasket mating area and install a new head gasket.
- Place the head in position and tighten bolts to 11 lb-ft (15 N-m) in the sequence shown, then to specified torque.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Initial 11 lb-ft (15 N-m)
- Cylinder head bolts cold #1 and #6 12-16 FridayParts $159.99 lb-ft
- #2 thru #5 31-37 lb-ft
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.