With hydraulic lifters no adjustment. The retainers for the rockers are torqued at 19 ft/lbs. Keeter 6227 had the right call. It is oil change as in brand and an additive for a mild rattle in the valve train. The 2.5L is famous for a little noise. Someone the other day had the same problem and tried a high milage oil don't remember the brand hope all this helps.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184