Rocker Arm Assembly: Service and Repair

Fig. 14 Rocker arm stud removal. Press type studs:

Fig. 15 Rocker arm stud installation. Press type studs:

If studs are loose in cylinder head, .003 inch or .013 inch oversize studs may be installed on all engines with pressed-in type studs, after reaming holes with a proper size reamer. On engines with threaded rocker studs, looseness can be corrected by installing the proper size Heli-Coil insert, or by replacing cylinder head. Replace damaged pressed-in rocker arm studs using the following procedure:
1. Remove the old stud by placing a suitable spacer, Fig. 14, over stud. Install nut and flat washer and remove stud by turning nut.
2. Ream hole for oversize stud.
3. Coat press-fit area of stud with rear axle lube. Then install new stud, Fig. 15. If tool shown is used, it should bottom on the head.