Using a thin, sharp punch, remove the cup plug (25, Figure 9-2) from the rocker arm shaft (11).
Dry cleaning solvent PD-680, Type III, or equivalent, is flammable, and moderately toxic to the
skin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratory
protection Is required to avoid Injury to personnel.
Compressed air used for cleaning or drying can create airborne particles that may enter the
eyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles Is required to avoid
Injury to personnel.
Flush the bore of the rocker arm shaft (11) thoroughly with dry cleaning solvent, PD-680, Type III, or
equivalent, and blow dry with compressed air.
Using a 0.156 inch (3.96 mm) diameter pin punch, install a new cup plug (25) in the rocker arm shaft (11).
If worn beyond the limits given in Table 1-4, replace the bushings (27 and 28) in the rocker arms (12, 13,
and 14) using mandrel ST-1 284 and an arbor press.
Remove minor scoring or wear damage to the crosshead contact surface of the rocker arms (12 and 14) by
grinding to the original contour using ST-684 or equivalent. After grinding, dean thoroughly and be sure
the oil passage hole in the contact surface is not obstructed.
Replace worn injector lever socket seats (26) as follows:
Drill a 0.125 inch (3.2 mm) hole through the injector rocker arm (1 3) centered on and above the
socket seats (26). Drive out the socket using a suitable pin punch.
Remove all chips and burrs caused by drilling, and plug the hole drilled in the injector rocker arm
(13) using a blind pull rivet MS20600-AD4W2.
Install a new ball socket seat (26) in the injector rocker arm (13) using a soft drift and hammer. Be
sure the socket seat is firmly seated.
Replace all worn adjusting screws (16) and nuts (15).
Remove minor defects in gasket surfaces of the rocker arm housing (20) using a flat mill file. Discard the
housing for all other defects.
Replace worn adjusting screws (10, Figure 9-1) and nuts (9) in the crossheads (8). Discard the crossheads
for all other defects.
Replace. Replace the rocker arm housings, crossheads, rocker arms, and valve covers in accordance with
9-14. PUSH RODS AND FOLLOWERS MAINTENANCE.
Inspect. (See Figure 9-13.)
Remove the cam follower covers in accordance with step b, below.
Rotate the engine to line up one set of valve set marks, and rotate push rods (1 and 2) by hand while
feeling for roughness, and visually checking for push rod runout. Runout shall not exceed 0.025 inch (0.64
Rock the cam followers (12 and 13) from side-to-side while feeling for excess play between the cam
followers and shaft (14). Clearance shall not exceed 0.004 inch (0.10 mm).
Rotate the cam follower rollers (18 and 20), and visually inspect for wear, scoring, galling, flaking, or
If galling, flaking, or chipping of the rollers is noted, the mating camshaft lobe should be
carefully inspected in accordance with paragraph 9-15.
Rotate the cam follower rollers (18 and 20) and check for binding, excessive clearance between the rollers
and pins (17 and 19), and excessive side clearance. The clearance between the rollers and pins shall not
exceed 0.008 inch (0.20 mm), and side clearance shall not exceed 0.024 inch (0.61 mm).