Valve Rocker Arm Covers.

g. V a l v e R o c k e r A r m C o v e r s .

( b ) Replace cylinder assembly when valve

r o c k e r cover does not conform to limits specified

(1) Repair or replace damaged parts.

W e l d i n g is permissible on the two valve rocker

in the overhaul standards (table 6-15).

arm shaft plug bosses on the outside of the cover.

W e l d i n g in other areas of the cover is n o t p e r -

as instructed in paragraph 6-5.

missible. Refer to paragraph 6-4c for general

(d) Replace cracked adjusting cover

welding instructions, and paragraph (e), below.

plates. Remove minor nicks, burs, or scratches

(a) Replace cylinder assembly when

f r o m mating surface with crocus cloth dipped in

v a l v e rocker arm cover is cracked (except at the

dry-cleaning solvent or mineral spirits paint

rocket arm shaft plug boss which can be welded),

thinner.

or has deep scratches or nicks on the mating

(e) Covers that have been repaired by

w e l d i n g must meet the requirements specified in

surface or camshaft bearing bore surface.

figure 6-64.

Replace cylinder when cover damage cannot be

removed by polishing with crocus cloth dipped in

dry-cleaning solvent or mineral spirits paint

thinner.

AT 311 77

Figure 6-64. Valve rocker arm cover welding standards.

( 1 ) Replace cracked or deeply scored rocker

h. Valve Rocker Arm. (Refer to fig. B-4)

arm shaft assemblies (22 and 35).

( 1 ) Replace valve rocker arms (33 and 34)

(2) Replace rocker arm shafts that do not

when cracked or worn or if the bushing-type

conform to limits specified in the overhaul

bearings are damaged.

standards (table 6-15).

(2) Replace damaged valve rocker arm

Valve, Springs, Spring Retainers and

roller and bushing.

Rotors. (Refer to fig. B-4)

(3) Replace adjusting screw (36) when

(1) Valves.

threads are stripped or damaged or when screw

binds in rocker arm. Replace adjusting screw

(a) Discard warped valves (11 and 12) or

valves which do not conform to limits specified in

w h e n swivel pad does not rotate freely on screw.

repair and, rebuild standards (table 6-1 5).

i. Valve Rocker Arm Shaft Assemblies.

Discard valves having badly pitted or burned

(Refer to fig. B-4)

6-73