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Page Title:
VALVE ROCKER ARM PUSH RODS AND TAPPETS |
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 adjusting screw (C-3) for stripped or
of illustrations and instructions to assemble
damaged threads. Check pad for scor-
the front set of valve rocker arms.
ing, nicks, burs, or scratches. Check
nut (C- 1) for damaged threads.
TAPPETS
(b) I n s p e c t rocker arm shaft (E) for
Note. The key letters shown below in paren-
cracks, nicks, and scoring. Check
plug (D) to be certain it is secure in
theses refer to figure 385 except where other-
the shaft, and that oil passage is clean
wise indicated.
and free of obstructions. Check shaft
to limits specified in repair and re-
--. Cleaning and Inspection.
a
build standards (par. 294).
(1) Cleaning. Clean the 12 valve rocker
(c) Inspect valve rocker supports (F) for
arm push rods (T) and 12 valve tappets
cracks, nicks, and scoring. Check oil
(S) as directed in paragraph 152.
passage to be sure it is clean and free
of obstructions. Inspect thrust washer
(2) I n s p e c t i o n . Check valve tappets (fig.
(B) for wear, cracks, and distortion.
scratches, a n d evidence of a wear
(d) Inspect thrust springs (J) for wear,
pattern. Check push rod socket for dam-
c r a c k s , set, or other evidence of
age from pounding. Check tappet against
failure. Check springs against limits
limits specified in repair and rebuild
specified in repair and rebuild stan-
standards (par. 294). Inspect the valve
dards (par. 295).
rocker arm push rods (fig. 392) for
roughness, scratches, grooves, or evi-
N o t e . Valve rocker arms do not
dence of loose ball or socket ends.
incorporate replaceable bushing-type
Check rod straightness by rolling on
surface plate. Replace bent push rods.
b e a r i n g s . Replace rocker arms if
bearings are worn or damaged.
Replace rods which do not meet limits
specified in repair and rebuild stan-
- . Repair.
c --
dards (par. 294).
(1) Replace valve rocker arm assemblies
(C) when cracked, or when bearing suf-
faces are loose, scored, or when arms
do not meet limits specified in repair
and rebuild standards (par. 294). Re-
place adjusting screw and nut when
threads are damaged or when screw
binds in rocker arm.
(2) Replace cracked or deeply scored valve
rocker arm shaft (E). Replace shafts
that do not meet limits specified in re-
pair and rebuild standards (par. 294).
(3) Replace damaged rocker arm supports
(F), thrust washer (B), and retaining
VALVE ROCKER ARM PUSH RODS AND
ring (A).
VALVE TAPPETS.
(4) Replace thrust springs (J) when worn
b. Repair. Remove slight discoloration from
or cracked. Replace springs that do not
tappets and valve rocker arm push rods using
meet limits specified in repair and re-
crocus cloth soaked in mineral spirits paint
build standards (par. 294).
thinner. Replace tappets when scored or when
minor repairs fail to make tappets serviceable.
d. Assembly. Refer to paragraph 92 f and
Replace tappets when not within limits specified
in repair and rebuild standards (par. 294).
244
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