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16
Chapter
1-General Engine Overhaul, Inspection, and Repair
fig.
8-Push
Rod Runout Check
A
suitable
check
for bent push rods can be made
while
they
are installed in the engine by rotating them
(valve closed) or
they
can be checked between ball
and
cup centers with a dial indicator (fig.
8)
.
If the
total
runout
of
a push rod
exceeds
0.020 inch,
at any point, discard the rod. Do not
attempt
to
straighten.
(2) REPAIRS. If the clearance between the shaft
and rocker arms is excessive, replace the
shaft and/or
the rocker arms. Replace all rocker
arms
that have
severely scored or scuffed bores
and/or
grooved pads.
Replace all severely
scored
or scuffed rocker
shafts.
Dress
up
minor nicks or scratches. Replace
all
damaged
adjusting screws, lock nuts,
and
springs.
Replace the
oil
drain tube
if
it is cracked
or
has
a
sharp bend.
b. Cylinder Heads.
To protect the machined surfaces
of
the
cylinder
heads, do not remove the holding fixture
while
the
heads
are off
.the
engine.
(1) CLEANING
A.ND INSPECTION. With the valves
installed to protect the valve
seats,
remove
carhon
deposits from the combustion chamber
and valve heads
with
a
scraper
and a wire
brush. Be
careful
not to
scratch the gasket
surface.
Clean the heads
with solvent
to remove
old
gasket sealer, dirt, and
grease.
Check the head for
cracks.
Check the
gasket surface
for burrs, nicks,
and
for flatness (fig. 9). Service
specifi-
cations for flatness
are
0.006 inch maximum overall, or
'.
CHECK DIAGONAllY
('i1,
r",n
ACROSS
CENTER
fig.
9-
Cylinder Head Gasket Surface flatnelS
Check-Typical
6601
fig.
J
O-Valve face Runout Check
0.003 inch
in
any
six inches. Make sure all water pas-
sages are
open.
Check the
cylinder
head
core plug for
evidence
of
leakage.
(2) REPAIRS.
Replace the head if
it
is
cracked, or
if
it is damaged
beyond repair.
CAUTION: Do
not
plane
or grind excessive material
from the cylinder
'.ead
gasket surface
as
the
com·
preuion
ratio
i&
altered
when
thi&
operation i.
performed.
Valve
Spring
Tesler
_ _ _ ,(
,
.
fig. "-Valve
Spri"g Pressure Check
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