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Section
4-
lntake and Exhaust Manifolds
15
4
. INTAK
E AN
D EXHAUST MANIFOLDS
a. Cleaning and Inspection.
Wash grease, oil, and dirt from
t
he
outside
of
t he
manifold.
Clea
n the
ma
ting
surfaces a nd
check
the
m for
damage.
R
epair or replace th
e ma
nifolds
as necessary.
On
the intake
manifolds, check the fuel-air
passages
and the h eat
riser passages for foreign m aterial. Inspect
the
surfaces
for
cracks
or
othe
r
visible
d
efects.
R
e
pair
or
replace the
manifolds
as
n
ecessa
ry.
CAUTION:
Remove
all filings
and for eign
matte
r
that
Inay
have
entered
th
e
Inunifolcls as a result oj
re
pair work.
,
,
,
CLOSED
(HEAT
O
N
)
" ' : ' - -
OPEN
(H
EA
T
O
FF
)
Fig. 6-Exhaust
Control Valve-ECW-
Y 272
Cubic
Inch
Engine
6
3
37
Fig
.
7-Exhaust
Control
Valve-6-Cylinder
Engine
b. Exhaust Gas
Con
trol
Valve-
223
and
ECW-Y 272 Cubic Inch
Engines.
Check
the va lve spring to
make
sure it is
hooked
on
the
stop
pin.
The
spring stop is at the top of
the
va lve
housing when
the
va lve
is
properly installed.
T
he
action of the valve
is illustrated
in figs. 6 and
7.
Check
to make
su
re
the
spring
holds
th
e va lve
closed
when
the
engin
e
is
cold.
Actu
ate
the
counterweight by
hand to
make
sure
it moves
freely
through approx-
imately
90°
of
rotation with out
binding.
The
v
alve is closed when
the engi ne
is
a
t normal
opera
ting temperature and running at
idle
speed.
How-
ever, a properly
operating
valve will
open when
very
light
finger pressure is applied
to the counterweight.
Rapidly accelerate
the
engi ne to
make sure the
valve
momentarily
opens.
The
valve
is designed to open when
the
e
ngine is at
normal
operating
temperature
and
is
operated at high
r.p.m
.
Free
stuck valves with a
pene-
trating
oil, or kerosene and graphite
mixture.
5. ROCKER
MECHANISM, CYLINDER
HEADS,
VAL
YES, VALVE LASH
ADJUSTMENT,
AND VALVE TIMING
The
section
covers the inspection
a
nd repair
proce-
d ures a pplicable
to the rocker
m
echanism,
cylinde
r
head,
a
nd
valves.
In
addition,
the
methods
used
to
adjust
the
valve lash a
nd
to
check
valve
timing
a re
given.
a.
Rocker
Mechanism
.
The
rocker mechanism parts
are
individua
lly
re-
p
laceable.
( 1) CLEANING
AND
INSPECTION. Check
the 1.0.
of the
rocker
arm
bore
and
the
O. D
.
of the rocker
arm
shaft, at the
location
of
the
rocker
arms.
Inspect the
rocker arms
for
grooved p
ads.
Check the
rocker adjust-
ing
screws a
nd lock
nuts
for
stripped or
broken
threads,
and
the
ball
end
of the
screw for nicks, scratches,
or
excessive wear.
Inspect the
locating
sprin
gs for
cracks or
other
signs
of
failure.
Inspect the oil
drain tube
for.
cracks or
sharp
bends.
Check
the
ball
a
nd sock et
ends of
the push
rods
for
nicks,
grooves, roughness,
or
excessive wear.
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