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1-20
GROUP 1- ENGINES AND EXHAUST SYSTEM
CYLINDER FRONT COVER
AND TIMING CHAIN
REMOVAL
1. Drain the
cooling
system
and
the crankcase. Disconnect the radi-
ator
upper hose
at
the
coolant
outlet
elbow and
the radiator lower hose
at
the water
pump.
2. Remove the radiator. Remove
the
drive
belt, fan
and pulley, and
the
crankshaft
pulley.
If equipped
with
a crankshaft
vibration
damper, re-
move the
damper using
tool T58P-
6316-A.
3. Remove the
cylinder
front cover
and gasket (the
crankcase
ventilation
tube bracket is retained
by
onc
cylin-
der front cover
bolt).
Remove the
crankshaft front oil
slinger.
4.
Establish a
reference point on
the
block and
measure
from
this
point to the
chain.
Rotate
the crank-
shaft in the
opposite
direction to take
up the
slack on
the right
side
of
the
chain.
Force the left side
of
the
chain
out
with
the
fingers
and measure the
distance between the
reference point
and
the chain. The
deflection
is the
difference between the two measure-
ments.
If
the deflection
exceeds
112
inch,
replace
the timing
chain and
sprockets.
5.
Crank
the
engine
until the tim-
ing
marks
are aligned as shown in
Fig.
45.
Remove
the
camshaft
sprocket
retaining
bolt and washer.
Slide both
sprockets
and
timing chain
forward and remove them
as
an
as-
sembly (Fig.
46).
6. Remove the
oil
pan
and
related
parts.
INSTALLATION
1.
Position
the
sprockets and
tim-
ing chain on
the
camshaft and crank-
shaft.
Be
sure
the timing marks
on
the
sprockets and
chain
are
positioned
as
show
n
in Fig. 45.
Install the
cam-
shaft
sprocket retaining
bolt
and
washer. Torque the bolt
to specifica-
tions.
Install the
oil
slinger
so
th at
the timing pointer
on
the
slinger is
TIMING
MARKS
A
1370-
B
FIG.
45-Aligning Timing Marks
FIG.
46-Timing Chain and
Sprockets Removal
aligned
with
the
camshaft sprocket
timin
g
mark.
2.
Clean
the
cylinder front
cover
and
the
gasket surface
of the
cylinder
block. Apply
sealer
to
a
new
cylinder
front
cover gasket and position
the
gasket on
the
cylinder
front
cover.
Install th
e
cylinder front cover
using
the
tool shown
in
Fig.
47
(the
crarik-
case
ventilation
tube
bracket
is re-
tained by
one
cylinder front
cover
bolt).
Torque
the retaining
bolts
to
specifications.
3.
Install
the crankshaft
pulley.
If
equipped with a crankshaft vibration
damper,
install the
damper
using tool
T52L-6306-AEE.
Torque the
retain-
ing bolt to
specifications.
4.
Install the
oil pan
and related
parts.
5.
Install
the
fan,
pulley,
and
drive
belt.
Adjust
the drive
belt.
6.
Install the
radiator.
Co
nnect the
radiator upper
and
lower
hoses.
7.
Fill and bleed
the
cooling sys-
tem.
Fill
the
crankcase with
the
proper
quantity and grade of engine
oil.
8.
Start
the
engine
and
check the
ignition
timing.
Adjust
th
e
ignition
timing
if
necessary. Operate the en-
gine at
fast
idle
and check aU
hose
connections and gaskets for
leaks.
CLEANING AND INSPECTION
Clean
all
parts in
solvent and
dry
FIG_
47-Cylinder Front Coyer
Alignment-Typical
FIG_
4B-Crankshaft Front Oil
Seal Replacement-Typical
them
with compressed
air. Inspect
the chain for
broken
links
and
the
sprockets for
cracks, and worn
or
damaged teeth. Replace
all
com-
ponents
of
the timing
chain
and
sprocket
assembly
if
anyone
item
needs
replacement.
FRONT
OIL SEAL REPLACEMENT
1. Drive out the
old
seal
with
a pin
punch.
Clean out
the
recess
in the
cover.
2.
Coat a
new seal
with grease
and
install
the
seal
(Fig. 48).
Drive the
seal
in until
it
is
fully
seated in the
recess.
Check
the
seal
after
installa-
tion to be
sure
the spring is properly
positioned in the
seal.
CAMSHAFT
The camshaft and
related parts are
shown in Fig.
49.
REMOVAL
1. Drain the
cooling system and
the
crankcase.
Remove the
air
clean-
er and gasket.
Disconnect the battery
cable at
the
cylinder
head.
2. Disconnect the radiator hoses at
the
coolant outlet elbow and
the
water
pump.
Remove
the
radiator. Remove
the
grille.
3. Disconnect the
accelerator
rod
retracting
spring.
Disconnect the
choke control cable and
the
acceler-
ator
rod
at
the
carburetor.
4. Disconnect the fuel inlet line
and
the distributor vacuum
line
at the
carburetor.
Disconnect the vacuum
line
at
the
carburetor spacer or
in-
take
manifold.
S. Disconnect the
carburetor spac-
er
outlet
line
at the carburetor
spacer.
Disconnect the heater
hose
at
the
water pump and
at
the
cylinder
head.
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