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8-46
to
specifications.
2.
Lower the engine into position,
install the engine insulator assembly to
insulator support bracket through bolt and
remove the jack and wood block.
3.
Install
the
engine
insulator
assembly to insulator support bracket
nuts.
Tighten the nut to specifications.
4.
Install the fan shroud attaching
bolts.
ENGINE REAR SUPPORT
The rear support is located at the
transmission extension housing
(Fig.
3).
REMOVAL
1.
Remove the support insulator to
crossmember attaching nuts.
2.
Remove the support insulator to
transmission extension housing bolts and
lock
washers.
3.
Raise the transmission with a
floor
jack.
Remove the support insulator
and retainer.
INSTALLATION.
I.
Position the support insulator and
retainer on the transmission extension
housing.
2.
Install the support insulator to
transmission extension housing bolts and
lock
washers.
Tighten
the
bolts to
specifications. Lower the transmission.
3.
Install the support insulator to
crossmember attaching nuts. Tighten the
nuts to specifications.
VALVE CLEARANCE CHECKING
PROCEDURE
The valve arrangement of the left
bank is E-I-E-I-E-I-E-I and on the right
bank is I-E-I-E-I-E-I-E.
A 0.060-inch shorter push rod or a
0.060-inch longer push rod are available
for
service to
provide a means of
compensating for dimensional changes in
the valve mechanism.
W ith
No
, I ot TDC at end
o
f compr
e
ss ion st roke
mak
e
a chalk mark at
poi
nt
s
Band C approx imatel
y
90 degree
s
aport
.
GROUP 8-
ENGINE
FIG. 4 - Checking Valve Clearance
Valve stem to valve rocker arm
clearance should be within specifications
with
the hydraulic
lifter completely
collapsed.
Repeated valve reconditioning
operations
(valve
and/or
valve
seat
refacing) will decrease the clearance to the
point that if not compensated for
,
the
hydraulic valve lifter will cease to function
and the valve will
be
held
open.
To determine whether a shorter or a
longer push rod is necessary
,
make the
following check:
1.
Disconnect the brown lead
(I
terminal) and the red and blue lead (S
terminal) at the starter relay. Install an
auxiliary
starter switch between the
battery and S terminals of the Starter
relay.
Crank the engine with the ignition
switch OFF until the No. I piston
i~
on
TDC after the compression stroke.
2.
With
the
crankshaft
in
the
positions designated in
Steps,
3,4, and 5,
position the hydraulic lifter compressor
tool on the rocker
arm.
Slowly apply
pressure to bleed down the hydraulic lifter
until the plunger is completely bottomed
(Fig.
4)
.
Hold the lifter in this position
and check the available clearance between
the rocker arm and the valve stem tip with
a feeler
gauge.
FIG. 5- Position of Crankshaft for Checking Valve Clearance and Installing Rocker Arms
If
the
clearance
is
less
than
specifications,
install an undersize push
rod. If the clearance
is
greater than
specifications, install an oversize push
rod.
3. With the No. I piston on TDC at
the end of the compression stroke,
POSITION
A in
Fig.
5, check the
following
valves:
No.
1 Intake
No.
I Exhaust
No.
4 Intake No. 3 Exhaust
No. 8 Intake
No.
7 Exhaust
4.
After
these valves have been
checked,
rotate
the
crankshaft
to
POSITION B in Fig.
5,
and check the
following
valves:
No.
3 Intake
No.
2 Exhaust
No. 7 Intake No. 6 Exhaust
5.
After
these
valves have been
checked,
rotate
the
crankshaft
to
POSITION C in
Fig.
7 and check the
following
valves:
No.
2 Intake
No.
4 Exhaust
No.
5 Intake
No.
5 Exhaust
No.
6 Intake No. 8 Exhaust
VALVE ROCKER ARM COVER
AND ROCKER ARM
6.
The valve rocker arm
is
shown in Fig.
ROCKER
ARM
6564
FULC
RUM
SEA
T
6A528
FIG. 6- Rocker Arm and Related Parts
POSITION A -
No.
1 a
t TDC
a
t e
nd
o!
com
pression stroke.
POSITION 8 -R otate the cra nk
sha
ft
180
deg
re
es
(one
ha lf
re
vo lution) clock wise
fr om POSITION
A.
POSITION C -R otate
the
cranksha
ft 270
degr
e
es
(three
q uar ter
revolution)
clockwis
e fr om
POSI
TI
O
N
B.
A3234.A
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