90
(Fig
ur
e 8S). They should not
be
scored
or
excessively worn. Replace the cylinder head and
camsha
ft
bearing caps
if
the bearing surfaces are
worn or sco
red
.
7.
In
spect
Ihc
camshaft sprocket teeth (A. Fig
ur
e
86)
for
wear: replace
if
necessar
y.
8.
Make sure the camshaft sprocket bolt hol
es
(
8.
Fi
gure
86) arc not elongated
or
damaged.
If
dam-
aged. replace Ihc camshaft spr
oc
ket.
Camsha
l't
Bearing
Clearance Meas
ur
ement
Thi
s
pr
oce
dur
e requires the u
sc
of
a Plastigage
SC
I.
The
ca
mshaft
mu
st
be
in
stalled into the
cy
lin-
der head. Befo
re
installing
th
e camshaft. wipe all
oil residue from thc camshaft bearing journals and
bearing surfaces
in
the cylin
der
head and
cy
linder
head cover.
I.
In
stall the camshaft into
Ih
e cylinder head with
the lobes facing down. Do
nOi
allach the drive
sprocket
to th
e camshaft.
2.
In
stall the
"C"
ring into the groove
in
the
camshaft and
cy
linder head.
3.
Mak
e sure the locating dowels
(F
igur
e 87) are
in place
in
the
cy
linder head.
4.
Place a strip of Plastigage material on top
of
each camshaft bearing journal. parallel to the
camshaft.
5.
Install the
cy
linder head cover and bolts.
6.
Refer to Figure 71 for
cy
linder head cover bolt
length placement.
Be
sure to place a sealing washer
und
er all bolt heads followed
by
an
asterisk (*) in
Fig
ur
e 7
1.
Ins
ta
ll
the bolts securing the
cy
linder
head cover. The only black
bolt (length
130
mm
)
is
installed at
th
e right-hand re
ar
corner.
7.
Tighten the bolls
in
a crisscross pallem, slaning
with the center bolts (surrounding the camshaft)
and working outward. Tighten
in
2-3 stages
to
the
torque specificat ion
li
sted
in
Ta
bl
e 2.
CAIff
/ON
Do not rotale the camshaft with the
Plllstiglige
material in place.
8.
Loosen the cylinder head bolts
in
2
-3
stages
in
a crisscross pallern. then rem
ove
the bolts and
scaling
wa
sher
s.
":
9. Carefu
ll
y rem
ov
e the
cy
linder head cover.
CHAPTER FOUR
10
. Measure the width
of
the natlened Plastigage
mater
ial
at the widest point. according to the man-
ufacturer's instruction
s.
CAIffION
Be
sure 10 remo\'t! all traces
of
Plastigage material from the bearing
journal grool
'es
in the cylinder head
C
OI'
e
r.
If
any material is left
in
the
engine
il
can plug up an oil control or-
ifice
and cause severe engine damage.
®
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