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CYLINDER HEADIVALVE/CAMSHAFT
Inspect and
reface
the
valve seats
wflenEMIf the valve
guides
BfB
replaced
(page
8-14)
Subtract each valve stem
0.0.
from the
correspond·
ing guide
1.0.
to obtain the stem-ta-guide clearance.
SERVICE
LIMITS: IN:
0.12
mm (0.005
in
)
EX:
0.14
mm
(0.006
in)
If
the
stem-ta-guide clearance
exceeds the
sarvice
limit, determine
if
a
new guide
with standard
dimensions would
bring
the clearance within
toler-
anea.
If
so,
replace
any guides as
necessary
and
ream
to
fit.
If
the stem-ta-guide
clearance
exceeds the service
limit
with a
new
guide. also replace the valve.
VALVE GUIDE REPLACEMENT
8e
sure
to
wear
heavy
gloves to
aVOId burns when
handlmg
the
heated
cyllflder head.
USing
a
torch
to
heat the cylmder
head
may cause
wo"",ge
Take care not
co
tilt
or lean the reamer
In
tile guide while
r8amlflf}
8-12
Chill new valve guides
in the freezer section
of a
refrigerator
for about an
hour.
Heat
the
cylinder
head
10
130-140°C
(275-290
G
F)
with a
hot
plate or oven.
Do not heat
the
cyl
inder
head
beyond
150°C (300°F),
Use
temperature
indica-
tor
sticks, available
from
welding supply stores, to
be sure the cylinder
head
is heated
to the
proper
temperature.
Support the cylinder
head
and
drive the
valve
guides out of
the
cylinder
head
from the combus-
tion
chamber
side.
TOOL:
Valve g
uid
e
d
river,
5.5
mm
07742-0010100
While the cylinder
head is
still
heated.
drive
new
valve guides in the cylinder head from the
rocker
arm
side using
the same tool
until
the exposed
height is specified
val
ue.
VALVE GUIDE
PROJECTION:
IN:
15.8
-
16.2
mm
(0.62 -
0.64
in
)
EX:
18.8
-
19.2
mm
(0.74
-
0.76
in
)
let
the cylinder
head
cool
to room temperatu re.
Ream
the
new valve guides.
Insert the
reamer
from
the
combustion chamber
side of
the
head and always rotate
the
reamer clock-
wise.
TOOL:
Va lve
gu id
e reame
r,
5.5
mm 07984-2000001
or
07984-2000000
(U.S.A.
only)
Use
cutting oil on the reamer during
this
operation.
Clean the cylinder head thoroughly
to remove
any
metal particles after
reaming
and
reface the
valve
seat (page 8-14).
DRIVER
(
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