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l
(
Take care
nor
t
D
tilt
Ream the valve
guid
e to
rem
ove any carbon build-
or lean the reamer
up before measuring
the
guid
e 1.0.
in the guide while
Insert the
reamer from
the
combu
stion chamber
reaming.
side of the
head
and always rotate the reamer clock-
wise.
TOOLS:
IN
:
Valve
guide reamer, 5.5
mm 07984-2000001 or
07984·2000000
(U .S.A .only)
EX:
Valve
guide
reamer,
5.0 mm 07984-MA60001or
07984-MASOOOO
(U.S.A.only)
Measure and
record
each valve guide 1.0.
STANDARD:
IN
:
5.552
mm
(0.2186
in)
EX:
5.052
mm
(0.1989
in)
Subtract each valve stem 0.0. from the correspond-
ing guide I.D. to obtain the stem-ta-guide
clearance.
STANDARD:
IN:
0.010
-
0.037 mm
(0.0004
-
0.0015
in)
EX;
0.020
-
0.047 mm
(0.0008
-
0 .0019 in)
Reface
the
valve
If the stem-to-guide clearance exceeds the service
sears whene ver tile
limits, determine if a new guide with standard
valve guides
are
dimensions would bring the clearance within toler-
rep/aced
(page
9-
ance. If so,
replace
the guides as
necessary
and
29).
ream to fit.
If the stem-to-guide clearance exceeds
the
service
limit
s with new guides also, replace the valves and
guides.
VALVE GUIDE REPLACEMENT
Mark new valve
guides
at the proper depth (see
specification page 9-30)
using
a
marker.
Chill the
new valve guides in a freezer
for
about 1 hour.
Using a Toren to
Heat
th
e cylinder head to 100 - 150"C (212 - 300"F)
heat the cylinder
with a
hot
plate or oven. Do
not
heat the cylinder
head may cause
head beyond 160°C
(320"F).
Use temperatu re ind
ica-
warpage.
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.
TOOLS:
IN
:
Valve guide
remover,
5.5
mm 07742·0010100
EX
:
Valve guide remover,
5.0
mm 07942·MA60000
CYLINDER HEADIVALVES
VALVE GUIDE REAMER
VAILVE GUIDE REMOVER
9-29
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Troubleshooting
