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CYLINDER HEAD/VALVES
Ream
the
guides
to
remove any
carbon
deposits before
checking
clearances.
Insert
the
reamer from
the
combustion
chamber
side
of
the
head and always
rotate
the
reamer
clockwise.
TOOL:
Valve guide reamer. 5.485
mm
07984
-
0980000
or
07984
-
0980000
(U.S.A. only)
Measure and
record
each
valve
guide
1.0.
SERVICE
UMIT
IN/EX: 5.50
mm
10.217
in)
Subtract
each
valve
stem
O.D.
from
the
corresponding guide
I.D.
to obtain the
stom-to-guide
clearance.
SERVICE
LIMITS:
IN:
0.08
mm
(0.003
in)
EX:
0.10
mm
(0.004
in)
If
the
stem-togulde
clearance
exceeds
the service
limits,
determine
if
s
new
guide with standard
dimensions would
bring the clearance within
tolerance.
If
so.
replace
any
guides
as necessary
and ream
to
fit.
If
the
stem-to-guide clearance
exceeds
the service
limits
with
new
guides
also,
replace the valves
and
guides.
NOTE
•
Reface
the
valve seats
whenever
the valve
guides
are
replaced (page
7-11).
VALVE GUIDE
REPLACEMENT
Chill
the
replacement
valve guides
in
the freezer section of
a
refrigerator for
about an
hour.
Heat
the cylinder
head
to
100
-
150
C
(212 - 300°F) with
a
hot plate
or oven.
Ji
•
To
avoid burns,
wear heavy
gloves
when
handling
the
heated
cylinder head.
CAUTION
•
Do
not
use
a
torch
to
heat
the cylinder
head;
it
may
cause warping
Support
the cylinder
head and
drive
out
the valve
guides
from
the
combustion
chamber
side of the cylinder
head.
TOOL
Valve guide
driver,
5.5
mm
07742
-
0010100
(1)
VALVE GUIDE
REAMER
7-10
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