• Remove the
oil
seal with long-nose pliers.
• Remove the valve spring seat.
NOTE:
Removal
of
valves completes ordinary disassembling work.
If
valve guides have
to
be
removed for replacement after inspect-
ing the related
parts
,
carry
out
the steps shown in the valve guide
servicing.
CYLINDER HEAD DISTORTION
Decarbonize the combustion chamber.
Check the gasket surface of the cylinder head for distortion
us
-
ing
a straightedge and thickness gauge.
Take
clearance read-
ing
s
at
several places.
If
any clearance reading exceeds the ser-
vice limit, replace the cylinder head with a new one.
S 09900-20803:
Thickness
gauge
_
Cylinder
head
distortion
S"rv;';"
Lirnil
:
0.05
.11111
(0.002
ill)
VALVE STEM RUNOUT
Support the valve using
V-blocKs
and measure the valve stem
runout using the
dial gauge,
as
shown.
If
the runout exceeds the
service
limit, replace the valve with a new one.
S 09900-20606: Dial
gauge
(1/100
mm)
09900-20701:
Magnetic
stand
09900-21304: V-block set (100
mm)
~
Valve stem
runout
S
..
rvic
..
Limit:
0.
05
mm
(0.002
in)
ENGINE 3-23
o o
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