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l·Handle
4-Bushin
2-Space
r
phHes
5-Crankcase
3-Pilo, pl.u
e
6-0n
...
!!'
plait!
Use
of bushing
driver
Cylinder
head
Cylinder head insptction
Check the gnsketed surface of the cylinde
r
head for
flatness
by using a straightedge and thickness
g.uge
as
in
the case of checking the
CTankc:as~
surfaces. This
check
is
to
be
made
wi
th the pre combustion jtt!>
removed.
Use
a slIrf3ce
grinder to reface the cylinder head
,
as
l'leCessary
)
to
the speci fied
flatness.
Che
cking
cYlinder
head
lace
for
fl
atness
Un it:
mm
(in.)
Item
Standard
Repair
limit
Flatness
of
g3sketed
0.05
(0.002),
0.2
surface
of
cylinder
max.
(0.008)
head
MAINTENANCE
AND ADJUSTMENT
Valves and valve seat
(l)
Inspection
De-carbon valve stems and seats;
inspect
both for
wear and
evidence
of bumjng. Provided
that
the
wear is within
the service
limit
,
grind
smoo
t
h
t
he
sea
ting face
of each valvc
j
rcmo\oing
the
wear
grooye, if any
,
a_
nd "rtnishing it
to
the
speci
fied
aI'lgJe of
45
deg
.
F
or this
se
rvice, use
a valve
refacer.
Unit:
mm (in.)
Item
Standard
Service
limit
8
-0.045
Intake
-0.060
-
0
.1
(03 15-0·00177) (-
0
.004)
Valve
stem
.
-
0.00236
diameter
8
-0.060
Ex/laust
-0.075
-0.15
(0.315
-0
.00236)
(--
0.0059)
-
0.00295
I
~(0
.0472
Valve
b.,d thickness
1.5 (0.059)
aner
refacing
- -
-
-
- -
-
1.5
-r
,
' - -!..
s
·
Valve head
th
ickne~
(2)
Valve replacemen'
(a)
Replace valves
whose stems.
are found
to
ha\'e
worn
down
to the service limit
or
head
thick.-
ness
is
down
to 1.2 mm
(00472
in.) or under
after
re
fiJcing_
(b) Any valve
showing evidence
of
cracking
parti-
cul
arly in the head part mu
st
be repla
ced.
(c) "Valve sink,ge" refers
to
a bead f.ee being
below
the combustion chambf!:r
surface,
illS
shown,
and is prescribed
to
be
not
greater than
I.3
mrn
(0.051
in.),
the standard
'inkage
beinS
0.7
!
0.2
nun (0.028
±
0.008
in.).
If
th'wnit
is. reached
,
replace
the valve
Or
seat
.
(d)
Replace vah'e
caps
fou
nd
excessively
worn
011
the top face
.
51
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