l·
Handle
4-B
ushin
2-
Spacer
ph
Hes 5-Cra
nkca
se
3-Pilo,
pl.u
e
6-0n
...
!!'
plait!
Us
e
of
bushing
dr
iver
Cyl
inder
he
ad
Cylinder head insptction
Check the gnsketed surface
of
the
cy
lin
de
r head for
flatness
by
using a str
ai
ghtedge and thickness g.uge
as
in the c
ase
of
ch
ec
king t
he
CTankc:as~
surfaces. This
check
is
to
be made
wi
th
the
precombustion j
tt!>
removed.
Use a slIrf3ce grinder
to
reface the cylinder
head
, as
l'leC
e
ss
ary) to the speci
fi
ed flatness.
Checking cYlinder head lace
for
fl
atness
Un
i
t:
mm (in.)
Item
Standard
Repa
ir
limit
Flatness
of
g
3sk
eted
0.
05
(0.002),
0.2
surface
of
cylinder
m
ax.
(0.00
8)
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
w
ithin
the service limit, grind
smo
oth t
he
seating face
of
each valvc
j
rcmo\oing the wear
grooye,
if
any
, a_nd "rtnishing
it
to
the
spe
ci
fi
ed
aI'lgJe
of
45
deg. F
or
this
se
rvice, use a valve
refacer.
Un
it:
mm (in.)
Item
Standard
Service
limit
8
-0
.0
45
Intake
-0.
060 - 0.1
(03
15
-0·00177)
(- 0.004)
Valve
ste
m
. - 0.00236
diameter
8
-0.
060
Ex/laust
-0.
075
-0
.15
(0.315
-0
.00236) (--
0.
0059)
- 0.00295
I
~(
0 .0472
Va
lve
b.,d
thickness
1.5
(0
.
059)
aner
refacing
--
- -
--
-
1.5
-r
,
'--!..
s·
Valve head
th
ickne~
(2)
Valv
e replacemen'
(a) Replace valves
wh
ose stems. are found to ha\'e
worn
down
to
the service limit or
head
thick.-
n
ess
is
down to 1.2
mm
(004
72 in.) or under
aft
er
re
f
iJc
i
ng
_
(b) Any v
alve
showing evidence of c
ra
cking parti-
cularly
in
the head
part
must be replaced.
(c) "V
al
ve
sink,ge" refers to a bead f.ee
be
i
ng
below the combustion chambf!:r surface,
illS
show
n,
a
nd
is
prescr
ib
ed
to
be
not greater than
I.3
mrn
(0.051 in.), the standard
'i
nkage
beinS
0.7 ! 0.2 nun (0.028 ± 0.008 in.).
If
th'wni
t
is.
reached, replace the valve
Or
seat.
(d) Replace vah'e caps found excessively worn
01
1
the t
op
face
.
51
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