MA
INTENANCE
AND
ADJUSTMENT
G)
~
~
~
1 ~
V
8
1
"'
e
A
-S
inkage
Z-C
y
lin
do'
r
h'll
ad
Val
ve
si
nk
ag
e
(3) Val.e guide replacem
ent
Unit:
mm (in.)
Item
Standard
Service
limit
0.
055
~
0.085
O.IS
Intake
(0.0022 -
Valve
stem
0.0033)
(0.0059)
ck
arancl!
in
va
l
ve
guide
0.
070-0
.100
0.20
Exhaust
(0.0028 -
0.0039)
(0.0079)
Guide length outsi
de
l7±
0.3
ho
le
52
(0.669 ±
O.Q12)
Where the st
trn-
to·guide clo3um:e
is
found to have
excee
de
d the
s.e
rvice
Urn
;
t,
both
valve
and
guide
must
be
replaced.
Apart
from t
his
clearan
ce,
check
each
guid
e 10
se.
if its !.D. near each
end
has
enlarged and, if so, replace it.
Vah'e
gu
id
l!s
are press-fitted. To
remOve
them,
use
a
pre"
and
a drift, which
i,
a special tooJ called
the
gUide
remover (3 1391.10500); to install,
use
the installer
(34491-00400).
another special.tool
drift.
•
1
o
~
3
~
·
E
. . '
..
".
-.
~
.
.'
\:
-'
:-
,·Remolle.r
2-
GlJidl!! l -Cy I in
Cler
hca.::l
Removing
va
l
ve
guide
lj-
UI
!...:.!......:.
3)-
1.
•
;:
:c
··
>
··
.;:.:
-'
:.
",
l·lnstalier
3-Gylinder
head
2·Guide
A·Guide
length
outside
hole
Installing
val
ve
guide
(4)
Va1ve
stem seal repla
cement
A
T
he
valve
stem seals should
b.
repl
aced
Jf
the
engine
disassembled shows evidence of l
ube
oil
leaking Jnto the
combu
stion chambers along valve
siems. Tho
seaJ
can
be readily removed. When
putting
on
a new seal, make s
ure
thal
it
fits snugly
into the annular groove provided
in
the
vaJve
guide:
end.
if
a valve has to be d
rBwn
Oul
for one reason
or
another in the engine
in
regular use.
be
sure
to
have
• replacem
ent
stem
seal
on
hand for
that
valve
.
1lUs
is
because the seal lip
is
ce
rlain to get
scm
ed by the sharp-edged stem end.
,
2
3
.J
'.
l..$tem sael 2-G
uid
c 3-Cylin
der
~ead
VCll
ve stem seal repla
ce
ment
(S) Va!>e seat
re
facing
A v
al
ve.
seal badly
wOrn
or coarsened must
be
" faced by grinding
in
place.
Us
••
yalv. seat
grinder Or a
se
at
CU
lter
and
40
0-gril emery clo
th
.
Care
mus.t
be
exercised in using the
se
at cutt
er
so
that
the
cut
will
be
even
all.round.
After
cu
lling,
pinch the
40
0.grit
emery
cl
olll between the
cutter
and Ihe seat and grind
the
seat face smooth.
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