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MA INTENANCE AND
ADJUSTMENT
G)
~
~
~
1
~V
8
1
"'e
A-Sinkage
Z-Cy
lin
do'r h'llad
Valve
si nkage
(3)
Val.e
guide
replacement
Unit: mm (in.)
Item
Stan
dard
Service
limit
0.055
~
0.085
O
.IS
Intake
(0.00 22
-
Valve
stem
0.0033)
(0.0059)
ck
arancl!
in
valve
guide
0 .070-0
.100
0
.20
Exhaust
(0.0028 -
0.0039)
(0
.0079)
Guide length outside
l7± 0.3
hole
52
(0.669
±
O.Q12)
Where the
sttrn-t
o·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 this
clearan
ce,
check
each
guide
10
se.
if its
!.D.
nea
r
each
end
has
enlarge
d
and,
if
so,
replace
it
.
Vah'e
guidl!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 lve
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
replacement
A
The valve stem seals should b. replaced
Jf
the
engine disassembled
shows
evidence
of
lube oil
leaking
Jnto the combustion
chambers
along valve
siems.
Tho
seaJ
can be read
ily
removed
.
When
putting on a new seal, make
sure
thal it
fits snugly
into the annular groove provided in the vaJve guide:
end.
if
a
valve has
to
be drBwn
Oul
for one reason or
another
in
the
engine
in
regular
use. be sure
to
have •
replacement
stem
seal on
hand
for
that
valve
.
1lUs is because the seal
lip is ce rlain
to get
scmed
by
the
sharp-edged
stem
end.
,
2
3
.
J
'.
l..$tem sael
2-Guidc
3
-Cy
li
nder
~ead
VCllve stem seal
replace
ment
(S) Va!>e seat refacing
A valve. seal
badly
wOrn or coarsened must
be
"
faced
by
grind
ing
in
place.
Us
• •
yalv. seat
grinder
Or
a
seat
CUlter
and 400-gril
emery
cloth
.
Care
mus.t be exercised in
using
the seat cutter so
that the
cut
will
be even all.round.
Aft
er
culling,
pinch the 400.grit emery clolll
between
the cutter
and Ihe
seat
and grind the seat face smooth.
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