Valve
gu
i
de
rem
over
(
04.
5)
90
890-04116
Valve
gu
i
de
remov
er
(
4.5
mm
)
YM
-04116
Valve
gu
i
de
in
staller (04.5)
90
890-04117
Valv
e
guid
e
in
staller (4.5
mm
)
YM
-
04117
Valve
gu
i
de
reamer (
04.5
)
90
8
90
-04118
Valve
gu
ide rea
mer
(4
.5
mm)
YM-0411 8
••••••••••••••••••••••••••••••••
3. Eliminate:
• Carbon deposits
(from the valve face and
va
l
ve
seat)
4.
Check:
• Valve face
Pitting/wear
4 Grind the valve face.
• Valve stem end
Mushroom shape
or
diameter larger than the
body
of
the valve stem 4 Replace the valve.
5. Measure:
• Va
lv
e stem ru
no
ut
Out of specification
4 Replace the valve.
TIP
~~~~~~~~~~~~~~-
• When installing a new valve, always replace
the
va
l
ve
guide.
• If the valve is removed
or
replaced, always re-
place the valve stem seal.
EA~
XO
V
al
ve stem
runo
ut
0
.01
O
mm
(
0.
00
04
in)
CHECKING THE VALVE SEATS
//
The following procedu
re
applies to all of the
valves and val
ve
seats.
1. Eliminate:
• Carbon deposits
(from the valve face and
va
l
ve
seat)
VALVES AND VALVE SPRINGS
2. Check:
• Val
ve
seat
Pitting/wear
4 Replace the cylinder head.
3. Measure:
• Val
ve
seat width "a"
Ou1
of specificat
io
n 4 Replace the cylinder
head.
Valve seat wi
dth
Va
lv
e se
at
width
(in
ta
ke)
0.
90-
1.10
mm
(0.0354--0.0
433
In)
Li
mit
1.
60
mm
(
0.
06
in)
Va
lve seat width (
ex
hau
st)
1.1
0-
1.30
mm
(0.0433--0.05
12
in)
Limit
1.
80
mm
(0.
07
In)
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Apply blue layout fluid "b" onto the
va
l
ve
face.
b
b.
Insta
ll
the valve into the
cy
li
nder head.
c. Press the valve through the
valve guide and
onto the val
ve
seat
to
make a clear impres-
sion.
d. Measure the valve seat width.
TIP
~~~~~~~~~~~~~~-
Whe
re
the valve seat and
va
l
ve
face contacted
one another, the blue layout fluid will
have been
removed.
AAA..AAAAA£AAA£AAAA£AAA£AA..t...AAAAA£A
4. Lap:
• Val
ve
face
5-25
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