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I
3
Measuring the wear of
the valve stem
and valve
guide.
Place a dial gauge aga inst the
valve
s1em and
move the
valve sideways. and
fore and afl
The
amount
of
wear
1n
any d1recuon
will
be indicated on the
gauge
(Fig
.
19
).
ltom
Standard Value
I
Serviceable Limit
0 0004-0 0012
Replace
I
over
(0
01-0
03
mm)
0
0032
(0
08
mm)
Exll-
a u _s_l
_.;.....
0012-0 002
I
Repla~e II over
(0.03-0.05
mm)
0 004 (0
10
mm)
©
Small dial gaug.-.
\'2;
Valvo
4
Measuring the
valve
dimension
The
valve
stem
diameter
is measured
with a
micrometer
(Fig.
20)
5. Replacing
the
valve guide
If the valve guide 1s worn excessively
and requires replacement
follows
the
procedure
below
a
Remove
the
valve
guide from the
cvl1nder head using the valve guide
re-
rnover
(Tool
No 07942-32901001
b
Install the new valve guide using the
valve guide driver
(Tool
No
079'12-
3 2 90 200)
and
carefully dnve
the
guide
1mo
the head
The
replacement
valve guide should be one that
is of
an
oversize
c
After
the
new valve guide has been
mstalled. it must
t:>e
reamed to the
proper
fm1sh
size us1og a
guide
reamer
(Tool
No 07984-0980000)
Excercise
care wt,en usmg the
reamer
and apply small amount of
011
ceca·
s1onally
to lubricate
when
the
reamer
starts to operated hard. pull out
the
reamer and remove the
metal chip
before
continuing to ream
The
standard valve guide
diameter
1s
0
.216
6
-
0
.215
9 (5 475
-
6 .485
mm}.
Measurement
can
be rnade with a
cylinder
gauge
(Fig. 22).
Fig
.
19
(&
M1r.rome1e1
~
va1v-,
Fig.
20
OJ
/alve gu1d., emO\'Or
Fig 2
1
<D
Val11e
guide 1eamer
Ag.
22
13
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