Replace valves if
the
valve
face
is
pitted
or
warped.
Correct
the
valve
seat
by
using
4S0
seat
cutter
tool
as
illustrated in Fig.
6-3-3.
The finished
seat
width should
be
1.2
~1.5
mrn.
Valve guides should
be
replaced when
valve stem clearance becomes excessive.
(See
Fig.
6-34)
Draw valve guides out using -valve guide
puller
tool
as
shown
in
Fig.
6-3-4
and
press new guides in, using the same puller
tool.
Assemble valve springs and spring
re-
tainers
after
adjusting tappet
clearance.
t3"
1
Guide
(
):
EY14
A
-
VALVE FACE ANGLE
B
-
SEAT ANGLE
/
C
-
GUIDE INSIDE DIA.
INTAKE
D
-
VALVE
STEM
DIA.
EXHAUST
MAXIMUM ALLOWABLE
CLEARANCE BETWEEN Cand
D
I
EXHAUST
i
INTAKE
Valve Seat Cutter
Fig.
6-3-3
Fig.
6-3-4
EY14 EY18-3, E23, EY25-2, EY27-2
45O
I
4
5O
45"
I
45O
6
dia.
+0.015
0
7
dia.
N.036
N.016
6
dia.
i
-0.025
-0.040
-0.040
-0.062
.7
dia.
-0.075
-0.095
6
dia.
0.025L-
0.055L
0.075L-
0.1
1OL
0.056L- 0.098L
VALVE
and
VALVE GUIDE CLEARANCE
Fig.
6-3-5
L:
Loose
-
24
-
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