Valve guides should be replaced when valve stem
clearance exceeds specifications (see 'SPECI-
FICATIONS'). Draw valve guides out and press new
guides in. Refer to Figure
8-7
for
clearance
specifications and proper assembly.
5.
After replacing valves and valve guides,
lap
valves in place until
a
uniform ring shows around
the face
of
the valve. Clean valves, and wash
block thoroughly with a hot solution of soap and
water. Wipe cylinder walls with clean lint-free
rags
and light engine oil.
VALVE
and
VALVE
GUIDE
CLEARANCE
A-VALVE FACE ANGLE
B-SEAT ANGLE
C-GUIDE INSIDE DIA.
WO1-115 and
WO1-150
wo1-210
VALVE
STEM
O.D.
INTAKE
WO1-115,
WO1-150
wo1-210
WO1-115,
WOl-150
wo1-210
EXHAUST
'
CLEARANCE BETWEEN VALVE
STEM AND VALVE GUIDE
WO1-115, WO1-150
INTAKE
wo1-210
EXHAUST
'
WO1-115, WO1-150
wo1-210
Figure
8-7.
Check Tappet Clearance
Figure
8-8
NOTE: Tappet clearance must be measured with
engine cold.
1.
Measure clearance with tappet in its lowest
position.
If
clearance is less than specification (see
'SPECIFICATIONS') grind valve stem end a little
at a time and remeasure. Stems must be ground
square and flat.
Replace valve
if
clearance is too large.
2.
During reassembly check operation of valves
by
turning
.
crankshaft. Remeasure tappet
clearance.
SPRING RETAINER
VALVE SPRING
4
so
._
45"
0.21
67
-
0.21
74
in.
(5.50
-
5.518 mrn)
0.260
-
0.2607 in. (6.60
-
6.61 8 mm)
0.21
54
-
0.21
59
in. (5.468
-
5.48 mm)
0.2585
-
0.2591 in. (6.56
-
6.575 mm)
0.21 38
-
0.21
45
in. (5.426
-
5.444 mm)
0.257
-
0.2578 in. (6.522
-
6.544 mrn)
0.0008
-
0.0020 in. (0.020
-
0.050
mrn)
0.001
0
-
0.0024
in. (0.025
-
0.062
rnrn)
0.0022
-
0.0036
in. (0.056
-
0.092
rnm)
0.0022
-
0.0040
in. (0.056
-
0.1
00
rnrn)
Figure
8-8.
8-4
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