Valve Spring; Camshaft - Yamaha SZR 660 Service Manual

INSPECTION
AND
REPAIR
Apply Prussian
blue
(Dykem)
to
the valve sea!
surface.
Install
the valve
in
the cylinder head-
Press
the valve
onto
the seat
through
the
guide
to leave a clear outline.
Measure
the valve seat width once more.
If
the
width of the valve
is
out of specification alter
and
relap.
VALVE SPRING
1.
Measure:
Free width
of
valve spring
(a;
Out
of specification -» Replace.
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]
Free width
(a)
of valve spring:
Intake
Exhaust
32.63
mm
36.4S
mm
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2.
Measure:
•
Spring load
Out
of
specification -» Replace.
(b)
Length
of
loaded spring
^
Valve spring load:
Intake:
(C)10.2~11.8kg
(b)
27.50
mm
Exhaust:
(c)
12.3
-14.1 kg
(b)
31 .00
mm
3.
Measure:
•
Inclination of spring
(a;
Out
of specification -»
Replace.
£
Inclination of
spring:
Intake
Exhaust
Lower than
1.4
mm
Lower
than
1.6
mm
INSPECTION
AND
REPAIR
ENG
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CAMSHAFT
1. Inspect:
•
Cam
eccentrics
Pitting/Scratches/Blue colour
camshaft.
Replace
2.
Measure:
Cam
eccentrics
Out
of specification ->
Replace camshaft.
«
(a)
(b)
Intake: 35.69-35.79
mm
30.06-30.1
6
mm
Exhaust:
36.50-36.60
mm
30.11-30.21
mm
3.
Measure:
• Runout (camshaft)
Out
ot
specification
-» Replace.
Runout
(camshaft):
Less than 0.03
mm
4.
Measure:
•
Camshaft-to-cap clearance
Out of specification
-» Measure bearing
diameter (camshaft),
^
CamshafMo-cap
clearance:
0.020-0.054
mm
Measurement
steps:
•
Install
the
camshaft onto
the cylinder
head.
• Positione
a strip of
Plastigauge^ onto the
camshaft.
•
Install the
dowel pins and cylinder
head
cover.
Bolt (cylinder head cover):
10Nm(1.0kgm)
4-33
4-34