Inspection And Repair; Cylinder Head; Valves And Valve Guides - Yamaha SZR 660 Service Manual

INSPECTION
AND
REPAIR
ENG
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1
1
INSPECTION
AND REPAIR
CYLINDER HEAD
1.
Eliminate:
•
Carbon
deposits
(from combustion chamber)
Use
a
rounded
scraper.
NOTE:
Do
not
use a
pointed tool to
avoid damaging
or
scratching;
spark
plug thread
valve seats
combustion chamber
2. inspect:
*
Cylinder
head
Scratches/Damage -> Replace.
Water
jacket
Crust of minerals/Rust -* Eliminate.
3.
Measure:
•
Deformation
Out
of
specification -»
Rework
the surface.
5
Cylinder
head deformation:
Less than 0.03
mm
4.
Surface:
•
Cylinder
head
Levelling:
Level the cylinder head with wet
400
~
600
emery
paper
in
a
figure-8 direction.
NOTE:
To
avoid removing
too
much
material
on one
side
only, turn the cylinder
head a number
of times.
INSPECTION
AND
REPAIR
ENG %m
VALVES AND VALVE GUIDES
1.
Measure:
•
Clearance
between stem and guide
Internal diameter
of
valve guide
(a)
-
Diameter
of valve
stem
(b)
Out
of specification
guide.
Replace
valve
^
Clearance
between stem and
guide:
Intake:
0.010-0.037
<
Limit >: 0.08
mm
Exhaust:
0.025
~
0.052
<
Limit >: 0.10
mm
(1)
Bore gauge
2.
Replace:
•
Vatve guide
Replacement:
NOTE:
Heat
the cylinder
head
in
an oven
at
100"C
to
facilitate
the removal
and
installation of the guides
and
to
mainiain correct locking interference.
•
Remove
the valve guide using the special
punch
•
Install
the
new
guide using the special installa-
tion tool
(2).
•
After installing the
valve guide, bore
with special
tool
(3)
to
obtain valve-guide free play.
j^2J
6
mm
guide valve puller:
<Z
|
P/N YM-04064-A
P/N 90890-04064
6
mm
valve
guide
installer:
P/N YM-04065
P/N 90890-04065
6
mm
valve guide
borer:
P/N
YM-04066
P/N 90890-04066
4-27
4-28