8.
CYLINDER HEAD
(1)
Visual Inspection
A
cylinder head integrating two cylinders into
The
surface
of the head
is
checked
to
see
if
there
one and made by high precision quality casting
are any traces of coolant
or
gas
leakage. ~h~
in.
is
used.
side of the head is checked to ascertain that
it
is
Both the intake ports and the exhaust ports are
not clogged up anywhere by accumulated debris
integrated in the cylinder head, and overall engine
and that there
is
no corrosion.
design and construction has been simplified by
eliminating manifolds.
(2)
Inspecting
by
Testing Equipment
Item
90 degrees
1
2.
standsrd
dimemion
Intake:
0.2755-0.2761
(7+0.015)
+O
Exhaust:
0.2763-0.2775
!
(7+0.020
+0.050)
0.2736-0.2740
1
17-o.040
-0.050)
Intake:
0.~15-0.0025
(0.040-0.0651
Exhaust:
0,001 7-0.0027
(0.045--0.070)
0.0696 (1.771
-
-
1.4370 136.5)
Inner diameter
of
valve guider (after
assembly)
Outer
diameter
of valve Remr
Replacement limit
0.0031 (0.08)
-0.0039 (-0.1)
0.0059 10.151
0.0984 (2.5)
0.0197 (0.51
2 degrees
1.6142
(41)
Testing equipment
Wire gauge
Micrometer
Caiipen
lCalipen
Calipers
Unit:
in
(mm)
1
lllunmion
[Check thor rhe reading
is
wrhm the standard
dimension]
b-
3. Wearance
beween
valve guide and
valve stem
4.
Valve
seat width:
Intake
Exhaust
5.'
6.
Amount of
valve
sinkage
Valve springs:
Inclination
Free length
7.
!
Valve reat angle.
intakelexhaurt
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