Chapter 2 Basic Engine
_2_.
C_J_,J_in_d_e_r_R_ea_d
__________________________
J.4JlIS(B)(C)E
2-3.2 Inspection
of
valve seat
wear
and contact
surface
Inspect
for valve seat scratches and excessive wear.
Check to make sure the contact surface
is
normal. The
seat angle must be checked and adjusted
if
the valve seat
contact surface is much smatler than the width of the
valve seat.
NOTE: Keep
in
mind
the fact that the intake
and
discharge
valve have different diameters.
2-3.3 Valve sinking
Over long periods
of
use and repeated lappings, combus•
tion efficiency may drop. Measure the sinking distance
and replace the valve and valve seat
if the valve sink
exceeds
the tolerance.
Sink
Depth
gauge
mm
Standard Wear limit
Valve sink
0.306~0.506
1.0
2-3.4 Valve guide
(1} Measuring inner diameter
of
valve guide.
Measure the inner diameter of
the
valve guide and
replace
it
if
it exceeds the wear limit.
mm
Standard Wear limit
Valve guide
I Intake
,f,
8.01
0~
¢ 8.025
+0.2
inside dia.
!Exhaust
¢8.015~¢8.030
+0.2
NOT£:
The
inner
diameter
standard
dimensions
assume a pressure
fit.
Primed
in
J.apan
HlNSHI-H8009
2-7
(2) Replacing the valve guide
Use the insertion tool and tap in the guide with a
mallet
Tool
The intake valve guide and exhaust valve guide
are
of
different shapes/dimensions. The one with a groove
around
it is the exhaust valve guide and the one with-
out
is
the intake valve guide.
I
Exhaust
valve
gu~
!
(3) Valve guide projection
E
E
0)
"St
-
j
'
-
I I
E
E
Intake
vav, gu<l: I
The valve guide should project 15mm from the top
of the cylinder head.
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