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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 g u ~
!
(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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