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4. ENGINE
Fig . 93 CD Valve seat width
Fig. 94 CD Dial gauge
® Valve
Fig . 95 CD Vernier caliper ® Valve spring
Fig . 96 CD Straight edge ® Feeler gauge
2. Check the vah·e seat contact width and
if necessary recondition.
Apply a thin coat of red lead to the
valve seat surface. Press the valve
against the seat and rotate it to check
if the contact width is uniform.
If not,
lap the valve, seat and again check the
contact width.
If necessary, recondition
the valve seat using a valve seat grinder .
Seat width
1.0......., 1.5 mm (0.039.......,0.059
in. ).
Caution:
Use the valve seat grinder in accordance
with the instruction manual.
3. Measure valve runout.
Place the valve on V-block and measure
the runout of the valve with a dial
gauge applied to the face of the valve
while turning the valve. Replace the valve
if the runout beyonds the serviceable
limit.
4. Measure the ,·alve spring.
Measure the free length of the valve
spring with a vernier caliper.
5. Measure the flatness of the cylinder head.
Place a straight edge on the cylinder
head surface and measure the clearance
at several points with a feeler gauge.
If there is a clearance of over the service-
able limit. lap the cylinder head surface
on the surface plate using lapping com-
pound or replace the head
if it cannot
be repaired.
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