3) Inspection and correction of valve seat
(1) Measure the contacting face
between the intake valve seat and
exhaust valve seat for valve seat
wear, and replace if the measured
value exceeds the specified limit.
(2) Install the valve into the valve seat on
the cylinder head, and check the
amount of depression of the valve
from the lower portion of the cylinder
head using a dial gauge.
If the amount of depression is beyond the specified limit, replace the valve seat.
(3) For removal of the valve seat, apply arc welding work to two points of valve seat insert,
and pull out valve seat insert with inner extractor.
(4) Undercool a new valve seat with dry ice for about 2 hours and press the valve seat insert
into position in the cylinder head using a special tool(bench press).
(5) Apply valve lapping compound to the valve head seating face on the valve seat and lap
the valve seat by turning it until it is seated in position, then wipe out the lapping com-
pound.
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EQM3049I
4) Inspection and correction of valve spring
(1) Visually check the exterior of the
valve springs for damage, and
replace if necessary.
(2) Measure free length and spring ten-
sion with a valve spring tester.
(3) Measure the spring inclination with a
square.
(4) Compare the measured value with
the standard value to determine
whether to replace or repair.
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