•
For removal of the valve seat, apply
arc welding work to two points of valve
seat insert, and pull out the valve seat
insert with inner extractor.
•
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).
•
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 seat-
ed in position, then wipe out the lapping compound.
4) Valve spring
•
Visual check
Visually check the exterior of the valve springs for damage, and replace if necessary.
•
Functional check
- Measure free length and spring ten-
sion with a valve spring tester.
(Refer to appendix)
- Measure the spring inclination with
a square.
- Compare the measured value with
the standard value to determine
whether to replace or repair.
- 64 -
INSPECTION AND MEASUREMENT
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