Inspect the clearance between valve rod and guide pipe. If the clearance exceeds
repair limit value, replace it with a No.1 bigger valve guide pipe.
Standard Value
Air intake: 0.020 ～ 0.047 mm
Air exhaust: 0.050 ～ 0.085 mm
Limiting value Air intake: 0.l mm
Air exhaust: 0.15 mm
5) Repair Valve Seat
Inspect whether valve seat overheats and
whether valve surface has nonuniform
contact. If necessary, repair or replace
valve seat. Before repairing valve seat,
inspect whether valve guide pipe has
abrasion. If valve guide pipe has
abrasion, replace valve guide pipe and
repair valve seat. Use a valve seat grinder
or milling cutter to repair valve seat.
Valve seat contacting width should be
within the specified range, and located at
the centre of valve surface.
After repairing, use grinding cream to
grind valve and valve seat.
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