JAC S5 - Valve Guide Pipe and Seat Servicing; Valve Guide Pipe and Seat Repair

S5 Workshop Manual Engine
EM-45
Valve Spring
Standard value
Free height: 45.8 mm
Load: 25.3 kg / 40 mm
Verticality: 1.5° or below
Limiting value
Free height: 44.82 mm
Verticality: 4°
Valve Guide Pipe
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.
4) Clearance between Valve Rod and 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.
EM073
EM072
EM071
Verticality 2°
Height
Valve guide
pipe
Inner diameter measurement
of valve guide pipe
Diameter
measurement
Guide rod
Rimer
Exhaust
valve seat
ring
Intake
valve seat
ring
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