Hyundai 20G-7, Руководство по обслуживанию

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CYLINDER HEAD ASSEMBLY
2-74
VALVE SEAT RING REPLACEMENT
1. If the valve seat insert is excessively worn, cut the insert
ring wall as shown in the illustration A using a valve seat
cutter at a normal temperature.
Valve seat ring oversize
Item
Cylinder insert height
H (mm)
Size
(mm)
Size mark
Cylinder head I.D
(mm)
33.330 ~ 33.325
33.600 ~ 33.625
28.800 ~ 28.821
29.100 ~ 29.121
7.5 ~ 7.7
7.8 ~ 8.0
7.9 ~ 8.1
8.2 ~ 8.4
0.3 OS
0.6 OS
0.3 OS
0.6 OS
30
60
30
60
Intake valve seat ring
L4GC118A
2. After removing the seat ring, Cut the seat insert bore as
same size as the following table using a reamer or cutter.
3. Heat the cylinder head to 250°C and press-fit the oversize
seat.
At this time the oversize seat ring maintains a normal room
temperature.
After installing a new valve seat, correct the valve seat
surface.
Exhaust valve seat ring
D
A B
0.5~1.0mm
0.15~0.3mm
0.3mmR
New hole
Old hole
H
Removal