Mitsubishi Motors 4G9 - Manual (Page 137)

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4G9 ENGINE (E–W) – Cylinder Head and Valves
11A-9-10
PWEE9502-A
E
Nov. 1995 Mitsubishi Motors Corporation Revised
VALVE SPRING
(1) Measure the valve spring’s free height. If the measurement
is less than specified, replace the spring.
Standard value
mm
Limit mm
SOHC (with adjusting screw) 50.9 49.9
SOHC (with lash adjuster) 49.5 48.5
DOHC 45.0 44.0
DOHC–MIVEC 51.5 50.5
DOHC–GDI 44.8 43.8
(2) Measure the squareness of the spring. If the measurement
exceeds the specified limit, replace the spring.
Standard value: 2
_
or less
Limit: 4
_
VALVE SEAT
(1) Assemble the valve, then measure the valve stem
projection between the end of the valve stem and the
spring seating surface. If the measurement exceeds the
specified limit, replace the valve seat.
Standard value
mm
Limit mm
Intake SOHC 49.30 49.80
DOHC 46.70 47.20
DOHC–MIVEC 57.85 58.35
DOHC–GDI 46.65 47.15
Exhaust SOHC 49.35 49.85
DOHC 46.65 47.15
DOHC–MIVEC 58.13 58.63
DOHC–GDI 46.70 47.20
VALVE GUIDE
(1) Measure the clearnace between the valve guide and valve
stem. If the limit is exceeded, replace the valve guide
or valve, or both.
Standard value:
Intake: 0.02 – 0.05 mm
Exhaust: 0.05 – 0.09 mm
<SOHC, DOHC, DOHC–MIVEC, DOHC–GDI for
CARISMA, SPACE STAR, SPACE RUNNER,
GALANT>
0.04 – 0.06 mm <DOHC–GDI for PAJERO io>
Limit:
Intake: 0.10 mm
Exhaust: 0.15 mm
PWEE9502-K
E
Jun. 2002 Mitsubishi Motors Corporation Revised
Out of square
Free height
Valve stem end
Valve stem
projection
Spring seating
surface
Valve
guide