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4D68 ENGINE (E- W) -
Cylinder Head, Valves and Valve Springs
11A-9-5
VAL VE
(1) Check the valve face for correct contact. If incorrect, reface
using a valve refacer. Valve seat contact should be
maintained uniform at the center of valve face.
(2) If the margin is smaller than the service limit, replace
the valve.
Standard value: 1.5 mm
Limit: 0.7 mm
(3) Measure the overall height of the valve. If the specified
limit is exceeded, replace the valve.
Standard value:
Intake 114.05 mm
Exhaust 113.80 mm
Limit:
Intake 113.55 mm
Exhaust 113.30 mm
VALVE SPRING
(1) Measure the free height of the spring and, if it is smaller
than the limit, replace.
Standard value: 49.1 mm
Limit: 48.1 mm
(2) Measure the squareness of the spring and, if the limit
is exceeded, replace.
Standard value: 2
°
or less
Limit: Max. 4
°
VALVE GUIDE
(1) Measure the clearance between the valve guide and valve
stem. If the limit is exceeded, replace the valve guide
or valve, or both.
Standard value: 0.05 - 0.09 mm
Limit: 0.15 mm
VALVE SEAT
(1) Check the valve seat for trace of overheat and contact
with valve surface.
Standard value: 0.9 - 1.3 mm
PWEE9609
E
Dec. 1996Mitsubishi Motors Corporation
6EN0542
Valve seat
contact
Margin
1EN0264
Free
height
6EN0279
Guide I.D.
Stem O.D.
1EN033
Valve contact
width