Mitsubishi 4G1 Service Manual page 377

INSPECTION
CYLINDER HEAD
(2) If the service limit is exceeded, correct to meet the
VALVE
Ridge
wear
1 EN026:
(2) Check the valve face for correct contact. If incorrect, reface
(3) If the margin exceeds the service limit, replace the valve.
Revision
TSB
using a straightedge in the directions of A through G shown
in the illustration.
Standard value: 0.05 mm (.0020 in.)
Limit: 0.2 mm (.008 in.)
specification.
Grinding limit: "0.2 mm (.008 in.)
block.
Overall height: 84 mm (3.31 in.)
damaged, replace. Also replace the valve if the stem end
(that contacts the rocker arm adjusting screw) has a dent.
using a valve refacer. Valve should make a uniform contact
with the seat at the center of valve face.
Standard value:
Intake 1.2 mm (.047 in.)
Exhaust 2.0 mm (.079 in.)
Limit:
Intake 0.7 mm (.028 in.)
Exhaust 1.5 mm (.059 in.)