Mitsubishi 4G1 series, Service Manual

Page: 496 / 522

ENGINE
Cvlinder Head and Valves
Valve seat
contact
Margin
ree
eight
1
Grinding limit: mm in.)
Includes combined with cylinder block grinding.
Cylinder head height (Specification when new):
SOHC
89.9 90.1 mm (3.539 3.547 in.)
SOHC
119.9 120.1 mm (4.720 4.728 in.)
DOHC
131.9 132.1 mm (5.193 5.201 in.)
VALVE
Check the valve face for correct contact. If incorrect, reface
using valve Valve seat contact should be main-
tained uniform at the center of valve face.
(2) If the margin exceeds the service limit, replace the valve.
Standard value:
SOHC
Intake 1.2 mm in.)
Exhaust 2.0 mm in.)
SOHC
Intake 1.0 mm in.)
Exhaust 1.2 mm in.)
DOHC
Intake 1.0 mm in.)
Exhaust 1.5 mm in.)
Limit:
SOHC
Intake 0.7 mm in.)
Exhaust 1.5 mm in.)
SOHC
Intake 0.5 mm in.)
Exhaust 0.7 mm in.)
DOHC
I
Intake 0.7 mm in.)
,
Exhaust 1.0 mm in.)
VALVE SPRING
(1) Measure the free height of spring and, if it is smaller than
the limit, replace.
SOHC
Identification color: White
Standard value: 49.8 mm (1.961 in.)
Limit: 48.8 mm (1.921 in.)
SOHC
Identification color: White
Standard value: 51.0 mm (2.008 in.)
Limit 50.0 mm (1.969 in.)
DOHC
Identification color: Blue
Standard value: 48.3 mm (1.902 in.)
Limit: 47.3 (1.862 in.)
TSB Revision
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