
4G9 ENGINE (E - W) -
Cylinder Head and Valves
11A-9-9
PWEE9502-C
E
July 1997
Mitsubishi Motors Corporation
Revised
INSPECTION
CYLINDER HEAD
(1) Check the cylinder head gasket surface for flatness by
using a straightedge and thickness gauge.
Standard value: 0.03 mm
Limit: 0.2 mm
(2) If the service limit is exceeded, correct to meet the
specification.
Grinding limit:*0.2 mm
*Includes/combined with cylinder block grinding
Cylinder head height (Specification when new):
119.9 - 120.1 mm <SOHC>
131.9 - 132.1 mm <DOHC>
119.8 - 120.0 mm <DOHC - MIVEC>
131.9 - 132.1 mm <DOHC - GDI>
VALVE
(1) Check the valve face for correct contact. If incorrect,
reface using a valve refacer. Valve should make a uniform
contact with the seat at the centre of valve face.
(2) If the margin is smaller than the service limit, replace
the valve.
Standard value
mm
Limit mm
Intake
1.0
0.5
Exhaust
SOHC
1.3
0.8
DOHC
1.2
0.7
(3) Measure the overall height of the valve. If the specified
limit is exceeded, replace the valve.
Standard value
mm
Limit mm
Intake
SOHC
110.15
109.65
DOHC
104.19
103.69
DOHC-MIVEC
115.63
115.13
DOHC-GDI
104.19
103.69
Exhaust
SOHC
113.70
113.20
DOHC
103.87
103.37
DOHC-MIVEC
115.63
115.13
DOHC-GDI
103.87
103.37
Valve seat contact
Margin