Cylinder Head Inspection; Valve Inspection - Mitsubishi 4G9 User Manual

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