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4G6 ENGINE (E-W) -
Cylinder Head and Valves
11A-9-8
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.
Item Standard value mm Limit mm
SOHC Intake 0.02 - 0.05 0.10
Exhaust 0.03 - 0.07 0.15
GDI Intake 0.02 - 0.05 0.10
Exhaust 0.05 - 0.09 0.15
VALVE SEAT
(1) Assemble the valve, then measure the valve stem
projection between the end of the valve stem and the
spring seating surface. If the measurement exceeds the
specified limit, replace the valve seat.
Item Standard value mm Limit mm
SOHC Intake 49.30 49.80
Exhaust 49.30 49.80
GDI Intake 49.20 49.70
Exhaust 48.40 48.90
VALVE SEAT RECONDITIONING PROCEDURE
(1) Before correcting the valve seat, check for clearance
between the valve guide and valve and, if necessary,
replace the valve guide.
(2) Using the seat grinder, correct to obtain the specified
seat width and angle.
(3) After correcting the valve seat, lap the valve and valve
seat using lapping compound. Then, check the valve
stem projection (refer to VALVE SEAT in INSPECTION).
AddedPWEE9616-A
E
Aug. 1998Mitsubishi Motors Corporation
Valve
guide
DEN0212
Valve stem end
Valve stem
projection
Spring seating
surface
6EN0491
0.9 - 1.3 mm
43.5
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-44
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