Valve Guide; Valve Seat; Valve Seat Reconditioning Procedure - Mitsubishi 4G6 series Workshop Manual

11A-9-8
Valve
guide
E
Mitsubishi Motors Corporation
4G6 ENGINE (E - W) -
Valve stem end
Valve stem
projection
Spring seating
surface
DEN0212
0.9 - 1.3 mm
43.5_ - 44_
6EN0491
Aug. 1998
Cylinder Head and Valves

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
SOHC Intake
Exhaust
GDI Intake
Exhaust

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
SOHC Intake
Exhaust
GDI Intake
Exhaust

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).
PWEE9616-A
Standard value mm Limit mm
0.02 - 0.05 0.10
0.03 - 0.07 0.15
0.02 - 0.05 0.10
0.05 - 0.09 0.15
Standard value mm Limit mm
49.30 49.80
49.30 49.80
49.20 49.70
48.40 48.90
Added