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F8QT ENGINE -
Camshaft, Intake and Exhaust Valves
11A-13-5
VALVE SEAT
Valve seat width
(1) Replace the valveseat
24, 25
if the limitvalue is exceeded.
Angle
A
: intake valve seat: 60 _
exhaust valve seat: 45_
The contact surface
B
must be 1.7
± 0.1 mm.
If the contact surface is t oo wide, correct this with a valve
seat cutter.
Cutter angle:
Angle
C
: intake valve seat: 45 _
exhaust valve seat: 30_
Caution
D
The outside diameter of the cutter for the valve
seat must not be more than:
intake valve seat: 37.0 mm
exhaust valve seat: 32.1 mm
After cutting, th e dimension
D
must be 0.125
± 0.025
mm.
NOTE
After correcting or replacing the valve seat
24, 25
, the
valve seat and the valve
16, 17
should be matched by
grinding them together in order to obtain correct seating.
CYLINDER HEAD
(1) Check the cylinder head gasket surface
31
for distortion.
Fit a new cylinder head if the limit value is exceeded.
CORRECTION
INTAKE VALVE AND EXHAUST VALVE
Caution
D
The amount of material removed by grinding should
be restricted to a minimum.
D
Replace the valve 16, 17 if the margin of the valve
seat after grinding is smaller than the limit value.
D
After the grinding operation, the valve 16, 17 should
be matched with the valve seat 24, 25 by lapping
them together in order to obtain correct seating.
PWEE9602
E
July 1996Mitsubishi Motors Corporation
REN0061
A
C
B
D
REN0062
4ME0130