Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1394

ENGINE OVERHAUL -
Valve shaft end
Valve protrusion
amount
Spring seat surface
0.9 - 1.3 mm
65_
10_
43.5_ - 44_
0.5 - 1.0 mm
Grind off
Valve
seat
height
Oversized hole diameter
5. VALVE SEAT
Valve Seat Correction
0.9 - 1.3 mm
1. Before correcting the valve seat, inspect the clearance
65_
2. Correct so that the seat width and seat angle are at the
3. After correcting, apply wrapping compound, and fit the
43.5_ - 44_
10_
Valve Seat Replacement
1. Grind off the valve seat to be replaced from the inside
2. Machine the valve seat hole on the cylinder head to match
0.5 - 1.0 mm
3. When pressing in the valve seat, cool the valve seat
4. Refer to the "Valve Seat Correction" procedures, and
Cylinder Head and Valve
Assemble the valve, and measure the amount that the
valve protrudes from the valve shaft end between the
spring seat surfaces when the valve is pressed against
the valve seat. Replace the valve seat if the protrusion
amount exceeds the limit value.
Standard value:
Intake 49.20 mm
Exhaust 48.40 mm
Limit value:
Intake 49.70 mm
Exhaust 48.90 mm
between the valve guide and valve, and replace the valve
guide if necessary.
specified shape.
valve and valve seat together.
to reduce the thickness and then remove the valve seat.
the diameter of the oversized valve seat into which it
is to be pressed in.
Intake valve seat hole diameter:
0.3 O.S. 35.30 - 35.33 mm
0.6 O.S. 35.60 - 35.63 mm
Exhaust valve seat hole diameter:
0.3 O.S. 33.30 - 33.33 mm
0.6 O.S. 33.60 - 33.63 mm
with liquid nitrogen, and make sure that the inner diameter
of the cylinder head is not galled.
machine the valve seat.
11B-45