Mitsubishi Lancer Evolution 7. Manual — part 167
ENGINE OVERHAUL -
Cylinder Head and Valve
11B-45
5. VALVE SEAT
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
Valve Seat Correction
1. Before correcting the valve seat, inspect the clearance
between the valve guide and valve, and replace the valve
guide if necessary.
2. Correct so that the seat width and seat angle are at the
specified shape.
3. After correcting, apply wrapping compound, and fit the
valve and valve seat together.
Valve Seat Replacement
1. Grind off the valve seat to be replaced from the inside
to reduce the thickness and then remove the valve seat.
2. Machine the valve seat hole on the cylinder head to match
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
3. When pressing in the valve seat, cool the valve seat
with liquid nitrogen, and make sure that the inner diameter
of the cylinder head is not galled.
4. Refer to the “Valve Seat Correction” procedures, and
machine the valve seat.
Valve shaft end
Spring seat surface
Valve protrusion
amount
10_
65_
10_
65_
0.9 - 1.3 mm
0.9 - 1.3 mm
43.5_ - 44_
43.5_ - 44_
0.5 - 1.0 mm
0.5 - 1.0 mm
Grind off
Valve
seat
height
Oversized hole diameter
ENGINE OVERHAUL -
Cylinder Head and Valve
11B-46
Valve Guide Replacement
1. Using a press, push the valve guide to the cylinder block
side.
2. Machine the valve guide hole on the cylinder head to
match the oversized valve guide into which it is to be
pressed in.
Caution
Do not use a valve guide having the same size as
the removed valve guide.
Valve guide hole diameter:
0.05 O.S. 12.05 - 12.07 mm
0.25 O.S. 12.25 - 12.27 mm
0.50 O.S. 12.50 - 12.52 mm
3. Press in the valve guide to the dimensions shown in
the illustration.
NOTE
(1) Press in the valve guide from the top of the cylinder
head.
(2) Note that the length of the valve guides differs.
Intake
45.5 mm
Exhaust
50.5 mm
4. After pressing in the valve guide, insert a new valve,
and confirm the sliding state.
19.2 - 19.8 mm
ENGINE OVERHAUL -
Oil Pump and Oil Pan
11B-47
OIL PUMP AND OIL PAN
REMOVAL AND INSTALLATION
2
1
Apply engine oil on
all sliding sections
before installing.
4
5
6
12
13
16
18
7
20
3
8
9
10
14
15
17
19
11
39 ± 5 N•m
54 ± 5 N•m
19 ± 3 N•m
36 ± 3 N•m
23 ± 3 N•m
17 ± 1 N•m
10 ± 2 N•m
9 ± 3 N•m
22 ± 4 N•m
23 ± 3 N•m
19 ± 3 N•m
44 ± 5 N•m
23 ± 3 N•m
25
24
23
22
21
26
27
29
30
31
28
19 ± 3 N•m
Removal steps
1. Drain plug
"
NA 2. Drain plug gasket
"
MA 3. Oil filter
A
A" "LA 4. Oil pan
5. Oil screen
6. Oil screen gasket
7. Baffle plate
"
KA 8. Oil pressure switch
9. Oil cooler bypass valve
10. Relief plug
11. Gasket
12. Relief spring
13. Relief plunger
14. Oil filter bracket
15. Oil filter bracket gasket
A
B" "JA 16. Plug cap
17. O-ring
A
C" "IA 18. Flange bolt
"
HA 19. Oil pump case
20. Oil pump case gasket
21. Oil pump cover
"
GA 22. Oil pump driven gear
"
GA 23. Oil pump drive gear
"
FA 24. Crankshaft front oil seal
"
EA 25. Counter balance shaft oil seal
"
DA 26. Oil pump oil seal
27. Counter balance shaft, right
28. Counter balance shaft, left
A
D" "CA 29. Counter balance shaft front bearing
A
E" "BA 30. Counter balance shaft rear bearing,
right
A
E" "AA 31. Counter balance shaft rear bearing,
left
ENGINE OVERHAUL -
Oil Pump and Oil Pan
11B-48
REMOVAL SERVICE POINTS
A
A" OIL PAN REMOVAL
1. Remove the oil pan tightening bolts.
2. Tap the special tool between the oil pan and cylinder
block.
3. Tap on the edge of the special tool, slide the tool and
remove the oil pan.
A
B" PLUG CAP REMOVAL
Fit the special tool (MD998162) into the notch on the plug
cap as shown in the illustration. Loosen the plug cap while
supporting with the special tool (MD998783).
A
C" FLANGE BOLT REMOVAL
1. Remove the plug on the left side of the cylinder block,
and insert a Phillips driver (shaft diameter 8 mm) by 60
mm or more to stop the rotation of the counter balance
shaft left.
2. Loosen the flange bolt.
A
D" COUNTER BALANCE SHAFT FRONT BEARING
REMOVAL
Pull out the counter balance shaft front bearing from the
cylinder block using the special tool.
Caution
Always remove the counter balance shaft front bearing
first. Otherwise, the counter balance shaft rear bearing
cannot be removed.
MD998727
MD998162
MD998783
Plug
Phillips driver
MD998371
Front bearing
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