Mitsubishi Galant 9G. Manual — part 609
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.8L ENGINE>
11D-34
INSPECTION
M1113007000464
.
CYLINDER HEAD
1. Check the cylinder head gasket surface for flatness by using
a straightedge in the directions of A through G shown in the
illustration.
Standard value: 0.03 mm (0.0012 inch)
Limit: 0.2 mm (0.007 inch)
2. If the service limit is exceeded, correct to meet the
specification.
Grinding limit: *0.2 mm (0.007 inch)
3. *If the service limit is exceeded, correct to meet the
specification.
Cylinder head height (specification when new):
120 mm (4.7 inches)
.
VALVE
1. Check the valve face for correct contact. If incorrect, reface
using a valve refacer. The valve should make a uniform
contact with the seat at the center of the valve face.
2. If the margin exceeds the service minimum limit, replace the
valve.
Standard value:
<Intake> 1.0 mm (0.04 inch)
<Exhaust> 1.2 mm (0.05 inch)
Minimum limit:
<Intake> 0.5 mm (0.02 inch)
<Exhaust> 0.7 mm (0.03 inch)
3. Measure the valve's total length. If the measurement is less
than specified, replace the valve.
Standard value:
<Intake> 110.30 mm (4.343 inches)
<Exhaust> 112.11 mm (4.414 inches)
Minimum limit:
<Intake> 109.80 mm (4.323 inches)
<Exhaust> 111.61 mm (4.394 inches)
.
AKX00733
AKX00619
MARGIN
VALVE SEAT
CONTACT
AB
AKX00624
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.8L ENGINE>
11D-35
VALVE SPRINGS
1. Measure the free height of the spring and, if it is smaller than
the minimum limit, replace the spring.
Standard value: 51.0 mm (2.01 inches)
Minimum limit: 50.0 mm (1.97 inches)
2. Measure the squareness of the spring and, if the limit is
exceeded, replace the spring.
Standard value: 2
° or less
Limit: 4
°
.
VALVE GUIDES
Measure the clearance between the valve guide and valve
stem. If the limit is exceeded, replace the valve guide, valve, or
both.
Standard value:
<Intake> 0.02
− 0.05 mm (0.0008 − 0.0019 inch)
<Exhaust> 0.04
− 0.06 mm (0.0016 − 0.0023 inch)
Limit:
<Intake> 0.10 mm (0.003 inch)
<Exhaust> 0.15 mm (0.005 inch)
.
VALVE SEAT
Assemble the valve, then measure the valve stem projection
between the end of the valve stem and the spring seating sur-
face. If the measurement exceeds the specified limit, replace
the valve seat.
Standard value:
<Intake> 48.30 mm (1.902 inches)
<Exhaust> 51.71 mm (2.036 inches)
Limit:
<Intake> 48.80 mm (1.921 inches)
<Exhaust> 52.21 mm (2.056 inches)
.
VALVE SEAT RECONDITIONING PROCEDURE
CAUTION
Before correcting the valve seat, check the clearance
between the valve guide and valve and, if necessary,
replace the valve guide.
1. Using the special tool or a seat grinder, correct to obtain the
specified seat width and angle.
2. After correcting the valve seat, lap the valve and valve seat
using lapping compound. Then, check the valve stem
projection.
.
AKX00607
2˚
FREE
HEIGHT
AB
AKX00714
VALVE
GUIDE
STEM OUTSIDE
DIAMETER
GUIDE INSIDE DIAMETER
AB
AKX00695
SPRING SEATING
SURFACE
VALVE STEM END
VALVE STEM
PROJECTION
AB
AK101830AB
0.9 – 1.3 mm
(0.04 – 0.05 in)
65˚
65˚
15˚
25˚
43.5˚ – 44˚
0.9 – 1.3 mm
(0.04 – 0.05 in)
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.8L ENGINE>
11D-36
VALVE SEAT REPLACEMENT PROCEDURE
CAUTION
Before replacing the valve seat, check the valve guide and,
if necessary, replace the valve guide.
1. Cut the valve seat from the inside to thin the wall thickness.
Then, remove the valve seat.
2. Rebore the valve seat hole in the cylinder head to a selected
oversize valve seat diameter.
Seat ring hole diameter:
Intake valve
0.3 oversize 37.80
− 37.83 mm (1.4882 − 1.4894
inches)
0.6 oversize 38.10
− 38.13 mm (1.5000 − 1.5012
inches)
Exhaust valve
0.3 oversize 34.80
− 34.83 mm (1.3701 − 1.3713
inches)
0.6 oversize 35.10
− 35.13 mm (1.3819 − 1.3831
inches)
3. Before fitting the valve seat, either heat the cylinder head up
to approximately 250
°C (482°F) or cool the valve seat in
liquid nitrogen, to prevent the cylinder head bore from
galling.
4. Using a valve seat cutter, correct the valve seat to the
specified width and angle. Using a valve seat cutter, correct
the valve seat to the specified width and angle. See "VALVE
SEAT RECONDITIONING PROCEDURE" on the previous
page.
.
VALVE GUIDE REPLACEMENT PROCEDURE
1. Remove the snap ring from the exhaust valve guide.
2. Using a press, remove the valve guide toward the cylinder
head gasket surface.
CAUTION
Do not install a valve guide of the same size again.
3. Re-bore the valve guide hole of the cylinder head so that it
fits the press-fitted oversize valve guide.
Valve guide hole diameter:
0.05 oversize 11.05
− 11.07 mm (0.4350 − 0.4358 inch)
0.25 oversize 11.25
− 11.27 mm (0.4429 − 0.4437 inch)
0.50 oversize 11.50
− 11.52 mm (0.4528 − 0.4535 inch)
4. Install the new snap ring into the groove of exhaust valve
guide.
AKX00610
0.5 – 1 mm
(0.020 – 0.039 in)
0.5 – 1 mm (0.020 – 0.039 in)
CUT
AWAY
AB
AKX00611
HEIGHT OF
SEAT RING
OVERSIZE DIAMETER
AB
AKX00712
REMOVAL
INSTALLATION
PRESS
PRESS
PUSH ROD
VALVE
GUIDE
VALVE
GUIDE
AB
OIL PAN AND OIL PUMP
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ENGINE OVERHAUL <3.8L ENGINE>
11D-37
5. Press-fit the valve guide until it protrudes 14 mm (0.55 inch)
from the cylinder head top surface as shown in the
illustration.
NOTE: When press-fitting the valve guide, work from the cylin-
der head top surface.
NOTE: After installing the valve guides, insert new valves in
them to check for sliding condition.
OIL PAN AND OIL PUMP
REMOVAL AND INSTALLATION
M1113008100420
AKX00727
14 mm
(0.55 in)
AB
AK302971
14 ± 1 N·m
122 ± 9 in-lb
10 ± 2 N·m
87 ± 17 in-lb
19 ± 3 N·m
14 ± 2 ft-lb
11 ± 1 N·m
95 ± 9 in-lb
39 ± 5 N·m
29 ± 4 ft-lb
9.0 ± 3.0 N·m
80 ± 26 in-lb
10.8 ± 0.9 N·m
96 ± 7 in-lb
9.0 ± 3.0 N·m
80 ± 26 in-lb
9.0 ± 2.0 N·m
80 ± 17 in-lb
44 ± 5 N·m
33 ± 4 ft-lb
23 ± 3 N·m
18 ± 2 ft-lb
10 ± 2 N·m
87 ± 17 in-lb
41 ± 8 N·m
30 ± 6 ft-lb
4
3
1
2
17
7
5
9
8
10
6
14
13
12
11
14 ± 2 N·m
122 ± 17 in-lb
20
19
18
21
22
23
11 ± 1 N·m
95 ± 9 in-lb
15
16
AC
APPLY ENGINE OIL
TO ALL MOVING
PARTS BEFORE
INSTALLATION.
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