Mitsubishi Galant. Manual — part 70
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.0L>
11D-29
Required Special Tools:
MD998051: Cylinder Head Bolt Wrench
MD998772: Valve Spring Compressor
MD998774: Valve Stem Seal Installer
REMOVAL SERVICE POINTS
<<A>> CYLINDER HEAD BOLT REMOVAL
Using special tool MD998051, loosen the cylinder head bolts.
Loosen each bolt evenly, little by little, by two or three steps.
<<B>> RETAINER LOCK REMOVAL
1. Set special tool MD998772 as illustrated to compress the
valve spring. Remove the retainer locks.
2. Relieve the spring tension and remove the valve, retainer,
spring, etc.
Store removed valves, springs and other parts, tagged to
indicate their cylinder number and location for assembly.
INSTALLATION SERVICE POINTS
>>A<< VALVE STEM SEAL INSTALLATION
1. Install the valve spring seat.
REMOVAL STEPS
<<A>>
>>D<<
1. CYLINDER HEAD BOLT
>>D<<
2. WASHER
3 CYLINDER HEAD ASSEMBLY
4. CYLINDER HEAD GASKET
<<B>>
>>C<<
5. RETAINER LOCK
6. VALVE SPRING RETAINER
>>B<<
7. VALVE SPRING
8. INLET VALVE
<<B>>
>>C<<
9. RETAINER LOCK
10.VALVE SPRING RETAINER
>>B<<
11. VALVE SPRING
12.EXHAUST VALVE
>>A<<
13.VALVE STEM SEAL
14.VALVE SPRING SEAT
>>A<<
15.VALVE STEM SEAL
16.VALVE SPRING SEAT
17.INLET VALVE GUIDE
18.SNAP RING
19.EXHAUST VALVE GUIDE
20.INLET VALVE SEAT
21.EXHAUST VALVE SEAT
22.CYLINDER HEAD
REMOVAL STEPS (Continued)
AKX00616
MD998051
AB
AKX00617
MD998772
AB
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.0L>
11D-30
CAUTION
The valve stem seal for the exhaust side is different than
the intake side. They are identified by their respective
rubber colors. When installing, do not confuse them.
CAUTION
The special tool must be used to install the valve stem
seal. Improper installation could result in oil leaking past
the valve guide.
2. Using special tool MD998774, install a new stem seal to the
valve guide.
>>B<< VALVE SPRING INSTALLATION
Install the valve spring with its ID color painted end (larger pitch
side) upward (toward the valve spring retainer).
>>C<< RETAINER LOCK INSTALLATION
CAUTION
Do not compress the valve spring excessively. It can
damage the stem seal.
1. Set special tool MD998772 as illustrated to compress the
valve spring. Install the retainer locks.
2. Relieve the spring tension and check that the retainer locks
are seated correctly.
AKX00642
EXHAUST
RUBBER COLOR:
GRAY
RUBBER COLOR:
GRAY GREEN
INTAKE
AB
AKX00618AB
MD998774
AKX00718
SPRING SEAT
SPRING
RETAINER
IDENTIFI-
CATION
COLOR
STEM SEAL
AB
AKX00617
MD998772
AB
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.0L>
11D-31
>>D<< CYLINDER HEAD BOLT INSTALLATION
1. Insert the cylinder head bolt with a washer attached into the
bolt hole in the cylinder head. The washer must be set with
the "rounded shoulder" side upward.
2. Tighten the cylinder head bolts to the specified torque in the
sequence shown.
Tightening torque: 108 N
⋅⋅⋅⋅
m (80 ft-lb)
3. Loosen all bolts fully.
4. Retighten the cylinder head bolts to the specified torque in
the sequence shown.
Tightening torque: 108 N
⋅⋅⋅⋅
m (80 ft-lb)
INSPECTION
M1113007000044
CYLINDER HEAD
1. Check the cylinder head gasket surface for flatness by using
a straightedge and feeler gauge 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 it exceeds the limit, correct to meet the specification.
Grinding limit: *0.2 mm (0.007 inch)
*Includes combined with cylinder block grinding.
Cylinder head height (specification when new):
120 mm (4.7 inches)
AKX00657
CYLINDER HEAD BOLT
ROUNDED
SHOULDER
WASHER
CYLINDER
HEAD
AB
AKX00673
MD998051
TIMING BELT SIDE
AB
AKX00733
CYLINDER HEAD AND VALVES
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ENGINE OVERHAUL <3.0L>
11D-32
VALVE
1. Check the valve seat contact. The valve seat contact should
be uniform at the center of the valve face. If incorrect, reface
using a valve refacer.
2. If the margin is below the 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 the limit, replace the valve.
Standard value:
<Intake> 112.30 mm (4.421 inches)
<Exhaust> 114.11 mm (4.493 inches)
Minimum limit:
<Intake> 111.80 mm (4.402 inches)
<Exhaust> 113.61 mm (4.473 inches)
VALVE SPRINGS
1. Measure the free height of the springs. If it is less than the
limit, replace.
Standard value: 51.0 mm (2.01 inches)
Minimum limit: 50.0 mm (1.97 inches)
2. Measure the squareness of the springs. If it exceeds the
limit, replace.
Standard value: 2 degree angle
Limit: 4 degree angle
VALVE GUIDES
Measure the clearance between the valve guide and valve
stem. If it exceeds the limit, replace the valve guide or valve, or
both.
Standard value:
Intake 0.02
−−−−
0.05 mm (0.0008
−−−−
0.0019 inch)
Exhaust 0.04
−−−−
0.07 mm (0.0016
−−−−
0.0027 inch)
Limit:
Intake 0.10 mm (0.003 inch)
Exhaust 0.15 mm (0.005 inch)
AKX00619
MARGIN
VALVE SEAT
CONTACT
AB
AKX00624
AKX00607
2˚
FREE
HEIGHT
AB
AKX00714
VALVE
GUIDE
STEM OD
GUIDE ID
AB
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