Mitsubishi 380. Manual — part 451
CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <3.8L ENGINE>
11B-30
Required Special Tools:
• MB991999: Valve Stem Seal Installer
• MD998051: Cylinder Head Bolt Wrench
• MD998735: Valve Spring Compressor
• MD998772: Valve Spring Compressor
REMOVAL SERVICE POINTS
.
<<A>> CYLINDER HEAD BOLT REMOVAL
Use special tool MD998051 to loosen the cylinder head bolt.
.
<<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)
AK302682AB
MD998051
CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <3.8L ENGINE>
11B-31
<<B>> RETAINER LOCK REMOVAL
1. Using special tool MD998735 or MD998772, compress the
spring.
2. Remove the retainer locks.
NOTE: Tag removed valves, springs and other components,
noting their cylinder numbers and locations to facilitate reas-
sembly. Store these components safely.
AK100166
MD998735
AB
AKX00617
MD998772
AB
CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <3.8L ENGINE>
11B-32
INSTALLATION SERVICE POINTS
.
>>A<< VALVE STEM SEAL INSTALLATION
1. Install the valve spring seat.
CAUTION
• Valve stem seals for intake valves and for exhaust
valves are different. Be sure to install the correct ones.
• Valve stem seal identification color
Intake: GRAY
Exhaust: GRAY GREEN
CAUTION
Always use the special tool to install the valve stem seal.
Improperly installed valve stem seals may leak oil.
2. Using special tool MB991999, install a new stem seal to the
valve guide.
.
>>B<< VALVE SPRING INSTALLATION
Install the valve spring end with its identification color toward
the spring retainer.
.
AK303630
EXHAUST
RUBBER COLOR:
GRAY
RUBBER COLOR:
GRAY GREEN
INTAKE
AB
AKX00618AC
MB991999
AKX00718
SPRING SEAT
SPRING
RETAINER
IDENTIFI-
CATION
COLOR
STEM SEAL
AB
CYLINDER HEAD AND VALVES
ENGINE OVERHAUL <3.8L ENGINE>
11B-33
>>C<< RETAINER LOCK INSTALLATION
Using special tool MD998735 or MD998772, compress the
valve spring and insert the retainer lock into position.
NOTE: The valve spring, if excessively compressed, causes
the bottom end of retainer to damage the stem seal.
.
>>D<< CYLINDER HEAD BOLT INSTALLATION
CAUTION
Attach the head bolt washer in the direction shown in the
figure.
1. Tighten the bolts in the illustrated sequence two or three
steps.
Tightening torque: 108
± 5 N⋅m (80 ± 4 ft-lb)
2. Back off the bolts once and tighten them again to the
specified torque in step1.
AK100166
MD998735
AB
AKX00617
MD998772
AB
AKX01452AB
FRONT
MD998051
HEAD
BOLT
WASHER
RIGHT
BANK
LEFT
BANK
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