Mitsubishi 380. Manual — part 840
LOWER ARM
FRONT SUSPENSION
33-14
REMOVAL SERVICE POINT
.
<<A>> LOWER ARM AND KNUCKLE DISCON-
NECTION
CAUTION
• Do not remove the nut from ball joint. Loosen it and use
special tool MB991897 to avoid possible damage to ball
joint threads.
• Hang special tool MB991897 with a cord to prevent it
from falling.
1. Loosen nut and remove bolt. If bolt is difficult to remove use
a soft drift to loosen from knuckle.
2. Use a large flat blade to spring clamp apart if required and
remove ball joint from knuckle.
INSPECTION
M1332001700316
• Check the bushing for wear and deterioration.
• Check the lower arm assembly for bending or breakage.
• Check all bolts for condition and straightness.
.
LOWER ARM BALL JOINT BREAKAWAY TORQUE
CHECK
Required Special Tool:
• MB990326: Preload Socket
1. Move the ball joint stud several times and install the lower
arm nut on the stud. Using special tool MB990326, measure
the ball joint breakaway torque.
Standard value: 3.5
− 6.9 N⋅m (31 − 61 in-lb)
2. If the measured value is not within the standard value, or if
the ball joint is difficult to turn or does not turn smoothly,
replace the lower arm assembly.
.
LOWER ARM BALL JOINT DUST COVER CHECK
1. Check the dust cover for cracks or damage by pushing it
with your finger.
2. If the dust cover is cracked or damaged, replace the lower
arm assembly.
NOTE: Cracks or damage to the dust cover may cause
damage to the ball joint. When it is damaged during service
work, replace the dust cover.
12DB014A
BOLT
NUT
AC305846 AB
MB990326
LOWER ARM
FRONT SUSPENSION
33-15
LOWER ARM BALL JOINT DUST COVER
REPLACEMENT
M1332008200282
Required Special Tool:
• MB990776: Front Axle Base
If the dust cover is damaged accidentally during service work,
replace the dust cover as follows:
1. Remove the dust cover.
2. Apply the multipurpose grease SAE J310, NLGI No.2 or
equivalent to the lip and the inside of a new dust cover.
Grease amount for the inside the dust cover (refer-
ence): 13
± 0.5 g (0.45 ± 0.02 oz)
3. Using special tool MB990776, drive in the dust cover until it
is fully seated.
4. Position the dust cover as shown in the illustration. Make
sure that there is no abnormal bulge or pressure applied to
the dust cover.
5. Check the dust cover for cracks or damage by pushing it
with your finger.
AC305847
AB
MB990776
DUST COVER
AC205611
AC305736 AB
32.3 mm
1.27 in
DUST COVER
LOWER ARM
FRONT SUSPENSION
33-16
LOWER ARM BUSHING (REAR) REPLACEMENT
M1332008100371
Required Special Tools:
• MB991963: Suspension Bushing Arbor
• MB990889: Rear Suspension Bushing Ring
• MB990890: Rear Suspension Bushing Base
Replace the lower arm bushing as follows:
1. Use special tools MB991963 and MB990890 to drive out the
lower arm bushing.
AC306250 AB
LOWER ARM BUSHING
AC207421
AB
MB991963
MB990890
LOWER ARM
ASSEMBLY
LOWER ARM
BUSHING
LOWER ARM
FRONT SUSPENSION
33-17
2. Position the lower arm bushing so that its projections are
positioned as shown, and then use special tools MB991963,
MB990889 and MB990890 to press in the lower arm
bushing.
CAUTION
When pressing in the lower arm bushing, take care not to
deform the lower arm.
3. Press the lower arm bushing until its outer tube is flush with
the lower arm assembly surface while checking that the
press-in pressure is at the standard value. If the press-in
pressure is lower than the standard value, replace the lower
arm assembly.
Standard value: 10 kN (2,248 pounds) or more
AC207423
AB
PROJECTIONS
30˚± 3˚
LOWER ARM ASSEMBLY
AC207422
AB
MB991963
MB990890
LOWER ARM
ASSEMBLY
MB990889
LOWER ARM
BUSHING
OUTER TUBE
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