Radius Arm: Service and Repair

REMOVAL AND INSTALLATION

CAUTION:
^ During maintenance, take care not to contact the parts or tools to the caliper, because the paint of caliper will be scratched. And if there is brake fluid on the caliper, wipe out quickly.
^ : To prevent bushings from breakage, the parts indicated by should be temporarily tightened, and then fully tightened with the vehicle on the ground in the unladen condition.

REMOVAL SERVICE POINTS
[[A]] LOWER ARM ASSEMBLY MOUNTING BOLT REMOVAL





Make mating marks on the lower arm and the decentering cam bolt, then remove the lower arm and the decentering cam bolt.

[[B]] ASSIST LINK AND KNUCKLE DISCONNECTION

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. Install special tool MB991897 as shown in the figure.





2. Turn the bolt and knob as necessary to make the jaws of special tool MB991897 parallel, tighten the bolt by hand and confirm that the jaws are still parallel.

NOTE: When adjusting the jaws in parallel, make sure the knob is in the position shown in the figure.

3. Tighten the bolt with a wrench to disconnect the assist link assembly and the knuckle.

[[C]] ASSIST LINK MOUNTING BOLT REMOVAL





Make mating marks on the assist link and the decentering cam bolt, then remove the toe control arm and the decentering cam bolt.

INSTALLATION SERVICE POINT
]]A[[ LOWER ARM ASSEMBLY INSTALLATION





Check the identification mark, install the lower arm assembly.

INSPECTION
ASSIST LINK BALL JOINT TURNING TORQUE CHECK

Required Special Tool:
^ MB990326: Preload Socket





1. After shaking the assist link ball joint stud several times, measure the turning torque of the assist link ball joint by using special tool MB990326.
Standard value: 0.5 - 2.5 Nm (4.4 - 22 inch lbs.)
2. When the measured value exceeds the standard value, replace the assist link.
3. When the measured value is lower than the standard value, check that the assist link ball joint turns smoothly without excessive play. If there is no excessive play, the ball joint can be reused.

ASSIST LINK SLIDE BUSHING TURNING TORQUE CHECK

Required Special Tool:
^ MB990326: Preload Socket





1. After inserting the bolt to the assist link slide bush and attaching the washer in the opposite direction, install the nut. After rotating the inner sleeve (include the washer) several times, measure the turning torque of the assist link slide bushing by using special tool MB990326.
Standard value: 0.5 - 2.0 Nm (4.4 - 17 inch lbs.)
2. When the measured value exceeds the standard value, replace the assist link.
3. When the measured value is lower than the standard value, check that the assist link slide bushing turns smoothly without excessive play. If there is no excessive play, the slide bushing can be reused.

ASSIST LINK 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 trailing arm assembly.

NOTE: Cracks or damage of the dust cover may cause dam age to the ball joint. When it is damaged during service work, replace the dust cover.

LOWER ARM PILLOW BALL BUSHING TURNING TORQUE CHECK

Required Special Tool:
^ MB990326: Preload Socket





1. Insert the bolt to the lower arm pillow ball bushing, in the opposite direction, insert the washer then install the nut. After rotating the inner sleeve (contained washer) several times, measure the turning torque of the lower arm below ball bushing using special tool MB990326.
Standard value: 0.5 - 3.0 Nm (4.4 - 26 inch lbs.)
2. When the measured value exceeds the standard value, replace the lower arm assembly.
3. When the measured value is lower than the standard value, check that the lower arm pillow ball bushing turns smoothly without excessive play. If there is no excessive play, the pillow ball bushing can be reused.

ASSIST LINK BALL JOINT DUST COVER REPLACEMENT

Required Special Tool:
^ MB990800: Ball Joint Remover and Installer





Only when the dust cover is damaged accidentally during service work, replace the dust cover as follows:
1. Remove the dust cover.
2. Fill the multipurpose grease in the dust cover and lubricate the lip [Amount of filling grease in the dust cover: approximately 7 g (0.247 ounce)].
3. Using special tool MB990800, punch the dust cover until it contacts the snap ring.
4. Press the dust cover with your finger to check that there are no cracks or damage in the dust cover.