Mitsubishi Montero (1991+). Manual - part 192

 

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Mitsubishi Montero (1991+). Manual - part 192

 

 

SUSPENSION - FRONT (4WD) 



1991 Mitsubishi Montero

         1990-92 SUSPENSION

         Front - 4WD Trucks

         Chrysler Motors; Ram-50

         Mitsubishi; Montero, Pickup

         DESCRIPTION

         The independent front suspension uses upper and lower control

arm and torsion bar construction. The components used with this system

are upper control arm, lower control arm, torsion bar, shock absorber,

stabilizer bar, steering knuckle, drive shaft and front differential.

See Fig. 1.

Fig. 1:  Replacing Upper Ball Joint (Montero)

Courtesy of Mitsubishi Motor Sales of America.

         BALL JOINT CHECKING

         LOWER BALL JOINT

         Place ball joint in soft-jawed vise. Install dial indicator,

with stem resting on end of ball joint stud. Measure ball joint stud

end play. Replace ball joint if end play exceeds .02" (.5 mm).

         UPPER BALL JOINT

         1) With ball joint disconnected from steering knuckle, place

nut on ball joint stud. Using INCH lb. torque wrench, measure starting

torque required to rotate ball joint stud.

         2) Starting torque must be 7-30 INCH lbs. (.8-3.4 N.m). If

starting torque is not within specification, replace ball joint

(Montero) or upper arm (Ram-50 and Pickup). For ball joint replacement

on Montero, see UPPER BALL JOINT under REMOVAL & INSTALLATION.

         WHEEL BEARINGS ADJUST

         PRELOAD

         1) Remove locking hub assembly. See LOCKING HUB under REMOVAL

& INSTALLATION. Remove lock washer-to-lock nut bolts and lock washer.

Remove brake caliper to ensure brake pads are not contacting rotor.

         2) Using Socket (MB990954-01) and torque wrench, rotate front

hub and tighten lock nut to 95-145 ft. lbs. (129-197 N.m) to seat

bearings. Loosen nut.

         3) Retighten nut to 18 ft. lbs. (24 N.m) and loosen 30-40

degrees. After setting preload, check hub turning resistance and axial

play.

         HUB TURNING RESISTANCE & AXIAL PLAY

         1) Using INCH lb. torque wrench or spring scale attached to

wheel stud, measure hub turning resistance. Turning resistance should

be 1-4 lbs. (.45-1.8 kg) if measured with spring scale or 2.6-11.3

INCH lbs. (.3-1.3 N.m) if measured with torque wrench.

         2) Using dial indicator, check front hub axial play. Axial

play should be .002" (.05 mm) or less. Adjust wheel bearing so turning

resistance and axial play are within specification. If turning

resistance and axial play cannot be adjusted to specifications, check

wheel bearing condition and installation. Install lock washer.

         3) If lock washer and lock nut holes are not aligned, align

holes by loosening lock nut a maximum of 40 degrees. Install lock

washer bolts to lock nut. Tighten lock washer bolts. Install locking

hub.

         LOWER BALL JOINT R & I

         REMOVAL

         1) Raise and support vehicle. Remove wheel assembly. Support

lower control arm enough to release torsion bar tension. Loosen but DO

NOT remove lower ball joint-to-steering knuckle nut.

         2) Using ball joint separator, separate ball joint from

steering knuckle. Remove ball joint nut from steering knuckle. Remove

ball joint-to-lower control arm bolts. Remove ball joint.

         INSTALLATION

         Lubricate ball joint with SAE J310 NLGI No. 2 grease. Apply

semi-drying sealant to ball joint grooves. Reverse removal procedure

to complete installation. Tighten bolts to specification. See TORQUE

SPECIFICATIONS table at end of article.

NOTE:    On Ram-50 and Pickup, replace upper control arm if ball

         joint is defective.

         UPPER BALL JOINT R & I (MONTERO)

         REMOVAL

         Remove snap ring and dust cover together from ball joint. See

Fig. 1. Use Ball Joint Remover/Installer (MB990799-01 and MB990800-01)

and Clamp (MB990840-01) to press ball joint from control arm. Tighten

clamp to remove ball joint.

         INSTALLATION

         1) Before installing, align reference mark on ball joint with

center of control arm. Using bushing remover/installers, install ball

joint in control arm. See Fig. 1.

         2) Install snap ring on ball joint. Lubricate ball joint with

SAE J310 NLGI No. 2 grease. Apply semi-drying sealant to ball joint

grooves. Install new dust cover and ring.

         AUTOMATIC TYPE LOCKING HUB R & I

         REMOVAL

         1) Place hub must in the FREE position by placing transfer

case lever in 2H position and moving vehicle in Reverse approximately

4-6 feet.

         2) Remove cover from locking hub. If necessary, wrap shop

towel around cover and use an oil filter wrench to loosen cover. Raise

and support vehicle. Remove wheel assembly.

         3) Using snap ring pliers, remove snap ring and shim from end

of drive axle. See Fig. 2. Using hexagonal wrench, remove locking hub

retaining bolts. Remove locking hub assembly.

Fig. 2:  Exploded View of Automatic Locking Hub

Courtesy of Chrysler Motors.

         INSTALLATION

         1) Using Socket (MB990954) and torque wrench, rotate front

hub and tighten lock nut to 95-145 ft. lbs. (129-197 N.m) to seat

bearings. Loosen nut. Retighten nut to 18 ft. lbs. (24 N.m) and loosen

30-40 degrees.

         2) Using spring scale attached to wheel stud, measure and

record turning resistance required to rotate hub/rotor assembly before

installing locking hub.

         3) Apply semi-drying sealant on locking hub assembly-to-

hub/rotor contact areas. DO NOT apply sealant on outer areas of

hub/rotor assembly, toward brake contact areas.

         4) Align locking hub assembly key area with steering knuckle

keyway area. Loosely install locking hub assembly on hub/rotor

assembly. Ensure locking hub assembly fully contacts hub/rotor

assembly.

         5) Install locking hub retaining bolts. Tighten to

specification. See TORQUE SPECIFICATIONS table at end of article.

Using spring scale attached to wheel stud, measure turning resistance

required to rotate hub/rotor assembly.

         6) Subtract turning resistance measured in step 2) (before

installing locking hub) from turning resistance measured in step 5)

(after installing locking hub). If difference exceeds 3.1 lbs. (14 N),

check for incorrect installation of locking hub assembly or

components.

         7) Install shim and snap ring on drive axle. Rotate drive

axle until maximum end play is obtained. Using dial indicator, check

drive axle end play.

         8) Drive axle end play should be .008-.020" (.20-.51 mm). If

end play is not within specification, adjust drive axle end play by

changing axle shaft shim. Install new "O" ring and cover. Tighten

cover to specification. See TORQUE SPECIFICATIONS table at end of

article.

         LOWER CONTROL ARM R & I

         REMOVAL

         1) Raise and support vehicle. Remove wheel assembly. Remove

front skid plate and undercover (if equipped). Remove torsion bar. See

TORSION BAR under REMOVAL & INSTALLATION. Remove stabilizer bar bolt

from control arm.

         2) Remove shock absorber-to-control arm bolts. Loosen but DO

NOT remove lower ball joint-to-steering knuckle nut. Using ball joint

fork, separate lower ball joint from steering knuckle.

         3) Remove ball joint stud nut from steering knuckle. Remove

control arm shaft. See Fig. 1. Remove torque arm. Remove lower control

arm pivot bolt. Remove lower control arm.

         INSPECTION

         1) Inspect control arm for cracks or deformation. Check ball

joints. See BALL JOINT CHECKING under ADJUSTMENTS & INSPECTION.

         2) Inspect ball joint dust covers for damage. Replace dust

covers if damaged. Inspect control arm bushing and frame bracket

bushing for damage. Replace if necessary.

         3) If frame bracket bushing needs replacing, install Bushing

Remover/Installer (MB990958-01) in bushing. See  Fig. 3. Tighten

bushing remover/installer bolt until bushing is removed. Reverse

bushing remover/installer to install bushing.

NOTE:    Differential carrier may require relocation to replace left

         bracket bushing.

 

 

 

 

 

 

 

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