1998 MITSUBISHI MONTERO Service Manual

AXLE RATIO SPECIFICATIONS








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Application Ratio
Montero ..................................................... 4.27:1
Montero Sport .................................................. (1)
( 1) - On vehicles equipped with wide fender, ratio is 4.64:1. On
vehicles with narrow fender, ratio is 4.27:1.









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LUBRICATION
CAPACITY
DIFFERENTIAL FLUID CAPACITY








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Application Specification
Montero & Montero Sport ............................ 2.4 Pts. (1.1L)\









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FLUID TYPE
All models use fluid type SAE 80W-90/API GL-5.
TROUBLE SHOOTING
NOTE: See TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
REMOVAL & INSTALLATION
AXLE SHAFTS R & I
Removal
1) Raise and support vehicle. Remove wheels and undercover.
Ensure hub is in free-wheeling position. Place transfer case in 2H
position. Remove drive hub cover, snap ring and shim from axle shaft.
See Fig. 3 . Remove brake calipers and support aside.
2) Disconnect tie rod assembly. Support lower control arm
with jack. Separate ball joints from knuckle. Remove knuckle and front
hub assembly. Using flat-blade pry bar, carefully remove left axle
shaft from differential carrier. DO NOT damage oil seal. On right axle
shaft, remove axle shaft-to-inner shaft flange retaining bolts. Remove
right axle shaft.
CAUTION: Replace circlips on BJ/DOJ splined shaft end.
Installation
1) Install right axle shaft on inner shaft flange. Install
new circlip on DOJ side of left axle shaft. Carefully install left
axle shaft into differential. DO NOT damage oil seal.
2) Reinstall knuckle with front hub assembly. To complete
installation, reverse removal procedure. Install shim and snap ring.
Check axle end play. See Fig. 4. End play should be .016-.028" (.4-.7
mm). If end play is not within specification, install correct shim.

Fig. 3: Exploded View Of Auto-Locking Hub Assembly (Typical)
Courtesy of Mitsubishi Motor Sales of America.
Fig. 4: Measuring Axle Shaft End Play
Courtesy of Mitsubishi Motor Sales of America.
DIFFERENTIAL CARRIER ASSEMBLY

Removal
1) Raise and support vehicle. Drain gear oil. Support
differential carrier. Remove axle shafts and inner shaft. See
AXLE SHAFTS R & I and
INNER SHAFT & BEARING . Place alignment mark on drive shaft and pinion
companion flange for reassembly reference.
2) Remove drive shaft. Remove differential mounting brackets
at differential and frame. See Fig. 1. Disconnect front crossmember
from frame. Remove differential carrier assembly and front
crossmember. Remove differential carrier from front crossmember.
Installation
To install, reverse removal procedure. Align marks on drive
shaft and pinion companion flange.
INNER SHAFT & BEARING
Removal
Remove right axle shaft. See AXLE SHAFTS R & I. Using slide
hammer, remove inner shaft from differential carrier. See Fig. 1. If
dust seal replacement is required, pry dust seal from housing tube
assembly using a screwdriver. To remove bearing, bend outer area of
dust cover inward on inner shaft. Press shaft out of bearing. Remove
dust cover from shaft.
Inspection
Inspect inner shaft for damaged splines or threads. Inspect
bearing for roughness or damage.
Installation
1) Install housing tube. Using Seal Installer (MB990955) and\
Handle (C-4171), install NEW dust seal in housing tube. Dust seal must\
be even with housing tube. Coat seal lip with grease.
2) Using a pipe with O.D. of 2.00" (75.0 mm), wall thickness\
of .16" (4.0 mm) and overall length of 2.00" (50.0 mm), install dust\
cover on shaft. Coat inside of dust cover with grease. Press bearing
on shaft. Install new circlip on inner shaft. Carefully drive inner
shaft into differential. DO NOT damage oil seal. To complete
installation, reverse removal procedure.
OVERHAUL
AXLE SHAFTS & BEARINGS
NOTE: References to BJ and DOJ refer to Birfield Joint and Double
Offset Joint, respectively.
Disassembly
1) Remove boot bands. Remove circlip from DOJ outer race.
Separate axle shaft from DOJ outer race. Remove balls from DOJ cage.
Remove DOJ cage from DOJ inner race in direction of BJ. See Fig. 2.
2) Remove snap ring from axle shaft shaft. Remove DOJ inner
race from shaft. Remove circlip from shaft. Wrap tape around splines
of shaft to prevent boot damage during removal. Remove DOJ boot. Note
size of boot. Remove dust cover from shaft. Move boot protector toward
BJ side of shaft and remove. Remove BJ boot.
CAUTION: Axle shaft and BJ are serviced as a unit. DO NOT attempt to
disassemble BJ and axle shaft.
Reassembly
1) Coat shaft with light coat of grease. Wrap splines with

tape. Install BJ boot, bands and DOJ boot on shaft. Ensure correct
size boot is installed in proper location.
2) Pack proper amount of grease in BJ and BJ boot. See
CV JOINT GREASE CAPACITY table. Boot bands must be installed so lever
is pulled toward rear of vehicle when band is tightened.
3) Place DOJ cage on shaft with smaller diameter installed
first. Install circlip, DOJ inner race and snap ring on shaft. Apply
grease to DOJ inner race and cage. Install balls into cage. Apply
proper amount of grease to outer DOJ race. See
CV JOINT GREASE CAPACITY table. Install shaft into DOJ outer race.
Install circlip.
4) Place DOJ boot over DOJ outer race. Install boot bands so
lever is pulled toward rear of vehicle when band is tightened. Adjust
DOJ boot bands to have proper distance between center line of boot
bands. Distance should be 3.03-3.27" (76.9-83.0 mm). This distance is
necessary to control air in DOJ boot. Tighten boot bands. Install boot
protector and band. Install dust cover on shaft.
CV JOINT GREASE CAPACITY









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Application ( 1) Ozs. (g)
BJ Boot & Joint
Montero ................................................ 4.6 (130)\
Montero Sport .......................................... 4.2 (120)\
DOJ Boot & Joint
Montero ................................................ 3.5 (100)\
Montero Sport .......................................... 4.9 (140)\
( 1) - Apply 1/2 of the amount of grease specified to joint, the other
half to inside of CV boot.









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DIFFERENTIAL ASSEMBLY
Disassembly
1) Remove differential carrier from vehicle. See
DIFFERENTIAL CARRIER ASSEMBLY under REMOVAL & INSTALLATION. Remove
cover. Mark bearing caps for reassembly reference. Remove bearing
caps. Remove differential case assembly from carrier.
CAUTION: Ensure adjusting spacers, bearing caps, gears and side
bearings are marked for reassembly reference. Components
must be installed in original location.
2) Using bearing puller, remove differential case side
bearings. Loosen ring gear retaining bolts in diagonal sequence.
Remove ring gear. Remove drive pinion shaft lock pin from ring gear
side. Remove pinion shaft and pinion gears. Remove side gears and
thrust spacers.
Drive Pinion Removal
Remove pinion flange nut. Scribe alignment mark on pinion
companion flange and drive pinion. Remove flange. Using soft-faced
hammer, drive out pinion. Remove rear bearing and oil seal from
carrier. Remove rear adjusting shim from pinion. See Fig. 1. Press
front bearing from pinion. Remove front adjusting shim and spacer from
pinion.
Cleaning & Inspection
Use cleaning solvent to rinse gears and components. Check
bearings for wear or discoloration. Check gear carrier for cracks or
damage. Check pinion, side gear and flange splines for excessive wear.

Check ring gear, pinion and side gears for wear or damage. Replace
components as necessary.
Reassembly & Adjustments
1) Place side gear thrust spacers behind side gears, in
original position. Assemble side gears in differential case. Install
pinion gears and washers. Rotate pinion gears to mesh with side gears.
2) Install pinion shaft without lock pin. Check pinion and
side gear backlash. Install wooden wedge to lock side gears. Using
dial indicator, measure gear backlash. See Fig. 5.
3) Backlash must be within specification. See
PINION & SIDE GEAR BACKLASH SPECIFICATIONS table. Adjust backlash by
using different side gear spacers. Ensure both sides are equally
shimmed. If backlash cannot be adjusted within specifications, replace
side and pinion gears as matched set.
4) Install pinion shaft lock pin. Using a punch, securely
stake lock pin in 2 places. Ensure adhesive is removed from ring gear
mounting bolts and gear mounting surface. Clean internal threads with
tap.
5) Install ring gear on differential case. Ensure alignment
marks on differential case and ring gear are aligned. Apply Loctite
271 to bolts and install bolts. Tighten bolts alternately in diagonal
sequence to specification. See TORQUE SPECIFICATIONS.
PINION & SIDE GEAR BACKLASH SPECIFICATIONS









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Application In. (mm)\
Standard ................................................ .003 (.08)\
Wear Limit .............................................. .008 (.20)\









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Fig. 5: Checking Pinion & Side Gear Backlash
Courtesy of Mitsubishi Motor Sales of America.
Drive Pinion Depth
1) Install pinion bearing races in carrier housing. Ensure

races are fully seated. Install Pinion Height Gauge (MB990901-01) with\
pinion bearings. See Fig. 6. DO NOT install oil seal.
2) Using INCH-lb. torque wrench, measure pinion rotating
torque. Gradually tighten pinion height gauge to increase rotating
torque to proper specification. See
PINION ROTATING TORQUE SPECIFICATIONS table. Install Cylinder Gauge
(MB990903-01). Ensure flat areas are aligned and that gauge contacts
carrier bearing bores firmly. See Fig. 6.
3) Select adjusting shim with same thickness as gap between
cylinder gauge and pinion height gauge. Use minimum amount of
adjusting shims. Install selected adjusting shims between drive pinion
gear and rear drive pinion bearing. Using Bearing Installer (MB990802-
01), install rear pinion bearing.
PINION ROTATING TORQUE SPECIFICATIONS









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Application INCH Lbs. (N.m)\
Oil Seal Not Installed
With Lubrication ............................... 1.3-2.2 (.15-.25)\
Without Lubrication ............................ 2.6-4.3 (.30-.50)\
Oil Seal Installed
With Lubrication ............................... 3.1-3.9 (.35-.45)\
Without Lubrication ............................ 4.3-6.1 (.50-.70)\









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Fig. 6: Setting Drive Pinion Depth
Courtesy of Mitsubishi Motor Sales of America.
Drive Pinion Preload
1) Install drive pinion in differential carrier. Install

spacer, pinion front shim(s) and front pinion bearing. DO NOT install
oil seal at this time. Install pinion companion flange, washer and
retaining nut. Tighten nut to 137 ft. lbs. (190 N.m).
2) Using INCH-lb. torque wrench, check pinion rotating torque
without pinion oil seal. See PINION ROTATING TORQUE SPECIFICATIONS
table. Adjust rotating torque by replacing drive pinion front shims or
spacer. Once correct rotating torque is obtained, install oil seal.
Coat seal lip with grease.
3) Install pinion flange so alignment marks are correct.
Apply light coat of grease to flange washer contact area. Install NEW
retaining nut. Check pinion rotating torque with pinion oil seal
installed. Rotating torque must be within specification. See
PINION ROTATING TORQUE SPECIFICATIONS table.
Side Bearing Installation
1) Using Bearing Installer (MB990802-01), install bearings o\
n
differential case. Select 2 side bearing adjusting shims thinner than
those removed. Shims must be equal in thickness on both sides. Install
shims on each side of case assembly. Install case assembly in
differential carrier housing.
2) Push case assembly fully to one side of carrier. Using 2
feeler gauges (feeler gauges 180 degrees opposed), measure clearance
between carrier and side bearing. Remove shims from one side of
differential carrier.
3) Measure thickness of shims removed. Add .002" (.05 mm) to\
50% of measured clearance and then add thickness measurement of
removed shim. This is thickness of new shim that should be installed
on each side of case. Install equal thickness shims on each side of
case assembly.
NOTE: Ensure zero clearance exists between gear carrier and
adjusting shim.
4) Install side bearing shims and differential case assembly
in differential carrier. Using brass drift, tap shims to fit them to
side bearing outer race. Install bearing caps. Tighten bolts to
specification. See TORQUE SPECIFICATIONS . Check ring gear backlash.
Ring Gear Backlash
1) Lock drive pinion in place. Using dial indicator, check
ring gear backlash at heel of ring gear tooth. Measure at 4 locations
of ring gear. Gear backlash should be .004-.006" (.10-.15 mm).
2) If backlash is not within specification, change side
bearing adjusting shims and recheck backlash. See
GEAR TOOTH CONTACT PATTERNS article in GENERAL INFORMATION. Check gear
tooth contact using Prussian Blue.
CAUTION: When changing shims, total thickness of all shims must
remain constant to ensure correct bearing preload.
Ring Gear Runout
Using dial indicator, measure runout at back side of ring
gear. Runout should not exceed .002" (.05 mm). If runout is excessive,\
change ring gear-to-differential case mounting position. Ensure ring
gear mounting bolts are tightened to correct specification. Recheck
runout. Install cover and gasket.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Application Ft. Lbs. (N.m)\

Brake Caliper Bolt ......................................... 65 (88)\
Carrier-To-Housing Tube Bolt
Montero ...................................................... (1)
Montero Sport ...................................... 58-72 (79-98)\
Differential
Cover Bolt ............................................... 14 (19)\
Drain Plug
Montero .......................................... 43-51 (58-69)\
Montero Sport .............................................. ( 1)
Fill Plug
Montero ................................................ 39 (53)\
Montero Sport .......................................... 36 (49)\
Drive Shaft Flange Bolt .............................. 36-43 (49-58)\
Front Crossmember Bolt .............................. 72-87 (98-118)\
Hub Cover Bolt ....................................... 13-25 (18-34)\
Knuckle-To-Ball Joint Nut
Upper
Montero ................................................ 54 (73)\
Montero Sport .................................... 44-65 (60-88)\
Lower
Montero .............................................. 108 (146)\
Montero Sport ............. .................. 87-130 (118-176)\
Mounting Bracket-To-Frame Bolt ...................... 58-80 (79-108)\
Mounting Bracket-To-Housing Tube Bolt ................ 58-72 (79-98)\
Pinion Flange Nut
Montero
A/T .................................................. 137 (186)\
M/T .................................................. 159 (216)\
Montero Sport .......................................... 159 (216)\
Right Drive Axle-To-Inner Shaft Bolt ................. 36-43 (49-58)\
Ring Gear-To-Case Bolt ............................... 58-65 (79-88)\
Side Bearing Cap Bolt ................................ 40-47 (54-64)\
Tie Rod-To-Knuckle Nut
Montero .................................................. 33 (45)\
Montero Sport ............................................ 32 (43)\
Wheel Lug Nuts
Montero ........................................... 72-87 (98-118)\
Montero Sport
Aluminum Wheel .................................. 73-86 (99-117)\
Steel Wheel ................................... 87-101 (118-137)\
INCH Lbs. (N.m)
Undercover-To-Frame Bolts (Montero) .............. 84-108 (9.5-12.2\
)
( 1) - Information is not available from manufacturer.









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