1991 MITSUBISHI MONTERO differential
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2) Remove 2 seal plugs. Remove 2 poppet springs and steel
balls. Shift transfer case to "4WD" and pull high-low shift rail out,
in rear cover direction. Remove interlock plunger. Remove pulse
generator (if equipped), front output shaft cover and pulse rotor (if\
equipped). Remove snap ring from rear bearing on output shaft. Remove
chain cover, oil guide and side cover. Remove countershaft locking
plate. Remove countershaft.
3) Remove countergear, 2 thrust washers, 2 needle bearings
and spacer through side cover opening. Remove snap ring, spring
retainers and spring from 2WD-4WD shift rail. Remove front output
shaft, rear output shaft and chain as assembly.
4) Remove 2WD-4WD shift fork and distance piece. Drive out
2WD-4WD shift rail spring pin. Remove 2WD-4WD shift rail and lug.
Remove high-low shift fork and high-low synchronizer sleeve. Remove
needle bearing and snap ring from input gear. Remove input gear
assembly.
5) If either control shaft or input gear oil seals are to be
replaced, drive out roll pin from transmission control change shifter.
Separate transfer case from adapter. See Fig. 3.
Disassembly (Montero)
1) Remove dynamic damper, 5 detection switches and 3 steel
balls. Remove poppet plug, spring and steel ball. Remove speedometer
gear assembly. Remove output shaft rear cover, spacers, dust seal
guard and oil seals. Front output shaft cover, wave spring and spacer
(if equipped).
2) Remove high-low shift rail plug and high-low shift fork
spring pin. Shift transfer case to "4WD". Remove rear cover and high-
low shift rail. Remove interlock plunger. Remove rear output shaft
(viscous coupling) assembly and center differential assembly. Remove
2WD-4WD synchronizer assembly, chain and front output shaft from
transmission as a unit. With White paint make match marks in grooves
of 2WD-4WD synchronizer in 3 places. With White paint make match marks
on spline projections of 2WD-4WD synchronizer sleeve in 3 places.
Refer to match marks during reassembly.
3) Remove snap ring, spring seat, spring, 2WD-4WD shift fork
and 2WD-4WD synchronizer sleeve. Remove differential lock hub, oil dam
cover and bearing retainer. Remove side cover and gasket. Remove
transfer counter gear shaft, transfer counter gear, thrust washer,
needle bearings and spacer. Remove transfer drive shaft assembly.
Remove high-low shift fork assembly and clutch sleeve. Remove transfer
input gear assembly.
4) Remove 2WD-4WD shift lug spring pin, spring, spring
retainer 2WD-4WD shift lug and shift rail. Remove input gear oil seal,
baffle plate, dust seal guard and front output shaft oil seal. See
Fig. 4 .
COMPONENT DISASSEMBLY & REASSEMBLY
OUTPUT SHAFT ASSEMBLY (MONTERO)
Disassembly & Reassembly (Rear Shaft)
Remove snap ring and press ball bearing off without putting
pressure on vicious coupling. Remove viscous coupling. To install,
reverse removal procedure. When installing new snap ring, select
thickest ring that will fit into groove. Acceptable clearance is 0-.
003" (0-.08 mm).
Disassembly & Reassembly (Front Shaft)
Remove front bearing. Remove rear bearing. To install reverse
removal procedure.
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Disassembly & Reassembly
Remove snap ring, high-low synchronizer hub and low speed
gear. Remove bearing spacer, needle bearing and ball bearing. To
assemble, reverse disassembly procedure. Use thickest snap ring that
will fit into output shaft groove. Acceptable clearance is 0-.003" (0-
.08 mm). See Fig. 4.
INPUT SHAFT ASSEMBLY (RAM-50)
Disassembly & Reassembly
1) Remove snap ring from input shaft. Support bearing in
press. Press input shaft out to remove bearing.
2) On manual transmission models, remove spacer and snap ring
from below bearing. Remove cone spring and sub gear. See Fig. 6. For
reassembly, reverse disassembly procedures.
3) Press bearing into input shaft, pushing against inner
race. After fitting, ensure bearing rotates smoothly. Fit snap ring
over front end of input shaft. Snap rings are available in selective
thicknesses. Select thickest snap ring that will fit in groove.
Fig. 6: Exploded View Of Input Shaft Assembly (Ram-50 - Manual
Shown, Automatic Similar)
Courtesy of Mitsubishi Motor Sales of America.
CENTER DIFFERENTIAL CASE (MONTERO)
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Disassembly & Reassembly
Separate center differential case front from rear case.
Remove pinion shaft, pinions, thrust washers and dowel pins. Inspect
for excessive wear and replace parts as needed. Align dowel pins and
match marks on outer case circumferences. Assemble front and rear
center differential cases. See the TORQUE SPECIFICATIONS table. Also,
see Fig. 7 .
Fig. 7: Exploded View Of Center Differential (Montero)
Courtesy of Mitsubishi Motor Sales of America.
2WD-4WD SYNCHRONIZER (MONTERO)
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Fig. 10: Aligning Speedometer Sleeve
Courtesy of Mitsubishi Motor Sales of America.
Reassembly (Montero)
1) Install input gear and front output shaft oil seals into
transfer case housing. Install transfer input gear assembly baffle
plate and input gear seal. Pack grease between lips of seals and press
seal circumference uniformly.
2) Install 2WD-4WD shift lug into transfer case. Install
spring retainer and spring to shift rail and install into shift lug.
Press on shift rail to align spring pin holes in shift rail and shift
lug. While holding shift rail, tap spring pin into place with slit
facing center of shift rail.
3) Install transfer input gear assembly and snap ring. Select
thickest snap ring that will fit into groove. Allowed snap ring
clearance is 0-.0024" (0-.060 mm). Insert needle bearing onto transfer\
drive shaft assembly. Install high-low synchronizer sleeve and shift
fork assembly. Install transfer drive shaft assembly.
4) Install transfer countergear shaft thrust washers, needle
bearings, bearing spacer and transfer countergear. Install one thrust
washer at each end of transfer countergear. Ensure tab on thrust
washers fits into groove of transfer case. Install counter gear shaft
from transmission case side so lock plate groove is aligned with lock
plate. Install lock plate. Install side cover and gasket.
5) Install bearing retainer. If reusing bearing retainer
bolts, apply Locking Adhesive (3M 4170 Stud Lock) to threads. Install
oil dam cover. Install differential lock hub, snap ring, steel ball
and sleeve. Select thickest snap ring that will fit into groove.
Allowed snap ring clearance is 0-.003" (0-.08 mm). Install 2WD-4WD
synchronizer sleeve, 2WD-4WD shift fork, spring, spring seat and 2WD-
Page 1165 of 1333
4WD shift rail snap ring.
6) Assemble front output shaft assembly, chain and 2WD-4WD
synchronizer assembly. Align match marks made during disassembly. Link
chain tightly onto 2WD-4WD synchronizer and front output shaft
sprockets. Install both sprockets and chain to transfer case at same
time, while keeping them as far apart as possible.
7) Install center differential case assembly, rear output
shaft assembly needle bearings and rear output shaft assembly. Install
interlock plunger so it does not interfere with 2WD-4WD shift rail.
Evenly apply sealant to chain cover and install chain cover.
8) Install high-low shift rail through high-low shift rail
hole into shift fork. Align spring pin holes in high-low shift rail
and shift fork. Tap in spring pin so slit is facing shift rail shaft
center. Install and tighten high-low shift rail plug to specification.
See TORQUE SPECIFICATIONS .
9) Before installing front output shaft cover, measure
protrusion "A" of front output shaft rear bearing and recess "B" of
cover and calculate clearance. See Fig. 11. If clearance is greater
than .079" (2.00 mm), select and install spacer to bring clearance
within specification. If clearance is less than .079" (2.00 mm), use
wave spring alone. Apply sealant to both sides of gasket and install
gasket and cover. Apply Locking Adhesive (3M 4170 Stud Lock) to bolts
and tighten to specification. See TORQUE SPECIFICATIONS.
Fig. 11: Measuring Rear Output Shaft Bearing Clearance (Montero)
Courtesy of Mitsubishi Motor Sales of America.
10) Install rear output shaft ball bearing snap ring. Measure
clearance between chain cover and snap ring. Add .0008-.0039" (.02-.10
Page 1167 of 1333
![MITSUBISHI MONTERO 1991 Service Manual TORQUE SPECIFICATIONS TABLE \
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Application](/manual-img/19/57332/w960_57332-1166.png "MITSUBISHI MONTERO 1991 Service Manual TORQUE SPECIFICATIONS TABLE \
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Application")
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Adapter-To-Transfer Bearing Retainer ......... (1) 14 (19)
Case Nuts & Bolts .......................... 22-31 (30-42)
Center Differential Case Bolts ................... 48 (65)
Chain Cover Bolt ........................... 22-31 (30-42)
Detection Switch ............................. ( 1) 27 (36)
Drain Plug ................................. 22-26 (30-35)
Dynamic Damper ................................... 52 (70)
High-Low Shift Rail Plug ..................... ( 1) 24 (33)
Interlock Plunger Plug ................. ( 1) 22-26 (30-35)
Lock Plate Bolts ........................... 11-16 (15-22)
Oil Dam Cover ................................ ( 1) 14 (19)
Oil Filler Plug ............................ 22-26 (30-35)
Output Shaft Cover Bolt .................... 11-16 (15-22)
Poppet Plug .................................. ( 1) 27 (36)
Pulse Rotor Bolt ....................... ( 2) 11-16 (15-22)
Rear Cover Bolt ............................ 11-16 (15-22)
Rear Output Shaft Lock Nut ............... 74-96 (100-130)
Seal Plug .............................. ( 2) 22-31 (30-42)
Speedometer Sleeve Clamp Bolt .............. 11-16 (15-22)
4WD Indicator Light Switch ................... ( 2) 22 (33)
INCH Lbs. (N.m)
Pulse Generator Bolt .................. ( 2) 89-106 (10-12)
Side Cover Bolt ............................. 71-89 (8-10)
( 1) - Montero.
( 2) - Ram-50.
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WIRING DIAGRAMS
Page 1168 of 1333
Fig. 13: Rear Differential Lock Circuit (Montero)
Page 1231 of 1333
Excessive Noise Loose pump-to-drive Tighten screws
assembly screws
Loose tube on pump assembly Tighten tube
Valves not functioning Replace valves
properly
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Oil Leakage Loose end plug Tighten end plug
Bad seal crimp Remove and re-crimp
seal
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MANUAL TRANSMISSION
MANUAL TRANSMISSION TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
MANUAL TRANSMISSION/TRANSAXLE TROUBLE SHOOTING
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Condition Possible Cause \
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Noisy In Forward Gears .Low gear oil level,
.Loose bell housing bolts,
.Worn bearings or gears
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Clunk On Deceleration
(FWD Only) .Loose engine mounts,
.Worn inboard CV joints,
.Worn differential pinion shaft,
.Side gear hub counterbore
in case worn oversize
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Gear Clash When Shifting
Forward Gears .Clutch Out Of Adjustment,
.Shift linkage damaged or
out of adjustment,
.Gears or synchronizers damaged,
.Low gear oil level
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Transmission Noisy When
Moving (RWD Only) Quiet In
Neutral With Clutch Engaged .Worn rear outputshaft bearing
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Gear Rattle .Worn bearings,
.Wrong gear oil,
.Low gear oil,
.Worn gears
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Steady Ticking At Idle
(Increases With RPM) .Broken tooth on gear
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Gear Clash When Shifting
Forward Gears .Worn or broken synchronizers
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Loud Whine In Reverse .Normal condition ( 1) \
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