1991 MITSUBISHI MONTERO engine

RWD Models
Torque Converter-To-Drive Plate Bolt
Montero ...................................... 25-30 (34-41)
Pickup ....................................... 33-38 (45-52)
Transmission-To-Engine Block Bolt
Montero
10x40-mm Bolt .............................. 22-30 (30-41)
12x40-mm Bolt .............................. 47-61 (64-83)
12x55-mm Bolt .............................. 58-72 (79-98)
Pickup
10x16-mm Bolt .............................. 22-30 (30-41)
10x50-mm Bolt .............................. 31-40 (42-54)
10x70-mm Bolt .............................. 31-40 (42-54)
(1) - Tighten to 84-108 INCH lbs. (10-12 N.m).









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TR AN SM IS SIO N S ER VIC IN G - A /T

1991 M it s u bis h i M onte ro
1991 TRANSMISSION SERVICING
Automatic Transmission
Mitsubishi: Eclipse, Galant, Mirage,
Montero, Pickup, Precis, 3000GT
IDENTIFICATION
MITSUBISHI AUTOMATIC TRANSMISSION APPLICATIONS








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Model Transmission/Transaxle
Eclipse
1.8 & 2.0L ........................... Model F4A22 Transaxle
2.0L Turbo ........................... Model F4A33 Transaxle
All-Wheel Drive (AWD) ................ Model W4A33 Transaxle
Galant
AWD .................................. Model W4A32 Transaxle
DOHC ................................. Model F4A22 Transaxle
SOHC ........................ Model KM175 or F4A22 Transaxle
Mirage
1.5L ................................. Model F3A21 Transaxle
1.6L ................................. Model F4A21 Transaxle
Montero ............................ Model V4AW2 Transmission
Pickup ............................. Model R4AC1 Transmission
Precis ................................ Model KM176 Transaxle
3000GT ................................ Model F4A33 Transaxle









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LUBRICATION
TRANSAXLE/TRANSMISSION SERVICE INTERVALS
Check fluid level every 12 months or 15,000 miles. Change
fluid and filter every 30,000 miles. If vehicle is operated under
severe condition, change fluid more often. If severe darkening of
fluid and strong odor are noted, bands should also be adjusted (if
equipped).
TRANSFER CASE SERVICE INTERVALS
On 4WD and AWD models, change transfer case fluid every 30,
000 miles.
CHECKING FLUID LEVEL
TRANSAXLE/TRANSMISSION
1) Park vehicle on level area. Ensure oil is at normal
operating temperature, parking brake is engaged, and engine is at
idle. Move gear selector through each position, stopping briefly in
each position.
2) Place gear selector in Neutral, and clean area around
dipstick tube. Ensure fluid level is between lower and upper marks,
but never over upper mark, in HOT range. Add or drain fluid if
necessary.

CAUTION: If severe darkening of fluid and strong odor are noted,
change fluid and filter, and adjust bands.
TRANSFER CASE (3000GT)
Lubricant level should be approximately .5" (13 mm) below
fill hole on side of transfer case.
TRANSFER CASE (ALL OTHERS)
Lubricant level should be to bottom of fill hole on side of
transfer case.
RECOMMENDED FLUID
TRANSAXLE/TRANSMISSION
Use Chrysler Plus/Mitsubishi Plus ATF, Dexron and Dexron-II
ATF.
TRANSFER CASES
Use SAE 75W-85 gear oil with API GL-4 rating or higher.
FLUID CAPACITY
TRANSAXLE/TRANSMISSION REFILL CAPACITIES








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Refill Dry Fill
Application Qts. (L) Qts. (L\
)
Mirage ..................... 4.8 (4.5) ............... 13.0 (12.2\
)
Eclipse
F4A22 .................... 4.2 (4.0) ................. 6.4 (6.1\
)
F4A33 & W4A33 ............ 6.4 (6.1) ................. 8.0 (7.6\
)
Galant
2WD ...................... 4.8 (4.5) ................. 6.4 (6.1\
)
AWD ...................... 4.8 (4.5) ................. 6.9 (6.5\
)
Montero .................... 5.8 (5.5) ................. 7.4 (7.0\
)
Pickup ................... 2.0 (1.9)( 1) ............... 10.2 (9.7)
Precis ..................... 4.8 (4.5) ................. 6.4 (6.1\
)
3000GT ..................... 4.8 (4.5) ................. 7.9 (7.5\
)
( 1) - Idle engine in Neutral, then add fluid to bring level between
notches at "H" mark.









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TRANSFER CASE REFILL CAPACITIES








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Application Pts. (L)
Eclipse & Galant ............................ 1.3 (0.6)
Mirage ............................................ N/A
Montero & Pickup ............................ 4.6 (2.2)
3000GT ........................................ .6 (.3)









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DRAINING & REFILLING
NOTE: Although manufacturer recommends changing only fluid, the
oil filter/screen may also require replacement. If replacing

oil filter/screen, note length and location of all bolts.
TRANSAXLE (EXCEPT MONTERO, PICKUP & RAM-50)
1) Remove drain plug(s), and drain fluid. See Fig. 1. Some
applications may contain a drain plug located in housing below drive
axle shaft, in oil pan. Remove oil pan. Remove oil filter/screen if
necessary.
2) If oil filter/screen is replaced, tighten bolts to
specification. See TORQUE SPECIFICATIONS table at end of article.
Clean oil pan, replace gasket, and install oil pan. Tighten oil pan
bolts and drain plug to specification. See TORQUE SPECIFICATIONS
table. Ensure dipstick hole area is clean, and pour approximately 4.2
qts. (4.0L) of Dexron-II fluid into dipstick hole.
3) Operate engine at idle for 2 minutes. Shift transaxle to
each position, ending in Neutral. Add sufficient fluid to reach lower
mark. After reaching normal operating temperature, fluid should be
between upper and lower marks of HOT range on dipstick.
Fig. 1: Locating Drain Plugs
Courtesy of Mitsubishi Motor Sales of America.
TRANSMISSION (MONTERO & PICKUP)
1) Remove drain plug (if equipped) from transmission pan, an\
d
allow fluid to drain. On models without drain plug, remove oil pan
must to drain fluid. Remove oil filter/screen if necessary.
2) If oil filter/screen is replaced, tighten bolts to
specification. See TORQUE SPECIFICATIONS table at end of article.
Clean oil pan, replace gasket, and install oil pan. Tighten oil pan
bolts and drain plug to specification. See TORQUE SPECIFICATIONS
table. Fill transmission, through filler tube, with 5.3 qts. (5.0L) of\
Dexron-II ATF on Montero, or 2.0 qts. (1.9L) on all others. Start
engine, and allow to idle for 2 minutes.
3) Shift transmission into each position, ending in Neutral.
Check fluid level with engine running at idle, and add sufficient

fluid to bring level to lower mark of dipstick if necessary. Recheck
fluid level after transmission is at normal operating temperature.
TRANSFER CASE
Drain plug is located on bottom of transfer case. Change
drain plug gasket whenever fluid is changed. On 3000GT, lubricant
level should be approximately .5" (13 mm) below fill hole on side of
transfer case. On all others models, lubricant level should be to
bottom of fill hole on side of transfer case.
HYDRAULIC CONTROL PRESSURE ADJUSTMENTS
LINE PRESSURE CHECK (EXCEPT MONTERO & PICKUP)
1) Set parking brake. Place shift lever in Neutral position.
Attach engine tachometer. Remove line pressure port plug located above
front transaxle shaft, forward of governor pressure port plug. On
Precis, line pressure port is located below bell housing, at front of
transaxle oil pan. Using appropriate adapter, attach pressure gauge.
2) Start engine, and bring to operating temperature. With
gear selector in Drive position, bring engine speed to 2500 RPM. Pull
throttle control cable (if equipped) wide open at transaxle side.
3) Line pressure should be 98-100 psi (6.9-7.0 kg/cm
) on
Mirage, or 124-127 psi (8.7-8.9 kg/cm) on all others. If line
pressure is not to specification, proceed to LINE PRESSURE ADJUSTMENT.
LINE PRESSURE ADJUSTMENT (EXCEPT MONTERO & PICKUP)
1) Drain transaxle fluid. Remove oil pan. Disconnect throttle
control cable from throttle cam. Remove oil temperature sensor (if
equipped). Disconnect solenoid connector. On some models, it may be
necessary to push solenoid wire harness connector and grommet into
transaxle case.
2) Remove oil filter screen and plate. Noting location and
length of bolts, remove valve body. DO NOT drop internal parts. Adjust
line pressure by turning regulator valve adjusting screw.
3) Turn adjusting screw counterclockwise to increase pressure
or clockwise to decrease pressure. One complete turn of adjusting
screw changes line pressure as follows.
* 3.7 psi (.26 kg/cm
) on Mirage with F3A21 Transaxle
* 5.4 psi (.39 kg/cm) on Precis
* 54 psi (3.8 kg/cm) on all others
4) After adjustment, reverse removal procedure to install.
Refill transaxle.
LINE PRESSURE (MONTERO)
1) Remove plug from line pressure take-off port located
behind transmission shift control lever. Install Hydraulic Pressure
Meter (MD998330) with Adapter (MD998206).
2) Place vehicle on dynamometer. Apply parking brake and
start engine. With brake applied, place transmission in Drive. Note
pressure at idle. Pressure should be 74-85 psi (5.2-6.0 kg/cm
).
3) Raise engine RPM to stall speed (2100-2400 RPM). Note lin\
e
pressure. Pressure should be 156-185 psi (11.0-13.0 kg/cm
).
4) Shift transmission into Reverse with brake applied. At
idle, pressure should be 112-130 psi (7.9-9.1 kg/cm
). Raise engine
RPM to stall speed (2100-2400 RPM). Note line pressure. Pressure
should be 227-285 psi (16.0-20.0 kg/cm
). If readings are not to

initially, lock nut and adjustment rod may rotate together.
6) Back off outer section 2-2 3/4 turns. Rotate outer section
to right and inner section to left until inner section is free of lock
nut. Tighten lock nut by hand until it contacts piston. Using torque
wrench, tighten lock nut to 18-23 ft. lbs. (25-32 N.m).
7) Remove adapter and kickdown servo wrench. Install new "O"
ring in groove around switch. Install switch and snap ring.
TRANSMISSION THROTTLE CONTROL
MIRAGE
1) On all other models, ensure throttle lever is in curb idle
position. Engine must be at normal operating temperature.
2) On all models, raise cover "B" of throttle cable upward to
expose nipple. See Fig. 3. Loosen lower cable bracket mounting bolt.
Move lower cable bracket until distance between nipple and top of
cover "A" on throttle cable is .02-.06" (.5-1.5 mm).
3) Tighten lower cable bracket mounting bolt to 108-126 INCH
lbs. (12-14 N.m). With throttle lever in wide open throttle position,
pull cable upward to ensure some cable free play exists.
Fig. 3: Adjusting Throttle Cable (Mirage)
Courtesy of Mitsubishi Motor Sales of America.
CAUTION: On Pickup, always adjust throttle control cable
whenever idle is adjusted.

PICKUP
1) Ensure engine idle is adjusted correctly. Ensure throttle
lever and throttle cable bracket are not bent. Pull lightly on inner
throttle cable.
2) While in closed throttle position, measure gap between
inner cable stopper and outer cable housing. Adjust cable as necessary
to obtain a gap of .031-.059" (.79-1.50 mm). See Fig. 4 (STEP 1).
Fig. 4: Adjusting Throttle Cable (Pickup)
Courtesy of Mitsubishi Motor Sales of America.
3) While holding throttle in wide open position, pull on
inner throttle cable. Adjust bell crank as necessary to obtain a gap
of 1.46-1.50" (37.08-38.10 mm) between inner cable stopper and outer
cable. See Fig. 4 (STEP 2).
4) With throttle fully closed, recheck gap between inner
cable stopper and outer cable housing. Gap should be .031-.059" (.79-
1.50 mm). See Fig. 4 (STEP 3). While holding throttle in wide open
position, pull on inner throttle cable. Check for a gap of 1.30-1.38"
(33.02-35.05 mm).
Montero Ensure throttle lever and throttle cable bracket
are not bent. Ensure distance between inner cable stopper end and dust
cover is 0-.04" (0-1.0 mm). See Fig. 5.
Fig. 5: Adjusting Throttle Cable (Montero)
Courtesy of Mitsubishi Motor Sales of America.
SHIFT LINKAGE

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TR O UBLE S H O OTIN G - B ASIC P R O CED URES

1991 M it s u bis h i M onte ro
GENERAL TROUBLE SHOOTING
* PLEASE READ THIS FIRST *
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.
ACCESSORIES & ELECTRICAL
CHARGING SYSTEM 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.
BASIC CHARGING SYSTEM TROUBLE SHOOTING CHART









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CONDITION POSSIBLE CAUSE CORRECTION








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Vehicle Will Not Dead battery Check battery cells,
Start alternator belt
tension and alternator
output
Loose or corroded battery Check all charging
connections system connections
Ignition circuit or switch Check and replace as
malfunction necessary









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Alternator Light Loose or worn alternator Check alternator drive
Stays On With drive belt tension and
Engine Running condition, See Belt
Adjustment in TUNE-UP
article in the
TUNE-UP section
Loose alternator wiring Check all charging
connections system connections
Short in alternator light See Indicator Warning
wiring Lights in STANDARD
INSTRUMENTS in the
ACCESSORIES &
EQUIPMENT section
Defective alternator stator See Bench Tests in
or diodes ALTERNATOR article
Defective regulator See Regulator Check in