1998 MITSUBISHI LANCER EVOLUTION IV Workshop Manual

MANUAL TRANSMISSION – Transmission Assembly22A-9
REMOVAL SERVICE POINTS
ACLUTCH RELEASE BEARING SEPARATION
(1) Remove the cover from the service hole in the clutch
housing.
(2) While pushing the release fork by hand in the direction
A, insert a flap-tip screwdriver between the release bearing
and the wedge collar.
Caution
Be sure to push the release fork in the direction A
before inserting a screwdriver.
(3) Separate the release bearing from the wedge collar by
prying with the screwdriver (turning the screwdriver grip
90).
NOTE
The release fork is forced to move fully in the direction
B by the return spring as soon as it is separated from
the wedge collar.
Caution
If it is hard to turn the screwdriver (to pry off the
release bearing), remove the screwdriver once and
repeat the above procedure after pushing the release
fork fully in the direction A two to three times. Forcibly
prying can cause the release bearing to be damaged.
BDRIVE SHAFT / DRIVE SHAFT
DISCONNECTION
(1) To disconnect the left-hand drive shaft, insert a lever
as shown and pry out the shaft from the transmission.
To disconnect the right-hand drive shaft, apply a lever
and a hammer as shown and lever out the shaft from
the transfer assembly using the hammer as a fulcrum.
NOTE
Remove the drive shafts with the hub and knuckle
attached.
Caution
Do not attempt to pull out the drive shaft from the
BJ in this stage since it can cause the TJ to be
damaged. Be sure to remove the drive shaft first from
the transmission side using a lever.
(2) Suspend the removed drive shaft with a wire so that
there are no sharp bends in any of the joints.
COUTPUT SHAFT REMOVAL
(1) Use the special tools (MB991612, MB990211) to remove
the output shaft.
(2) Use a shop towel to cover the transmission case not
to let foreign material get into it.
Service hole
Release fork
Wedge collar
Release bearing
Trans-
mission
side
Lever
Projection
Hammer
Lever
Output shaft
Transmission caseMB990211
MB991612

MANUAL TRANSMISSION – Transfer Assembly22A-10
TRANSFER ASSEMBLY
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Transmission Oil Draining and Supplying
(Refer to P.22A-3.)

Transfer Oil Draining and Supplying
(Refer to P.22A-3.)
Front Exhaust Pipe Removal and Installation
(Refer to GROUP 15.)
Gear oil:
MITSUBISHI genuine “Dia-Queen
Super” hypoid gear oil (GL-5)
Unit: Nm {kgfm}
2
69 {7.0}
1
Removal steps

Drive shaft (Refer to P.22A-9.)

Output shaft (Refer to P.22A-9.)
1. Front propeller shaft
(Refer to GROUP 25)
A2. Transfer assembly
REMOVAL SERVICE POINT
ATRANSFER ASSEMBLY REMOVAL
Caution
(1) Use care not to damage the lip of the oil seal in the
transfer case.
(2) Use the special tool to cover the opening in the transfer
case to prevent oil from flowing out or foreign materi-
als from entering the case.
Oil seal lip MB991193

22B-1
MANUAL
TRANSMISSION
OVERHAUL
CONTENTS
GENERAL INFORMATION 2. . . . . . . . . . . . . . . .
SPECIFICATIONS 4. . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 4. . . . . . . . . . . . . .
SEALANTS AND ADHESIVES 5. . . . . . . . . . . .
LUBRICANTS 6. . . . . . . . . . . . . . . . . . . . . . . . . . .
SNAP RINGS, SPACERS AND THRUST
PLATES FOR ADJUSTMENT 6. . . . . . . . . . . . .
TORQUE SPECIFICATIONS 9. . . . . . . . . . . . . .
SPECIAL TOOLS 10. . . . . . . . . . . . . . . . . . . . . .
TRANSMISSION 13. . . . . . . . . . . . . . . . . . . . . . .
INPUT SHAFT 20. . . . . . . . . . . . . . . . . . . . . . . . . OUTPUT SHAFT 27. . . . . . . . . . . . . . . . . . . . . . .
REVERSE IDLER GEAR 35. . . . . . . . . . . . . . .
SPEEDOMETER GEAR 36. . . . . . . . . . . . . . . .
SELECT LEVER 37. . . . . . . . . . . . . . . . . . . . . . .
CONTROL HOUSING 38. . . . . . . . . . . . . . . . . .
CLUTCH HOUSING 41. . . . . . . . . . . . . . . . . . . .
TRANSMISSION CASE 44. . . . . . . . . . . . . . . . .
CENTER DIFFERENTIAL 46. . . . . . . . . . . . . . .
TRANSFER 49. . . . . . . . . . . . . . . . . . . . . . . . . . . .

MANUAL TRANSMISSION OVERHAUL – General Information22B-2
GENERAL INFORMATION
SECTIONAL VIEW – Without Front Limited Slip Differential (Front LSD)

MANUAL TRANSMISSION OVERHAUL – General Information22B-3
SECTIONAL VIEW – With Front Limited Slip Differential (Front LSD)

MANUAL TRANSMISSION OVERHAUL –
Specifications /
Service Specifications22B-4
SPECIFICATIONS
TRANSMISSION MODEL TABLE
Transmission modelGear ratioSpeedometer gear ratioFinal gear ratioFront LSD
W5M51-1-X6AA29/364.529Not available
W5M51-1-X6A1A29/364.529Available
W5M51-1-X7AA30/364.529Not available
W5M51-1-X7A1A30/364.529Available
W5M51-1-Z6AB29/364.875Not available
W5M51-1-Z6A1B29/364.875Available
W5M51-1-Z7AB30/364.875Not available
W5M51-1-Z7A1B30/364.875Available
GEAR RATIO TABLE
AB
1st2.785←
2nd1.950←
3rd1.4071.444
4th1.0311.096
5th0.7610.825
Reverse3.416←
Transfer gear ratio0.3018←
SERVICE SPECIFICATIONS
ItemsAllowable rangeLimit
Input shaft end play mm0.05 – 0.17–
Input shaft front bearing clearance mm0 – 0.12–
Input shaft rear bearing clearance mm0 – 0.12–
Input shaft 5th speed gear clearance mm0 – 0.09–
Output shaft preload mm0.13 – 0.18–
Output shaft bearing clearance mm0 – 0.09–
Output shaft 3rd speed gear clearance mm0 – 0.09–
Center differential case preload mm0.05 – 0.11–
Center differential case pinion backlash mm0.025 – 0.150–
Synchronizer ring back surface to gear clearance mm–0.5

MANUAL TRANSMISSION OVERHAUL – Sealants and Adhesives22B-5
SEALANTS AND ADHESIVES
TRANSMISSION
ItemsSpecified sealants and adhesives
Clutch housing-transmission case mating surfaceTHREEBOND 1216
Control housing-transmission case mating surface
Under cover-transmission case mating surface
Air breatherTHREEBOND 1501
Center differential drive gear boltTHREEBOND 1303 or LOKTITE 648
TRANSFER
ItemsSpecified sealants and adhesives
Air breatherTHREEBOND 1501
FORM-IN-PLACE GASKET
The transmission has several areas where the form-in-place gasket (FIPG) is in use. To ensure that
the gasket fully serves its purpose, it is necessary to observe some precautions when applying the gasket.
Bead size, continuity and location are of paramount importance. Too thin a bead could cause leaks.
Too thick a bead, on the other hand, could be squeezed out of location, causing blocking or narrowing
of the fluid feed line. To eliminate the possibility of leaks from a joint, therefore, it is absolutely necessary
to apply the gasket evenly without a break, while observing the correct bead size.
DISASSEMBLY
The parts assembled with the FIPG can be easily disassembled without use of a special method. In
some cases, however, the sealant between the joined surfaces may have to be broken by lightly striking
with a mallet or similar tool. A flat and thin gasket scraper may be lightly hammered in between the
joined surfaces. In this case, however, care must be taken to prevent damage to the joined surfaces.
SURFACE PREPARATION
Thoroughly remove all substances deposited on the gasket application surfaces, using a gasket scraper
or wire brush. Check to ensure that the surfaces to which the FIPG is to be applied is flat. Make sure
that there are no oils, greases and foreign substances deposited on the application surfaces. Do not
forget to remove the old sealant remaining in the bolt holes.
FORM-IN-PLACE GASKET APPLICATION
Applied FIPG bead should be of the specified size and without breaks. Also be sure to encircle the
bolt hole circumference with a completely continuous bead. The FIPG can be wiped away unless it is
hardened. While the FIPG is still moist (in less than 10 minutes), mount the parts in position. When
the parts are mounted, make sure that the gasket is applied to the required area only. In addition, do
not apply any oil or water to the sealing locations or start the engine until a sufficient amount of time
(about one hour) has passed after installation is completed.
The FIPG application procedure may vary on different areas. Observe the procedure described in the
text when applying the FIPG.

Lubricants / Snap Rings, Spacers
and Thrust Plates for Adjustment MANUAL TRANSMISSION
OVERHAUL –22B-6
LUBRICANTS
TRANSMISSION
ItemsSpecified lubricants
Drive shaft oil seal lip areaDIA QUEEN MULTI-GEAR OIL 75W/85W
(Transmission oil)
Input shaft oil seal lip area
(Transmission oil)
Control shaft oil seal lip area
Select lever shoeMOLYWHITE TA No.1 or No.2
TRANSFER
ItemsSpecified lubricants
Drive shaft oil seal lip areaDIA QUEEN MULTI-GEAR OIL 75W/85W
(Transmission oil)
Front differential oil seal lip area
(Transmission oil)
O-rings
SNAP RINGS, SPACERS AND THRUST PLATES FOR
ADJUSTMENT
Part nameThickness mmIdentification symbolPart No.
Spacer
(For adj stment of inp t shaft end pla )
1.3434MD723600
(For adjustment of input shaft end play)1.4343MD723603
1.5252MD723606
1.6161MD723609
1.7070MD756760
1.7979MD756763
Snap ring
(For adj stment of inp t shaft front bearing
1.43Green (2)MD746708
(For adjustment of input shaft front bearing
clearance)1.51White (2)MD746709
1.59Yellow (2)MD746710
Snap ring
(For adj stment of inp t shaft rear bearing
1.44NoneMD746602
(For adjustment of input shaft rear bearing
clearance)1.51BlueMD746603
1.58BrownMD746604