1991 MITSUBISHI 3000GT Service Manual

DISASSEMBLYREAR AXLE
- Differential Carrier27-29
M27lF- -
inspection Before Disassemblyl Final Drive Gear Backlash(Refer to P.27-26.)l Drive Gear Runout(Refer to P.27-26.)l Final Drive Gear Tooth Contact(Refer to P.27-26.)Disassembly steps
1. Differential cover assembly2.Vent plug
3.Oil seal
4.Snap ring4*5. Side bearing nut4*6. Side bearing outer race7. Differential case assembly4*8. Side bearing inner race4*9. Drive gear (for 4WS)4*10. Drive gear
11. Spring pin (for 4WS)4*12. LSD case (refer to P.2759.)4*13. Self-locking nut14:Washer
4*
4*
4*4*4*
64 111 FO032
15. Drive pinion assembly
16. Companion flange
17. Drive pinion front shim
(for preload adjustment)18. Drive pinion spacer19. Drive pinion rear bearing inner race20. Drive pinion rear shim
(for pinion height adjustment)
21. Drive pinion
22. Oil seal
23. Drive pinion front bearing
24. Drive pinion rear bearing outer race
25. Differential carrier’
SERVICE POINTS OF DISASSEMBLYM27lGBD5. REMOVAL OF SIDE BEARING NUT
Using the special tool, remove the side bearing nut.
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27-30REAR AXLE - Differential Carrier
VlB990811-01
J6. REMOVAL OF SIDE BEARING OUTER RACE
(I) Using a press, push the differential case until it is
pressed against the carrier.
(2) Remove the differential case from the press. Insert two
spacers in diagonally opposed positions between the‘dside bearing outer race to be removed and the inner
race. Using the press again, remove the outer race.
CautionUse care not to drop the side bearing outer race.
NOTE(1) Identify the right- and left-hand side bearing outer
races for correct reassembly.
(2) Use a spacer, approx. 30 mm (I. 18 in.) long, 10 mm
I.39 in.) wide and 1 to 2 mm (.04 to .08 in.) high,
made of copper sheet or the like to prevent damageto the bearing.
8.REMOVAL OF SIDE BEARING INNER RACES / 9. DRIVE
GEAR (FOR 4WS)
Pull out the side bearing inner races by using the special
tools.
10. REMOVAL OF DRIVE GEAR
(I) Make the mating marks to the differential case and the
drive gear.(2) Loosen the drive gear attaching bolts in diagonal
sequence to remove the drive gear.
13. REMOVAL OF SELF-LOCKING NUTUse the special tools to hold the companion flange and
remove the companion flange self-locking nut.
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REAR AXLE - Differential Carrier27-31
Mating marks
MB990339-01
llY175J
1
15. REMOVAL OF DRIVE PINION ASSEMBLY(1) Make the mating marks to the drive pinion and
companion flange.
NOTEMating marks should not be made to the contact
surfaces of companion flange and propeller shaft.
(2) Drive out the drive pinion together with the drive pinionspacer and drive pinion front shims.
19. REMOVAL OF DRIVE PINION REAR BEARING INNER
RACE
Pull out the drive pinion rear bearing inner race by using the
special tools.22. REMOVAL OF OIL SEAL
/ 23. DRIVE PINION FRONT
BEARINGDrive out the drive pinion front bearing from the gear
carrier.
24. REMOVAL OF DRIVE PINION REAR BEARING OUTER
RACE
Drive out the drive pinion rear bearing outer race from the
gear carrier.
INSPECTIONM27lHBBl Check the companion flange for wear or damage.
l Check the oil seal for wear or deterioration.
l Check the bearings for wear or discoloration.
l Check the gear carrier for cracks.
l
Check the drive pinion and drive gear for wear or cracks.l
Check the side gears, pinion gears and pinion shaft for wear
or damage.l Check the side gear spline for wear or damage.
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27-32
REAR AXLE - Differential Carrier
REASSEMBLYM2711- .
1Reassembly steps
**1. Spring pin (for 4WS)l *2. Drive gear (for 4WS)3. Differential carrierl *4. Drive pinion rear bearing outer race**5. Drive pinion front bearing outer race*aDrive pinion height adjustment
6. Drive pinion
7. Drive pinion rear shim
(for drive pinion height adjustment)
8. Drive pinion rear bearing inner race
9. Drive pinion spacer
l *Drive pinion preload adjustment10. Drive pinion front shim
11. Drive pinion assembly
12. Drive pinion front bearing inner race
13. Oil seal
14. Companion flange
15. Washer
16. Self-locking nut
17. LSD case (Refer to
P.27-39.)** 18. Drive gear** 19. Side bearing inner race
20. Side bearing outer race
l *Final drive gear backlash adjustment21. Differential case assembly
22. Side bearing nut
23. Snap ring
** 24. Oil seal
25. Vent plug
26. Differential cover assembly
NOTE*:Tightening torque with oil applied.TSB Revision

REAR AXLE - Differential Carrier
27-33
Lubrication, Sealing and Adhesion Points
L
11lwO.llFOO11
Sealant: 3M AID Part No. 8663 or equivalentllFO032
Adhesive: 3M Stud Locking Part
No. 4170 or equivalent
Spring pinDjive gear
View A
ilA0262llA0261
SERVICE POINTS OF REASSEMBLYM27UBG
1. INSTALLATION OF SPRING PIN (FOR
4WS)
Tap the spring pin into the differential case to the position
shown in the illustration before
press fitting the rear wheel
oil pump drive gear. The notch on the spring pin should bein the position shown in the illustration.
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27-34
REAR AXLE - Differential Carrier
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I1 11AOlOl
MB99Y2232. PRESS-IN OF THE DRIVE GEAR (FOR 4WS)
(1) With the beveled (large) part of the rear wheel oil pump
drive gear at the inner side, press in the drive gear (by
using the special tool) until the drive gear contacts theend surface of the
.differential case.
(2) Check to ensure that the drive gear and the spring pin
are flush.4. INSTALLATION OF DRIVE PINION REAR BEARING
OUTER RACE
/ 5. DRIVE PINION FRONT BEARING
OUTER RACE
Press-fit the drive pinion rear and front bearing outer racesinto the gear carrier by using the special tools.
CautionBe careful not to press in the outer race at an angle.
. DRIVE PINION HEIGHT ADJUSTMENT
Adjust the drive pinion height by the following procedures:
(1) Install special tools and drive pinion front and rear
bearing inner races on the gear carrier in the sequenceshown in the illustration.
NOTE
Apply a thin coat of multipurpose grease to the matingface of the washer of the special tool.
(2) Tighten the handle of the special tool until the standardvalue of drive pinion rotation torque is obtained.
(3) Measure the drive pinion rotation torque (without the oil
seal).
Standard value
Bearing
classificationBearing
lubricationRotation torqueNm (in.lbs.1
INew
None (with0.3 - 0.5rust-prevention oil)(3 - 4)I
New/reused
NOTEGear oil
application0.15 - 0.25
(1 - 2)
(1) Gradually tighten the nut of the special tool while checkingthe drive pinion rotation torque.
(2) Because the special tool cannot be turned one turn, turn it
several times within the range that it can be turned; then,after fitting to the bearing, measure the rotation torque.
L/1 1
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REAR AXLE - Differential Carrier27-35
MB990802-01
(4) Position the special tool in the side bearing seat of the
gear carrier, and then select a drive pinion rear shim of athickness which corresponds to the gap between the
special tools.
NOTEClean the side bearing seat thoroughly.
When selecting the drive pinion rear shims, keep the
number of shims to a minimum.
(5) Fit the selected drive pinion rear shim(s) to the drive
pinion, and press-fit the drive pinion rear bearing innerrace by using the special tool.
. DRIVE PINION PRELOAD ADJUSTMENT
Adjust the drive pinionrotation torque by using the
following procedures:(1) Fit the drive pinion front shim(s) between the drive
pinion spacer and the drive pinion front bearing inner
race.
(2) Tighten the companion flange to the specified torque byusing the tools.
NOTEDo not install the oil seal.
(3) Measure the drive pinion rotation torque (without the oilseal) by using the special tools.
Standard value
Bearingclassification
New
New/reusedBearing
lubrication
None (with-rust-prevention oil)
Gear oil
amlication
Rotation torqueNm (in.lbs.)
0.3 - 0.5
(3
- 4)
0.15 - 0.25
(I - 2)
(4) If the drive pinion rotation torque is not within the rangeof the standard value, adjust the rotation torque by
replacing the drive pinion, front shim(s) or the drive
pinion spacer.
NOTEWhen selecting the drive pinion front shims, if the
number of shims is large, reduce the number of shimsto a minimum by selecting the drive pinion spacers.
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27-36REAR AXLE - Differential Carrier
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.!I Ia
.:...:.:::.:B. . ..i
\Grease
J
11 D55411223(5) Remove the companion flange and drive pinion once
again.
Drive the oil seal into the qear carrier front lip by using_
the special tool.Apply multipurpose grease to the oil seal lip.
(6) Apply a thin coat of multipurpose grease to the
companion flange contacting surface of the washer
before installing drive pinion assembly.
(7) Install the drive pinion assembly and companion flangewith mating marks properly aligned, and tighten the
companion flange self-locking nut to the specified
torque by using the special tools.
(8) Measure the drive pinion rotation torque (with oil seal)
to verify that the drive pinion rotation torque complies
with the standard value.
Standard value
Bearing
classificationBearrng
lubricationRotation torqueNm (in.lbs.)
Nt?WNone (with
0.5 - 0.7rust-prevention oil)(4 - 6)New/reused
Gear oil0.35 - 0.45
application
(3 - 4)If there is a deviation from the standard value, check
whether or not there is incorrect tightening torque of
the companion flange tightening self-locking nut, or
incorrect fitting of the oil seal.
18. INSTALLATION OF DRIVE GEAR
(I) Clean the drive gear attaching bolts.
(2) Use an Ml0 x 1.25 tap to remove the adhesive adhering
to the threaded holes of the drive gear, and then cleanthe threaded holes by applying compressed air.
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