torque MITSUBISHI 3000GT 1991 Manual PDF

REAR AXLE - Service Adjustment Procedures2743
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SERVICE ADJUSTMENT PROCEDURES
REAR AXLE TOTAL BACKLASH CHECKM27FAAG
If the vehicle vibrates and produces a booming sound due to an
imbalance of the driving system, measure the rear axle total
backlash by the following procedures to see if the differential
carrier assembly required removal.
(1) Place the gearshift lever in the neutral position, apply the
parking brake and jack up the vehicle.
(2) Manually turn the propeller shaft clockwise as far as it will
go and make mating marks on the companion flange dustshield and the differential carrier.
(3) Manually turn the propeller shaft counterclockwise as far as
it will go and measure the movement of the mating marks.Limit: 5 mm
(.2 in.)
(4) If the backlash exceeds the limit, remove the differential
carrier assembly and adjust the backlash. (Refer to P.27-26.)
GEAR OIL LEVEL CHECKM27FCAG1. Remove the filler plug, and check the oil level.
2. The oil level is sufficient if it reaches the filler plug hole.
Specified
gear oil:
Hypoid Gear Oil API classification GL-5 or higher
[l.l liter (1.2 q&J]
NOTEAbove -23°C (-10°F): SAE 90,
85W-90, 8OW-90From -34°C (-30°F) to -23°C (-10°F): SAE
8OW, 8OW-90Below -34°C (-30°F): SAE 75W
REAR WHEEL BEARING END PLAY CHECKM27FBAF1. Support the vehicle on axle stands positioned at the
specified locations and remove the rear wheel.
2. Separate the parking brake cable from the rear brake.
3. Remove the caliper assembly and brake disc.
4. Place a dial gauge as shown in the illustration, and then
measure the play when the axle shaft is moved in the axial
direction.Limit: 0.8 mm
(.031 in.)
5.If the play exceeds the limit, check the tightening torque ofthe companion flange of the axle shaft; if it is correct,
replace the wheel bearing.
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27-14REAR AXLE - Service Adjustment Procedures~
Incorrect
llA033CREAR WHEEL BEARING ROTATION TORQUE
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CHECKM27FJAB1. Remove the drive shaft from the companion flange.
2. Remove the brake pad or caliper assembly.
3. Attach a spring balance to the hub bolt, then, pulling the
‘d ’balance at a right angle to the hub bolt, measure the
rotation torque (rotation starting torque) to see whether it iswithin the standard value.
Standard value: 12 N (2.6 Ibs.) [rotation starting torque0.7 Nm (6
in.lbs.)] or less
4. If the rotation starting torque exceeds the standard value,
check the tightening torque of the axle shaft companion
flange. If it is normal, replace the bearing.
LIMITED-SLIP DIFFERENTIAL CHECKM27FlAB
1.Block the front wheels and move the shift lever to neutral.2. Completely release the parking brake.
3. Jack up the rear wheels and place a rigid rack at the
specified part of the side sill.
4. Disconnect the coupling of the differential and propeller
shaft.LJ5. When one wheel is slowly rotated, check whether or not
the wheel on the other side turns in the same direction.
6.If it turns in the opposite direction, replace the viscous unit.
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REAR AXLE - Drive Shaft27-19
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INSPECTIONM27JHAB
lCheck the drive shaft boots for damage or deterioration.l
Check the ball joints for excessive play or check operation.l Check the drive shaft spline for wear or damage.
MB991380llFOO1;
Two-part serration
llAO280
SERVICE POINTS OF INSTALLATIONM27JCAG4. INSTALLATION OF OIL SEAL
(1) If the oil seal is to be replaced because of damage, driveit in by using the special tool.
(2) Apply the specified grease to the oil seal lip.
2. INSTALLATION OF DRIVE SHAFT
CautionI.
Be cautious to ensure that the differential carrier oilseal is not damaged by the drive shaft spline.
2. The right drive shaft for models equipped with the
LSD having a VCU has a two-part serration. Be verycareful to install each one on the correct side.
NOTE
The left and right drive shafts can also be distinguished
from each other by the identification color of boot band
(B.J. side).Drive shaft
LHRH
Boot band (B.J. side)identification colorIWhite
Blue
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CautionBe sure to thoroughly remove any oil or grease, etc.
from the threaded part of the bolt and nut used for
installation to the companion flange, because any oil,
grease, etc. on these parts might cause later looseningeven though tightening is at the specified torque.
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REAR AXLE - Differential Carrier27-27
CT2flG0076
-7(2) Insert a brass rod between the differential carrier and the
differential case, and then rotate the companion flange byhand (once in the normal direction, and then once in the
reverse direction) while applying a load to the drive gear, so
that the revolution torque [approximately 2.5 - 3.0 Nm (28 -33
in.lbs.)] is applied to the drive pinion.
Caution
If the drive gear is rotated too much, the tooth contactpattern will become unclear and difficult to check.
(3) Check the tooth contact condition of the drive gear and
drive pinion.
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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

27-34
REAR AXLE - Differential Carrier
YYW!-01
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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.
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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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\Grease
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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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REAR AXLE - Differential Carrier27-37
III IllFO024
llFO021
When backlash is
1 When backlash is 1
(3) Apply multipurpose adhesive to the threaded holes ofthe drive gear.
Specified adhesive: 3M Stud Locking Part No. 4170or equivalent
(4) Install the drive gear onto the differential case with the
mating marks properly aligned. Tighten the bolts to the
specified torque in a diagonal sequence.
19. PRESS-FITTING OF SIDE BEARING INNER RACE
Press-fit the side bearing inner races to the differential caseby using the special tool.
. FINAL DRIVE GEAR BACKLASH ADJUSTMENT
(1) Using the special tool, temporarily tighten the side
bearing nut until it is in the state just before preloadingof the side bearing.
(2) Measure the final drive gear backlash.
Standard value: 0.11
- 0.16 mm (.004 - .006 in.)
NOTE
Measure at four or more points around the drive gear
circumference.(3) Using the special tool (MB991367 and
MB991385),adjust the backlash to standard value by moving the
side bearing nut as shown.
NOTE
First turn the side bearing nut for loosening, and thenturn (by the same amount) the side bearing nut for
tightening.
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31-1
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WHEEL.I
AND TIRE~
CONTENTSM3IA& -
SERVICE ADJUSTMENT PROCEDURES............4TROUBLESHOOTING:...........................................3
Tire Inflation Pressure Check................................4Bald Spots
Tire Wear Check....................................................4
Cracked Treads
Wheel Runout Check............................................4Feathered Edge
SPECIFICATIONS2Rapid Wear at Center....................................................
General Specifications2Rapid Wear at Shoulders........................................
Service Specifications........................................2Scalloped Wear
Torque Specifications2Wear on One Side............................................