Assembly
Part 1 Of 2:
Part 2 Of 2:
ASSEMBLY
LUBRICATION AND ADHESIVE POINTS
ASSEMBLY SERVICE POINTS
>>A<< OIL SEAL PRESS-FITTING
Use special tools MB990938 and MB991380 to press-fit the oil seal.
>>B<< DRIVE PINION REAR BEARING OUTER RACE PRESS-FITTING
Use special tools MB990938 and MB990938 to press-fit the drive pinion rear bearing outer race.
>>C<< DRIVE PINION FRONT BEARING OUTER RACE PRESS-FITTING
Use special tools MB990938 and MB990934 to press-fit the drive pinion front bearing outer race.
>>D<< DRIVE PINION HEIGHT ADJUSTMENT
Adjust the drive pinion height by the following procedures:
1. Apply multipurpose grease to the washer of special tool MB990903.
2. Install special tools MB990903 (MB990901) and MB991366 (MB991378), drive pinion front and rear bearing inner races to the differential carrier as shown in the illustration.
CAUTION: There should be no gear oil adhered to the bearing.
3. Tighten the nut of special tool MB990903 a little at a time, while measuring the turning torque of the drive pinion. Then confirm that the turning torque (without the drive pinion oil seal) is at the standard value.
Standard value
NOTE: 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 turning torque.
4. Clean the side bearing seat of the differential carrier and bearing caps.
5. Place special tool MB990392 in the side bearing seat of the differential carrier, and position the notch as shown in the illustration. Then install the bearing caps.
6. Use a feeler gauge to measure the clearance (A) between special tools MB990392 and MB990836.
7. Remove the bearing caps and special tools MB990392 and MB990836.
8. Use a micrometer to measure the shown dimensions (B, C) of special tools MB990392 and MB990836.
9. Install the bearing cap, and then use a cylinder gauge to measure the inside diameter (D) of the bearing cap.
10. Calculate thickness (F) of the required drive pinion rear shim by the following formula. Select a shim which most closely matches this thickness.
F = A + B + C - 1/2D - 86.00 mm (3.385 inches)
11. Fit the selected drive pinion rear shim(s) to the drive pinion, and press-fit the drive pinion rear bearing inner race by using special tool MB990728.
>>E<< DRIVE PINION TURNING TORQUE ADJUSTMENT/OIL SEAL INSTALLATION
Adjust the drive pinion turning torque by the following procedures:
1. Insert the drive pinion into the differential carrier, and then install the following parts in sequence from the carrier rear side: drive pinion spacer, drive pinion front shim, drive pinion front bearing inner race and companion flange.
NOTE: Do not install the oil seal.
2. Tighten the companion flange self-locking nut to the specified torque while holding the companion flange with special tool MB990850.
Tightening torque: 186 ± 29 Nm (137 ± 21 ft. lbs.)
CAUTION: There should be no gear oil adhered to the bearing.
3. Use special tools MB990685 and MB990326 to measure the drive pinion turning torque (without the drive pinion oil seal).
Standard value
4. If the drive pinion turning torque is not within the standard value, adjust the turning torque by replacing the drive pinion front shim(s) or the drive pinion spacer.
NOTE: When selecting the drive pinion front shims, if the number of shims is large, reduce the number of shims to a minimum by selecting the drive pinion spacers. Select the drive pinion spacer from the two types shown.
5. Remove the companion flange and drive pinion again. Then insert the drive pinion front bearing inner race into the differential carrier. Use special tool MB990727 to press-fit the drive pinion oil seal.
6. Install the drive pinion assembly and companion flange with the mating marks properly aligned. Tighten the companion flange self-locking nut to the specified torque while holding the companion flange with special tool MB990850.
Tightening torque: 186 ± 29 Nm (137 ± 21 ft. lbs.)
7. Use special tools MB990685 and MB990326 to measure the drive pinion turning torque (with drive pinion oil seal) to verify that the drive pinion turning torque complies with the standard value.
Standard value
8. If the turning torque is not within the standard value, check the tightening torque of the companion flange self-locking nut, and the installation of the oil seal.
>>F<< DRIVE GEAR INSTALLATION
1. Clean the drive gear attaching bolts.
2. Remove the adhesive adhered to the threaded holes of the drive gear by turning the tap (M10 x 1.25). Clean the threaded holes by applying compressed air.
3. Apply 3M stud locking adhesive 8730, 8731 or equivalent to the threaded holes of the drive gear.
4. Install the drive gear onto the limited slip differential case with the mating marks properly aligned. Tighten the drive gear attaching bolts to the specified torque in a diagonal sequence.
Tightening torque: 84 ± 4 Nm (62 ± 3 ft. lbs.)
>>G<< DIFFERENTIAL SIDE BEARING INNER RACE INSTALLATION
Use special tool MB990728 to press-fit the differential side bearing inner races into the differential case.
>>H<< BEARING CAP INSTALLATION/FINAL DRIVE GEAR BACKLASH ADJUSTMENT
Adjust the final drive gear backlash by the following procedure:
1. Assemble the differential case with the side bearing outer race to the differential carrier.
2. Press the differential case to one side to measure the clearance of the side bearing outer race and the differential carrier.
3. Select two pairs of side bearing spacers. Determine the thickness by adding 1/2 of the clearance to the pre-load 0.05 mm (0.002 inch).
4. Remove the side bearing by using special tools MB990810 and MB990811.
NOTE: Hook the claws of special tool MB990810 with the side bearing inner race by using the notches (two areas) of the limited slip differential case side.
5. Assemble the selected side bearing spacers to each side.
6. Use special tool MB990728 to press-fit the side bearing inner race into the limited slip differential case. After installing the outer race, assemble the limited slip differential case to the differential carrier.
7. Align the mating marks of differential carrier and the bearing cap with each other and tighten the bearing cap attaching bolts to the specified torque.
Tightening torque: 37 ± 2 Nm (27 ± 2 ft. lbs.)
8. Measure the final drive gear backlash at four points or more on the circumference of the drive gear.
Standard value: 0.11 - 0.16 mm (0.004 - 0.006 inch)
9. If the backlash is not within the standard value, move the side bearing spacer as shown in the illustration to adjust the backlash.
NOTE: The increment of side bearing spacer must be the same as the decreased amount.
10. Inspect the tooth condition at the final drive gear and replace if required.
11. Measure the drive gear runout.
Limit: 0.05 mm (0.002 inch)
12. If drive gear runout exceeds the limit, remove the differential case and then the drive gears, moving them to different positions and reinstall them.
13. If adjustment is not possible, replace the differential case or drive gear and drive pinion as a set.