1.
Fix the drive gear so it cannot move and measure the final drive gear backlash with a dial indicator.
note
Measure at four points or more on the circumference of the drive gear.
0.08~0.13 mm (0.003~0.005 in.) |
Fix the drive gear so it cannot move and measure the final drive gear backlash with a dial indicator.
Measure at four points or more on the circumference of the drive gear.
0.08~0.13 mm (0.003~0.005 in.) |
If the backlash is beyond the standard value, adjust by using the side bearing spacer.
After adjustment, inspect the contact of the final drive gear.
Place a dial gauge on the back-face of the drive gear and measure the runout.
0.05 mm (0.0020 in.) |
If the runout is beyond the limit, check that there are no foreign substances between the drive gear and differential case and, that the boltsfixing the drive gear are not loose.
If nothing is wrong in check (2), adjust the drive gear depth and remeasure.
If these adjustments are impossible, replace the case or install a new drive gear/drive pinion as a set.
Fix the side gear with a wedge so it cannot move and measure the differential gear backlash with a dial indicator on the pinion gear.
Take the measurements at two places (4 places for LSD) on the pinion gear.
0~0.076 mm (0~0.003 in.) 0.2 mm (0.008 in.) |
If the backlash exceeds the limit, adjust using side bearing spacers.
If adjustment is impossible, replace the side gear and pinion gears as a set.
Apply a thin, uniform coat of machine blue to both surfaces of the drive gear teeth.
Insert a brass rod between the differential carrier and the differential case, and then rotate the companion flange by hand (once in the normal direction, and then once in the reverse direction) while applying a load to the drive gear so that some torque (approximately 25-30 kg●cm) is applied to thedrive pinion.
If the drive gear is rotated too much, the tooth contact pattern will become unclear and difficult to check.
Check the tooth contact pattern.
Standard tooth contact pattern 1. Narrow tooth side 2. Drive-side tooth surface (the side receiving power during acceleration) 3. Wide tooth side 4. Coast-side tooth surface (the side receiving power during coast-down) |  |
Problem | Solution |
Tooth contact pattern resulting from excessive pinion height | |
 |  |
The drive pinion is positioned too far from the center of the drive gear. | Increase the thickness of the pinion height adjusting shim, and position the drive pinion closer tothe center of the drive gear. Also, for backlash adjustment, reposition the drive gear further from the drive pinion. |
Tooth contact pattern resulting from insufficient pinion height | |
 |  |
The drive pinion is positioned too close to the center of the drive gear. | Decrease the thickness of the pinion height adjusting shim, and position the drive pinion further fromthe center of the drive gear. Also, for backlash adjustment, reposition the drive gear closer to the drive pinion. |
Tooth contact pattern is a method for judging the result of the adjustment of drive pinion height and final drive gear backlash. The adjustment of drive pinion height and final drive gear backlash should be repeated until the tooth contact patterns are similar to the standard tooth contact pattern.
When you cannot obtain a correct pattern, the drive gear and drive pinion have exceeded their limits. Both gears should be replaced as a set.
