Important: When replacing the differential ring and pinion set, note that the replacement
drive pinion gear will most likely contain markings on the gear face. These
markings indicate adjustments that need to be made to the shim thickness
as a result of the production tolerances of the gear. The differential drive
pinion gear face contains the following 3 engraved values:
• The CHECK VALUE (1). The check value shows in the hundredths
of a millimeter+22=0.22 mm (0.008 in) how deep the drive pinion
should be installed relative to the drive pinion gear zero line. Compare
this value +0.22 mm (+0.008 in) of the replacement pinion gear
with the value of the original pinion gear, i.e. +0.08 mm (+0.003 in).
Adjust the pinion shim accordingly, which in this case would result in adding
0.13 mm (0.005 in) to the drive pinion shim. Now perform a
tooth contact pattern test. • The PAIRING VALUE (2) for the drive pinion and for the
differential ring gear. This marking is stamped on both the ring gear and
on the pinion gear identifying the pairing as a matched gearset. • The UNDERLINED VALUE (3). The underlined value does not
concern service.
Establishing the differential drive pinion gear depth is initiated by reassembling the differential with the original pinion gear shim that was previously installed and by performing a pattern test. Adjust shim thickness as necessary according to the results of the contact pattern test. Only reuse the shim if it is intact and if it is undamaged. Measure the thickness of the shim if the shim is damaged. Replace the damaged shim with a new shim of the corresponding thickness. Perform the gear tooth contact pattern check when you have assembled the assembly with the original thickness of the shim. Refer to Gear Tooth Contact Pattern Inspection .
