Synchronizer Rings

WARNING: This page is about a different car, the 2017 Volkswagen GTI, 2016 Volkswagen GTI, 2015 Volkswagen Golf, and 2015 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Synchronizer Rings For Wear

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Do not interchange them. When reusing synchronizer rings, always install on the same gear wheel.
Check for wear and replace if necessary.
Check the grooves -arrow 1- on the synchronizer ring -A- and the inner race for flat areas (grooves are worn).
The coating on the synchronizer rings must not be damaged.
If an intermediate ring -B- is installed, check this intermediate ring on the outer friction surface -arrow 2- and inner friction surface -arrow 3- for >>grooves<<, >>wear grooves<< and >>blue coloring (from overheating)<<.
Check taper of drive gear for >>grooves<< and >>scoring<<.
Coat the synchronizing with transmission fluid and then install.