Synchronizer Rings 3RD To 6TH Gear, Checking For Wear

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NOTE:

Check the spline camber synchronizer ring from the locking collar/synchronizer ring and gear wheel and the synchronizer spring -arrow- in the gear wheel for damage if there is >>scraping<< during a synchronization process of a gear. Replace damaged components.. Refer to GENERAL REPAIR INFORMATION - "Damage on the selector gears and locking collars" (See illustration 13).

Fig 1: Inserting Spring Into Gear

Courtesy of AUDI OF AMERICA, LLC

When doing this, the clutch mechanism, the clutch and the selector mechanism adjustment must be OK

Check the molybdenum and carbon coated synchronizer rings.

Fig 2: Synchronizer Rings Coated With Molybdenum Grease -I- Or Coated With Carbon -II-

Courtesy of AUDI OF AMERICA, LLC

Clean the synchronizer ring. There must not be any oil on the friction surface.

I - Synchronizer rings coated with molybdenum grease

The friction surface of a intact molybdenum coated synchronizer ring looks graphite gray and slightly porous.
Replace the synchronizer ring if the friction surface has shiny spots -A- or if the brass color base starts to show through.

II - Synchronizer rings coated with carbon

Check the synchronizer rings coated with carbon friction surfaces -B- for damage (flat areas, disintegrating areas or carbon layer). if necessary replace.