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Checking 3rd - 6th gear synchro-rings for wear > < Exploded view - input shaft

A4 Mk3

Allocation of 3rd - 6th gear synchro-rings to locking collars
Allocation of 3rd - 6th gear synchro-rings to locking collars
  Note
t  Depending on the version, the synchro-rings for 3rd/4th gear can have a molybdenum or carbon coating.
t  The synchro-rings for 5th/6th gear always have a molybdenum coating.
t  Please note correct allocation of synchro-rings to locking collars.
   
Different types of synchro-rings
I - Molybdenum-coated synchro-ring
l  Distinguishing features: synchro-ring has oil recesses -arrows-, and friction surface -A- is graphite-grey with a slightly porous appearance.
II - Carbon-coated synchro-ring
l  Distinguishing features: friction surface -B- is black with a porous appearance; upper part is not coated.
  A34-11012
Locking collars for molybdenum-coated synchro-rings → Anchor
I - Locking collar with one groove -arrow- and no chamfers
l  Locking collar -I- – old version, no longer installed
II - Locking collar with chamfers -arrows 1- on both sides of selector fork slot
l  Locking collar -II- – new version, currently installed
  A34-11013
Locking collars for carbon-coated synchro-rings → Anchor
A - Locking collar with two grooves -arrows- and no chamfers
l  Locking collar -A- – old version, no longer installed
B - Locking collar with chamfers on outer sides -arrows 2-
l  Locking collar -B- – new version, currently installed
  A35-10239

Checking 3rd - 6th gear synchro-rings for wear > < Exploded view - input shaft