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Dismantling and assembling input shaft - assembly sequence > < Allocation of 3rd - 6th gear synchro-rings to locking collars

A4 Mk3

Checking 3rd - 6th gear synchro-rings for wear
Checking 3rd - 6th gear synchro-rings for wear
  Note
   
t  If the synchromesh of one of the gears makes a grinding noise when engaging the gear, check the synchro-ring, the dog teeth of the locking collar/synchro-ring and the selector gear → Anchor and the synchro-spring -arrow- in the selector gear for damage. Renew damaged parts.
t  The clutch and clutch actuator mechanism must be OK and the selector mechanism must be correctly adjusted.
  V35-1036
Checking synchro-rings with molybdenum coating and carbon coating
Clean synchro-ring; the friction surface must be free of oil.
I - Molybdenum-coated synchro-ring
t  The friction surface of an intact molybdenum coated synchro-ring has a graphite-grey, slightly porous appearance.
t  The synchro-ring must be renewed if very shiny areas -A- have formed on the friction surface or if the brass-coloured metal underneath is already visible.
II - Carbon-coated synchro-ring
t  Check the friction surfaces -B- of carbon-coated synchro-rings for damage (flattened sections or particles of carbon coating broken away). Renew if necessary.
  A34-11012

Dismantling and assembling input shaft - assembly sequence > < Allocation of 3rd - 6th gear synchro-rings to locking collars