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Servicing screw connections > < Cleaning contact surfaces with contact surface cleaning setVAS 6410

A4 Mk3

Servicing wiring lugs
Servicing wiring lugs
  Note
To prevent the screw connection from cracking when the tightening torque has been exceeded due to a lack of friction in the thread, do not apply rust remover, contact spray or grease to the wiring lugs.
  WARNING
Risk of injury.
Observe warnings and safety regulations → Chapter.
–  Disconnect battery → Electrical system; Rep. gr.27.
   
–  Loosen cap nut and remove wiring lug from screw connection.
–  Check wiring lug for corrosion, dirt, etc.
–  Select appropriate adapter and corresponding sanding pad.
  Note
As an alternative you can also use the sanding block.
  Caution
Increased corrosion due to exposed copper layer.
Do not sand away the tin plating to such an extent that the copper layer underneath becomes visible. Galvanic effects can cause increased corrosion.
  Note
As the thickness of the tin coating varies, it is necessary to clean the wiring lug in several stages and check it in between.
  N97-10788
–  Apply adapter to wiring lug and sand corrosion and dirt off by rotating adapter.
–  Check wiring lug and if necessary re-sand.
–  If necessary, remove sanding residue at wiring lug using deburrer.
–  Screw wiring lug back on to specified torque.
  Note
To ensure optimum contact, tighten all screw-type connections to specified torque after cleaning.
–  Protect connection from corrosion by applying corresponding anti-corrosion agent → Chapter.
–  Re-connect battery → Electrical system; Rep. gr.27.
  N97-10789

Servicing screw connections > < Cleaning contact surfaces with contact surface cleaning setVAS 6410