OVERVIEW - BELT PULLEY, "Sanden" A/C COMPRESSOR

-- Perform the preparatory work. Refer to PRELIMINARY WORK FOR REPLACING BELT PULLEY .

Fig 1: Belt Pulley Exploded View

Courtesy of AUDI

1. Nut
   • 25 Nm
   • To protect the A/C compressor input shaft threads, they may be covered with a plastic cap (the plastic cap is not illustrated).

     -- Hold the belt pulley securely with a commercially available oil filter band wrench to loosen and tighten the hex nut.

     -- The threads of the nut that was installed with locking fluid must be cleaned (for example, using a thread tap). Otherwise, there is a risk that the input shaft will break off during assembly.

     -- Clean the threads of the A/C compressor input shaft with a wire brush.

     -- Insert the nut with locking compound. Locking fluid. Refer to the appropriate Parts Information.

2. Bolt
   • 12 Nm

     -- Hold the belt pulley securely with a commercially available oil filter band wrench to loosen and tighten the bolts.

     -- The threaded holes into which the self-locking bolts or bolts with locking fluid are installed must be cleaned (for example with a thread tap). Otherwise, there is a risk that the bolts break off during assembly.

     -- Clean the threads of the bolts that were installed with locking fluid using a wire brush. Then insert the bolts with locking fluid. Locking fluid. Refer to the appropriate Parts Information.

3. Drive Plate
   • With overload protection (securing spring elements); is activated when the torque is too great (for example, if the A/C compressor runs with resistance) and the belt pulley runs freely without driving the A/C compressor.
   • The drive plate spring elements dampen vibrations and noise
4. Circlip
   • Always replace
   • Install on the proper side, beveled insertion edge -A- faces away from the A/C compressor; flat side faces the A/C compressor
5. Belt Pulley
   • With rubber elements -B- and threaded plates -C- for decoupling the belt pulley from A/C compressor input shaft, dampens vibrations and noises
   • The threaded plates can also be connected to each other by a ring, depending on the version.
   • For "cold climate" vehicles (for example, central and north Europe), A/C compressors with a smaller displacement may be installed. On these A/C compressors, the belt pulley is slightly different from the version illustrated here (the rubber elements -B- are, for example, not present). Refer to Parts Information.
6. A/C Compressor
   • Clean the A/C compressor input shaft before installing the belt pulley