OVERVIEW - BELT PULLEY, SANDEN ("Delphi/Mahle") A/C COMPRESSOR

WARNING: This page is about a different variant/trim than selected.

NOTE:

If the belt pulley overload protection is triggered, check the A/C compressor for ease of movement before replacing the belt pulley. If the A/C compressor creates friction, replace it completely.

The function of overload protection for pulley is described in, for example, the appropriate service information

The A/C compressor can be removed and installed at the bracket on engine without opening the refrigerant lines.

The belt pulley on the "Delphi/Mahle" A/C compressor version "1" is currently identical in construction to the belt pulley on the "Sanden" A/C compressor, version "2". However, the drive plate is secured with a self-locking bolt (-item 2-) to the A/C compressor shaft.

Removing and reinstalling the belt pulley on the "Delphi/Mahle" A/C compressor version "2". Refer to BELT PULLEY, REMOVING AND INSTALLING, "Delphi/Mahle" A/C COMPRESSOR

Belt Pulley Version "1"

Fig 1: Belt Pulley, Sanden A/C Compressor Exploded View

Courtesy of AUDI OF AMERICA, LLC

Hex Nut
- 25 Nm
  -- To loosen and tighten hex nut, hold the belt pulley firmly in place using a commercially available strap wrench (with cloth tape).
  
  -- The thread of the nut, which was installed with locking compound, 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 Parts Information.
Bolts
- 4.5 Nm
  -- Hold the belt pulley securely with a commercially available strap wrench (with cloth tape) to loosen and tighten the bolts.
  
  -- The threaded bolt holes, into which the self-locking bolts or bolts with locking compound were 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 Parts Information.
Drive Plate
- With overload protection; 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.
- With a rubber element for decoupling the belt pulley from the A/C compressor input shaft, the rubber element dampens vibrations and noises.
Washer
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
Belt Pulley
A/C Compressor
- Clean the A/C compressor input shaft before installing the belt pulley

Belt Pulley Version "2"

Fig 2: Belt Pulley Exploded View

Courtesy of AUDI OF AMERICA, LLC

Nut
- 25 Nm
  NOTE:
  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 Parts Information.
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 Parts Information.
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
Circlip
- Replace
- Install on the proper side, beveled insertion edge -A- faces away from the A/C compressor; flat side faces the A/C compressor
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
  NOTE:
  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.
A/C Compressor
- Clean the A/C compressor input shaft before installing the belt pulley