Gap Dimension Between Belt and Clutch Plate, Checking

NOTE:

The gap dimension must be within the permissible range over the entire circumference.

Gap dimension may also be measured with A/C compressor installed.

If the gap dimension is outside of the permissible range, first remove the clutch plate and then remove or insert spacers to get to attain the correct dimension.

-- Turn off the ignition.

-- Perform the preliminary work as for replacing the belt pulley. Refer to PRELIMINARY WORK FOR REPLACING BELT PULLEY .

Tighten the clutch plate -C- on the A/C compressor shaft -E- to 30 Nm.

Fig 1: Identifying A/C Compressor Belt Pulley And Clutch Plate Gap, Checking
Courtesy of AUDI OF AMERICA, LLC

-- Measure the dimension "1" between the belt pulley -B- and the clutch plate -C- with a depth gauge -F- at three places on the clutch plate -C- circumference and then write down the measured values.

-- Apply 12 volts to the 1-pin connector -A-.

-- Connect the ground to the compressor housing -D-.

-- Measure the dimension "2" between the belt pulley -B- and the clutch plate -C- with a depth gauge -F- at three places on the clutch plate -C- circumference and then write down the measured values.

-- Calculate the gap dimension using dimensions "1" and "2".

Gap dimension specified value: 0.4 to 0.6 mm (up to 0.8 mm on an A/C clutch already used).