Gap Dimension Between Belt And Clutch Plate, Checking

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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.

Procedure

Fig 1: Identifying A/C Compressor Belt Pulley And Clutch Plate Gap, Checking

Courtesy of AUDI OF AMERICA, LLC

Tighten the clutch plate -C- on the A/C compressor shaft -E- to 30 Nm, refer to CLUTCH PLATE, REMOVING AND INSTALLING .

-- 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 wire leading to the solenoid coil in the connector -A-.

NOTE:

Depending on the A/C compressor version, the connector -A- can be designed as a 1-pin or 3-pin connector. With a 3-pin connector, both wires to the A/C Compressor Regulator Valve -N280- are housed within the connector. See Fig 1.

There are different versions of the connector -A-. This illustration shows an A/C compressor on which the solenoid coil and the A/C Compressor Regulator Valve -N280- are connected with the vehicle wiring harness via two connectors.

-- 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).