Removing and installing pulley, air conditioner compressor with air conditioning system magnetic clutch N25 — AUDI

🧭 Before you start

Fits: Audi A5 (8T, 2007–2016), Audi Q5 (8R, 2008–2017), Audi A5 Cabriolet (8F), Audi A4 B8 (8K, 2007–2015); platform code 83

• Special tools named: V.A.G 1719/1, puller

📋 Procedure

1. Switch off ignition.
2. Perform preparations for renewing pulley .
3. Remove cap (A).
4. Hold air conditioner compressor drive shaft (B) e.g. with a commercially available hexagon socket wrench (7 mm) and turn clutch plate (C) in direction of (arrow). [Note: The torque for driving the air conditioner compressor is applied to the compressor shaft via the threaded attachment of the clutch plate (C). If the clutch plate (C) has become so firmly screwed onto to the air conditioner compressor shaft (B) that it can no longer be loosened (the 7 mm hexagon flats can no longer transmit the necessary torque), the compressor must be renewed.] [Note: If the pulley (A) cannot be detached by hand from the flange of the air conditioner compressor after removing the circlip (e.g. because of dirt), detach it carefully as described below.If the pulley (A) is supposed to be re-used, the arms of the puller must be applied so that the outside of the pulley is not squashed.]
5. Carefully detach pulley (A) using a puller (with 3 arms) (B). [Note: Do not support spindle of puller (B) on compressor shaft when detaching pulley (A).To support spindle of puller (B) at compressor flange, use a sleeve (C) (e.g. sleeve V.A.G 1719/1 from magnetic clutch pullerV.A.G 1719).After detaching pulley (A), thoroughly clean compressor flange; it must be possible to slide pulley (A) on by hand.] [Note: The gap must be within the permissible range around the entire circumference.The gap can also be measured when the air conditioner compressor is installed.If the gap is outside the permissible range, detach clutch plate and adjust gap to correct dimension by removing or inserting spacers.]

6. Switch off ignition.
7. Perform preparations for renewing pulley .
8. Use a depth gauge (F) to measure dimension "“1”" between pulley (B) and clutch plate (C) at 3 points on circumference of clutch plate (C); note down measured values.
9. Apply voltage of 12 V to 1-pin connector (A).
10. Apply earth to compressor housing (D).
11. Use a depth gauge (F) to measure dimension "“2”" between pulley (B) and clutch plate (C) at 3 points on circumference of clutch plate (C); note down measured values.
12. Calculate gap based on measured values (dimensions "“1”" and "“2”").

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