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Replacing Your Audi A4 Accessory Belt
 
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Pelican Technical Article:

Replacing Your Audi A4 Accessory Belt

Steve Vernon

Time:

1 hour1 hr

Tab:

$16

Talent:

**

Tools:

17mm wrench

Applicable Models:

Audi A4 (2002-05)
Audi A4 Cabriolet (2003-06)

Parts Required:

New accessory belt

Hot Tip:

Don't work on a hot engine

Performance Gain:

Wont leave you stranded at the side of the road

Complementary Modification:

New belt tensioner

There are two belts on the Audi A4 1.8 liter engine: the timing belt and the accessory or drive belt. Both belts have tensioners and idler pulleys that are used to keep the belts under a constant tension and running straight over the accessory pulleys. This article will deal with the drive or accessory belt repair and maintenance.

The drive belt is mounted on the front of the engine and is turned by a pulley on the end of the crankshaft. This belt is responsible for running the power steering pump, A/C and alternator.

Failure of this belt can leave you stranded. You should check your drive-belt every six months for wear, cracking, fraying, delaminating and drying out and replace it at the first signs of trouble. The belt is not expensive but can leave you stranded at the side of the road if you try and "get a little more life out of it". I always recommend buying two belts and carting the extra in the trunk of your car so even if the belt fails you will not be stranded somewhere waiting for a replacement.

Let the car cool so you don't have to work around a hot engine.

The belt and tensioner are located at the front of the engine.
Figure 1

The belt and tensioner are located at the front of the engine. There is very little room to work but if you take your time you can change the belt out without moving the lock carrier to the service position. If you have really large hands or just want more room to work you can move the lock carrier into the service position; just be aware that this will add substantial time to the job. Please see our article on removing the front bumper and moving the lock carrier for additional information. Note: we moved the carrier to the service position for photographic purposes. You can see in the image the tensioner (red arrow) and the alternator (yellow arrow).

You will need to take the tension off of the tensioner to change belts.
Figure 2

You will need to take the tension off of the tensioner to change belts. The tensioner has a "nub" on the top outer portion. You can place a 17mm wrench (red arrow) on this and turn it clockwise. You can now slip the belt off or lock the tensioner in the open position.

Turn the tensioner all the way clockwise and insert a retaining pin between the rotating part and the tensioner base through the locking hole (red arrows).
Figure 3

Turn the tensioner all the way clockwise and insert a retaining pin between the rotating part and the tensioner base through the locking hole (red arrows). If you do not have a retaining pin you can use a 5mm Allen key.

With the tensioner locked you can slip the old belt off and install the new belt.
Figure 4

With the tensioner locked you can slip the old belt off and install the new belt. The new belt will be a tighter fit so you may have to use the 17mm wrench and pull back on the tension as far as possible to get the new belt on. This diagram shows you the proper routing of the belt with the tensioner indicated by a red arrow. Installation is the reverse of removal. Do not forget to check that the belt is sitting fully in the groves of each pulley.







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