Audi Workshop Service and Repair Manuals > A3 Mk2 > Power unit | 4-cylinder TDI engine (2.0 ltr. 4-valve common rail), mechanics | Enginecrankshaft group, pistons | Cylinder block (pulley end) | Removing and installing poly V-belt - vehicles with air conditioner compressor and tensioning roller

Removing and installing poly V-belt - vehicles with air conditioner compressor and tensioning roller

Removing

–	Remove noise insulation -1- → Rep. gr.50.

Caution

If a used belt runs in the opposite direction when it is refitted, this can cause breakage.

Before removing, mark direction of rotation of poly V-belt with chalk or felt-tip pen for re-installation.

–	Remove tensioning bolt -arrow- and detach tensioning roller to slacken poly V-belt.

–	Take off poly V-belt.

Installing

Installation is carried out in the reverse order; note the following:

Note

t	Renew bolt for tensioning roller.

t	Before fitting poly V-belt, make sure all mechanical units (e.g. alternator and air conditioner compressor) are firmly in position.

–	Fit poly V-belt on all poly V-belt pulleys:

1 -	Vibration damper

2 -	Tensioning roller

3 -	Alternator

4 -	Air conditioner compressor

–	Use a brush to coat guide surfaces of tensioning roller with lubricating paste; lubricating paste → Electronic parts catalogue.

–	Insert tensioning roller with pin into guide on bracket for ancillaries.

–	Tightening bolt for tensioning roller → Fig..

–	Check that end of bolt for tensioning roller protrudes beyond contact surface of tensioning roller as far as dimension -a-.

l	Distance -a- = approx. 2.5 mm.

l	This ensures that the pin is at its limit stop.

–	Start engine and check that belt runs properly.

–	Install noise insulation → Rep. gr.50.

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