How to Install the Timing Belt in a 1993 Audi 100


1. Fit the appropriate socket onto the bolt in the center of the accessory drive belt tensioner. Rotate the tensioner away from the belt to loosen the belt tension. Lift the belt off the pulleys. Remove the belt tensioner, using the appropriate socket. Unclip the left and right timing belt covers.
2. Turn the crankshaft clockwise until the timing mark on the crankshaft pulley lines up with the mark at the 12 o'clock position. The large holes in the camshaft sprockets should be facing each other -- the left sprocket's hole -- as you are looking down at the engine -- should be at 3 o'clock, and the right sprocket's hole should be at 9 o'clock.
3. Unplug the crankshaft position sensor. Remove it, using the appropriate socket. Screw crankshaft holding tool No. 3242 into the crankshaft sensor hole and tighten it lightly. Remove the crankshaft damper bolts, using the appropriate socket. Pull the crankshaft damper off -- you do not have to remove the large center bolt to get the crankshaft damper off.
4. Remove the lower timing belt cover, using the appropriate socket. Loosen the retaining bolts on both camshafts, but do not remove them. Loosen the timing belt tensioner bolt, then turn the tensioner pulley counterclockwise to remove tension from the timing belt. Tighten the bolt to hold the tensioner in place. Lift the timing belt off the pulleys.
5. Ensure that the camshaft sprockets can turn or taper but that they are not loose enough to tilt. Install the timing belt over the camshaft sprockets. Install camshaft holding tool No. 3243 in the large holes on the camshafts. The tool spans the space between the two camshafts.
6. Slide the belt under the water pump pulley, which is between the camshaft sprockets. Route the belt behind the guide pulley, which is under the right camshaft sprocket, as you are looking down at the engine. Route it around the crankshaft pulley, then behind the tensioner pulley.
7. Turn the tensioner pulley clockwise with an 8 mm Allen wrench until the belt can be twisted 90 degrees with your thumb and forefinger halfway between the left camshaft pulley and the water pump pulley. Tighten the tensioner bolt to 33 foot-pounds of torque. Tighten the camshaft sprocket bolts to 52 foot-pounds of torque. Remove the crankshaft and camshaft holding tools.
8. Reinstall the crankshaft damper, ensuring that the notch is lined up with the tab on the crankshaft sprocket. Install the rest of the parts in reverse order of removal. Install the crankshaft damper bolts and tighten them to 18 foot-pounds of torque. Reinstall the accessory drive belt.