Genuine 1994 Audi 100 Drive Belt

1994 Audi 100 Drive Belt Parts and Q&A

• Q: How to fit, remove, and tension the auxiliary drive belt on 1994 Audi 100?

  A: One, two or three drive belts can be fitted depending on the vehicle specification and the type of engine. ADR engines use the crankshaft pulley on the main drive belt to rotate the alternator and power steering pump, and a second drive belt to rotate the coolant pump and the power steering pump. When there is air conditioning, the compressor is also powered by another drive belt other than the crankshaft pulley. ADR engines have ribbed-type main and compressor drive belts and vee-type coolant pump drive belt. In other 4-cylinder engines, the alternator and coolant pump are powered by the primary drive belt, and the air conditioning compressor or power steering pump is powered by another drive belt. They are vee-type drive belts, the air conditioning drive belt tension is set by means of shims and the power steering pump drive belt tension is set by relocating the pump itself. In ADR engines this tension of the main drive belt is automatically adjusted and the coolant pump drive belt tension is not adjusted, the compressor drive belt tension is adjusted with a torque wrench. In other 4-cylinder engines, main drive belt tension is changed by locating the alternator and compressor by attaching shims between the halves of the pulleys. Removal of the drive belts is required and before removing them follow the following steps: first use the handbrake, jack the front part of the vehicle then use the axle stands to hold it. In case the drive belt is to be re-used, label it clockwise. On air conditioned models, a drive belt can be removed by unbolstering the engine front torque arm and removing the drive belt tensioner first. To disassemble the primary drive belt, disengage the automatic tensioner and place it with a special pin, dislodge the drive belt in the pulleys. With the coolant pump drive belt, have the power steering pump pulley fixed in place and undo the bolts that fixed the pulley to the coolant pump and take off the drive belt and half the pulleys. During the refitting, find the coolant pump drive belt on the power steering pump pulley, loosely fit the halves of the pulley, and tighten the retaining bolts gradually and ensuring that the belt does not get trapped. To turn the drive belt, first clock the tensioner clockwise, take out the retaining pin and then release the tensioner to elevate the drive belt on all the pulleys. On cars with air conditioning, find the drive belt on the compressor and crankshaft pulleys, re-fitting the tensioner and hand-tightening the retaining bolts, making sure the drive belt is in position. Apply a given torque on the tensioner body to tighten the drive belt. In non-ADR engines, you need to take the air conditioning compressor drive belt off, in which case you must keep the stationary pulley in place and unscrew the bolts to take the drive belt and the halves of the pulley. In the case of power steering pump drive belt, the pump mounting bolts must be loosened and the pump shifted in the direction of the crankshaft pulley to slide the drive belt off. In order to remove the main alternator/coolant pump drive belt, loosen the alternator mounting and adjustment link bolts and reposition the alternator back along the adjustment rack to allow the drive belt to slide off. Find the main drive belt on the pulleys when refitting and screw the adjustment bolt so that the belt stays in place. The drive belt may be tensioned in two ways, the first one being by adjusting the tensioner rack nut until the deflection of the drive belt is about 2.0 mm when using a new belt or 5.0 mm when using a used belt, then tensioning the lock bolt and other bolts; the second one is to use a torque wrench to tighten the tensioner rack nut to a given value when using a new or used belt respectively, keeping the location of the alternator constant.