Genuine Audi A4 Timing Belt

Audi A4 Timing Belt Parts and Q&A

• Timing Belt
  06C-109-119-C
  Q: What precautions should be taken when working with the Cam Gear and Timing Belt to avoid severe engine damage on Audi A4?

  A:

  This should be done with caution because the timing system is complicated and serious damage to the engine can be caused by any error; it is only highly experienced people who have access to special tools at their disposal and one would be better to consult an expert in case there is any doubt. Always keep both the crankshaft and Camshaft in the same direction, even when timing belt is out, or some damage will be caused to the valves, and only turn the camshaft a little in order to align it. This task requires special tools and one should have them ready prior to the task. To start, the negative battery cable should be removed, then the vehicle raised safely and the drive belt and tensioner then the under-vehicle splash shields and the engine covers should be removed. Install the radiator support panel such that the front of the engine can be reached and this might need to remove the front bumper or the whole radiator support panel so that the engine can be accessed. Disassemble the spark plugs, Valve Covers and power steering pump pulley and remove the crankshaft damper bolts keeping the thrust washer position in mind. Un-bolt the timing belt covers and position the crankshaft pulley mark with the timing cover pointer with the intake and exhaust camshaft lobes fitted properly to cylinder number 3. Install camshaft locking tools, make sure that they are tight, and then take the circlips out of the camshaft sprocket covers and wipe any oil up with a rag. Make the camshaft sprog bolts looser, but do not remove them, unscrew the timing belt tensioner and remove the eccentric pulley bolt prior to removing the timing belt, noting its direction of rotation in case it is to be reused. Check the timing belt and its related components to determine whether they are broken or damaged or contaminated and replace any worn out bits and think about replacing the belt after it has covered over 60,000 miles. When installing, turn the crankshaft manually to test whether it is experiencing any resistance, which is an issue. Install any timing sprockets removed making sure they are capable of rotating without wobbling and fit the timing belt back in place, making sure that it is correctly routed and lined up with the sprockets. Install the eccentric pulley and tension the belt with the help of a torque wrench and make sure that the tensioner is not released. Squeeze the bolts of the camshaft sprocket and fit the sprocket covers using fresh O-rings and circlips. Lastly, install the alignment tools, and the sealing plug in reverse order, again making sure that nothing is interfering with the installation process, by rotating the crankshaft two full times.
• Timing Belt
  06B-109-119-F
  Q: What precautions should be taken when rotating the crankshaft or camshaft with the timing belt removed to avoid valve damage on the Cam Gear and Timing Belt on Audi A4?

  A:

  Exercise care because turning the crankshaft or Camshaft alone with the timing belt loosened may damage the valves, only minimal movement of the camshaft should be done so that the sprocker marks can be aligned. The timing mechanism is complex and error may cause serious engine damages and hence the timing mechanism must be done by experienced persons and all the work must be checked before starting the engine. The steps to follow include disconnecting the negative battery cable, lifting the vehicle in place, and lifting the lower splash shield. To access the engine the radiator support panel must be moved forward by removing the front bumper then the engine cover, the cooling fan, spark plugs and the drivebelt. The drivebelt tensioner and upper timing belt cover are also to be removed and the engine is to be turned to TDC with no. 1 cylinder, making sure that the mark of the camshaft sprocket coincides with the mark of the timing belt cover. Insert an offset box wrench to ensure that the crankshaft does not rotate when the bolts attaching the pulley are loosened and in the event of need, the drive sprocket retaining bolt may also be removed. Disassemble the lower timing belt cover and, as long as you are reusing the timing belt, label the sprocket and direction of the belt. In the case of the 1.8L engine, compress the tensioner pulley and lock it, and loosen the tensioner pulley nut. In case of the 2.0L engine, the loosen nut of the tensioner pulley is rotated counterclockwise to remove the timing belt. Slowly take off the timing belt, ensuring that there is no wear or damage, as well as examine the tensioner pulley and idler wheel to confirm they work smoothly. Check and replace the worn parts and make sure that the belt is not contaminated. The belt should be replaced in case it is questionable or it has covered more than 60,000 miles. Check the crankshaft by hand before turning on the engine to feel whether there is resistance, which means that there might be a problem. Make sure that the crankshaft is at TDC, and put any parts that are taken off back in place, and loop the timing belt over the crankshaft sprocker being careful to align it and stretch it tautly. In the 1.8L engine, the tensioner has to be adjusted and the gap checked whereas in the 2.0L engine, the belt must be laid through the correct path and tension added. Lastly, position the lower timing belt cover and crankshaft pulley and reset the crankshaft to TDC once more and ensure that all alignment marks are properly completed.