Hello again, this engine is mounted by several of the Vag Group (Ibiza, Lupo, Polo ..) is in Spanish, on page 19 comes the change of the belt, and if you want (I advise it) Cambo of the tree retain when changing the belt, its measures are 32x47x10 mm (retain oil).
The camshaft is not going to harm the taques, the price of one is over 50 Eur ... imagine changing the eight that carries ... change what is evil can be worth it whenever they do not begin to fail the rest ... that already, to your choice. (They are as you say, in the butt) in the manual describes you how to check them. I do not think it is an injector as they tell you (if it is true that they emit a sound, but it is the solenoid and it is normal, but it does not sound like "diesel"), the ECU does not detect the taque failure, it is a mechanical problem. Greetings!!