I need help with Jetta 1.8 2002

I bought a 2002 Jetta which had had a problem with the time band which had burst and enchuedado valves, changed valves and put together, the car did not start, and thought that time was bad, the owners decided to stop mentioning money and sold it to me, thinking that it enching the valves, disarma Car already armed turned on and kept, minutes later a cylinder passed water, I had to disarmed again and because my head occupied welding points and a very mild brush, I decided Seventh the car remained for a while and then turned off from nothing, he did not want to turn on and lost the compression completely, disarmed and only the exhaust valves were chuecas, what I do not understand is why he did it if everything was fine, even when he disarmed the chain I had the 16 points of separation between the trees, I do not know if he has something to do with the oil that is thick for that engine or that it is, someone who is, someone who is, someone who orient me,

I imagine that you are talking about a 2 trees engine with distribution band in a gear and chain of synchronization of trees at the opposite end, is it like that?

If you can put the acronym for the engine, it is better. These could be AWD, AWW or AWP to understand us better.

Yes, that's how double camshaft

Yes, that's how double VWW camshaft

I hope you have changed the monoblock with the same acronyms, the problem will not be, put an email to send you the manual of that engine.
The problem could be in the chain that has been extended, the divers that are carved, an excess of oil pressure, the tensioner of the defective chain or that is too rectified the head.