I have a 1999 Corsa B 1.6i My timing jumped the

What happens when turning car over?

give as much of a description as possible for an accurate reply!

have the OBD codes been read and reset , crank sensor would be my guess but get the OBD checks done

Since you have replaced most of the engine parts I would check you are getting a spark at plugs first and then fuel from pump! I think these are the most probable reasons for not starting!

Check firing order!

with the timing belt off check the water pump make sue it moves round easily if not replace. check the movement of the cams as well. would say it was the water pump at fault. they should be changed at the same time as the belt.

He's just trying to upsell. The pump should have been replaced with the belt last month. I always recommend that if one goes the other should be replaced, for this very reason. Unless the water pump trashed the belt I wouldn't put the timing kit back in it. One month old... There is nothing wrong with them. But again the pump could have ate the belt, check it, if it is chewed up or missing teeth replace the belt only. And he's just giving you a line of ----, for the alignment part.

if jump time that should be it timing marks and the tensioner are to lined up an also install new tensioner and recommend water pump if driven by the timing belt. if it has bent valves cause you jump time usually the car won't trun over at all.

i would take it to a mechanic water pump is behind timing cover

From what you're describing here, the timing belt wasn't installed properly to it's timing marks from the start. You mentioned it ran rough when you got the car back. That immediately told me the timing marks were not correctly lined up. If the belt wasn't tensioned correctly, the belt will gradually start retarding itself to the point of it not running. You did mention that as well already too. In other words, the belt slowly got looser and looser until the valves were not opening/closing at the correct time and eventually the piston hit the valve due to the lack of the tension of the belt not being correct. I really fail to beleive that the tensioner went out "all of a sudden" especially right after the water pump was installed. The reason it is recommended that the timing belt be replaced at the time of the water pump is antifreeze/coolant will SLOWLY deteriorate the belt causing premature wear. This doesn't happen in a week either, this take a long time to happen. My professional opinion is the timing belt was incorrectly re-installed when the water pump was replaced. I've been in the auto repair business for a very long time (28 years) and I have seen this very thing happen when the customer tries to replace the timing belt or water pump themselves especially when there was a lack of experience.

The other mechanic is correct. Your timing belt is due to be replaced. When you have it replaced, make sure you replace the water pump while you're there.