No its all connected by gears.
Engine code X22DTH This engine is fitted with a timing chain
you cant set the timing its all done within the engine control unit ecu and is done electronically
yes.
Gears
vauxhall vectra 2.2 z22se engine has a chain
This is Not a chain Nor a belt if it is the 2.5TDS. This engine is timed using 'geared pulleys' just like a Gearbox. There is no requirement for adjustment or replacement of anything to do with timing. If it is anything other than this It will more than Likely be a chain if it's diesel or belt if it is the vauxhall petrol engine depending on the size of the engine. I have a 1998 2.5 TDS LWB Frontera which doesn't require either!
Timing marks combo 1,3cdti
It depends on which engine the car has.
Timing belts normally changed every 60,000 miles but if just aquired the car best to get a new one on for peace of mind
2.2dyzelis
yes it has a chain.
It should last the life of the engine and is normally replaced when the engine is overhauled.