The timing in a Saturn is not adjustable. The ignition timing is computer controlled by the Ignition control module located underneith your coil packs. if there is an issue with engine valve timing, you must replace all timing components, ie... timing cam gears, crank gear, hydralic tentioner and guides.
It has a spring loaded tensioner. No adjustment is possible as the tensioner constantly adjusts tension. If tension is incorrect, the tensioner must be replaced.
If you checked the belt and you think it is loose ,change it. It has a tensioner built in that sets the tension when the belt is installed.
The alternator is rotated on it's pivot to adjust belt tension.
You may need to adjust the tension on the belt.
Adjust it.
Loosen the alternator tensioner bolt. You will be able to slide the alternator either way to adjust the tension on the belt.
If it is a drive belt and not a serpentine belt is has no tensioner. You manually adjust the tension by normally adjusting tension by moving the alternator. Loosen to bolts holding the alternator in place and then adjust the tension. Tighten the bolts when the tension is right. If it is serpentine belt if you follow the belt around the the engine you will see the tensioner.
There is no way to adjust the belt tensioner, if it's not keeping enough tension on the belt the complete tensioner itself will need replaced.
you do not adjust tension on a serpentine belt the tension is automatcally adjusted if the belt is loose, replace the belt SOME TIMES THE TENSIONER CAN BE WEEK ALSO.
You'll find an idler/tensioner pulley, which rides on an adjustable arm. First you have to loosen the locknut(14mm?) of the pulley , then tighten/loosen the adjuster rod (8mm?) to adjust the belt tension. Afterwards, tighten the locknut.
There is no timing belt. Saturn Ion's use a timing chain.
If it is a serpentine belt, the tension is automatically adjusted by the tension idler. If the belt is loose then the tensioner needs replacing. If it is a normal drive belt, then the alternator is mounted on a slotted bracket that allows you to adjust the position of the alternator. You can loosen the bolts and adjust the tension on the belt.
Apply a wrench to the center bolt on the pully and turn it will adjust the tension.