For Reference
S-Series Belt Tensioner Replacement by SATURNFAN wolfman
richpin06a Serpentine Drivebelt Tensioner Removal
Saturn P/N 21485277 Loctite 242® , or equivalent to threads. Torque bolt.

The tensioner assembly's internal parts are not serviceable. To avoid injury,
do not disassemble the tensioner.Caution

Installation of the wood block prior to removing the upper engine torque axis
mount allows the mount to be easily installed without lifting or jacking the powertrain.Important

Depending on the position of the engine to right-hand midrails, the tensioner
can possibly be removed without power steering pump removal.Important
Access and removal of the tensioner can also be completed by removing the
right-hand tire and splash shield.Important
The engine may have to be moved slightly toward the left-hand fender for tensioner
removal. A pry bar can be placed between the steel engine motor mount and frame rail
to move the engine. Do not pry against aluminum engine components or accessories.Important
Refer to Fastener Notice in Cautions and Notices.

Tighten the belt tensioner-to-block 30 N·m (22 lbs ft).
The accessory drive belt tensioner can be installed at 2 different positions.
Correct installation of the accessory drive belt tensioner positions the pulley at
approximately the 3 o'clock position.Important

To prevent engine front cover and mount damage, the three engine mount to engine
front cover nuts must be tightened down uniformly.Notice
Ensure that the belt is properly aligned on the pulleys.Important