you dont they are self adjusting with the tentioner pully...
Replace tentioner pully on 2.8 multiport
TAKE TIRE TOOL AND PRY TENTIONER UPWARDS TAKE SERPENTENE BELT OFF REMOVE TENTIONER PULLY PUT NEW ONE ON PUT NEW BELT ON SPEC SHOULD BE ON THE HOOD OR THE NEAR THE RAIDIATOR PRY PULLY BACK UP SET BELT
get a 1/2 drive rachet and a socket that fits the tentioner pully hand pull the pully to slack the belt pull the belt off and let the pully back in placethen you can loosen the nut ans tap the pully off if needed
I Have 94 Probe 4 cylinder that squealed when I started it. the pully on the water pump was lose
Apply a wrench to the center bolt on the pully and turn it will adjust the tension.
timing chains don't squeal, they rattle and growl. the serpentine belt may squeal if the belt is worn. to check for a worn belt, locate the belt so that you can see the ribbed side clearly. anymore then 5 cracks per inch on any one of the ribs is considered worn and should be replaced. if the ribbed side is in good shape, the flat side should be examined. it should be dull in appearance. If the belt is shiney it should be replaced. recommended replacement on a serpentine belt is every 40-60k miles. if you are in this range, or passed it, and havent replaced the belt, now is the time to do it. serpentine belts can stretch over time. Another cause of a squeal may be a faulty pully someware on the engine. mostly the Idler pully, located just under the motor mount, or the belt tentioner pully, or the belt tentioner assembly as a whole, located just down and to the left from the idler pully. Easy way to check belt tention is to locate the portion of the belt running from your air conditioner to the idler pully, using two fingers, press down on the belt with some force. if your belt tentioner moves more then 1/4 of an inch its time to replace it.
make sure you have a belt routing label attached to under side of hood.in the center of engine behind the fan there is a belt tentioner pully should be 15mm take a socket and braker bar turn the pully bolt to the right remove&replace belt very easy.
CHECK THE IDELER PULLY OR BELT TENSIONER PULLY.
there is no adjustment as it as already as a pully that does that, unless yours is seized or stuck.
Suggestion: check the belt tentioner pully, if that's o.k. then try the fan clutch. i have a 2004 escape that did same thing it was due to having low power steering fluid
Check the allignment of all the pully's.