no the bolt on the pulley does not need to be loosen just put ur wrench or rachet on the bolt head and turn either way till the pulley moves
By loosening the tension on the alternator nut
replace tension put it on
because it's slipping. tension or replace.
First you need a breaker bar and 19mm socket to fit the "tension bolt". Turn tension bolt clockwise to release tension in order to remove the serpentine belt.
with a 9/16 socket and ratchet
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.
Disconnect the battery.remove the serpentine belt.Unbolt the pulley.
What about this tensioner? How do you remove it, or how do you releave the tension so you can replace the belt?
LOOK! It is right there applying tension to the belt. If you can't find it, then you have no business attempting to replace it.
Loosen bolt in tension pulley, then loosen tension bolt. Replace belt. Tighten tension bolt. Last, tighten bolt through pulley.
Serepentine bels do not have tension adjustments, there is a tension pully That is preloaded with a coil spring in it. If the belt is loose, the pully spring may have lost it tension. Replace the pully assembley.
Regardless of what type of vehicle you have, it is extremely difficult to replace a serpentine belt w/o a serpentine un-tension-er tool. This is a thin, long handle with a socket on the end that sticks out at 90 degrees of the handle. The socket slips onto the bolt-head of the tension-er pulley. Once the serpentine belt is threaded around all the other pulleys you put the un-tension-er tool on the tension-er pulley bolt and pull (or push) to achieve slack in the serpentine belt and slip it on the tension-er pulley.