If the belt is tight, it is most likely the pulley. You can squirt a little oil around the center bolt, should stop squeaking if pulley bearing is bad.
The belt comes in two sizes 68 and 66.9 (or 67) I got the 68 at first, it was loose and maxed out the tensioner. Get the 67, it's a bit harder to put on but It is the right size for the car. The 68 sucks!
The tentioner should keep the belt at the right tention. Are you sure its the belt? I had some squeaking in my 05' RSX and replaced the Tentioner Pulley and the squeaking went away. Maybe this could be the same case. Hope this helps.
SOURCE: I replaced the serpentine belt on my 2002 accura
I don't Have a manual for this. But in most cases with A serpentine belt the belt trencher is automatic and could be Warren out other then that look see if a pulley bearing could be getting bad .it is also possible you got a defective belt Hope this helps.
Locate the two belts on the left side (passenger side) of your Mitsubishi Lancer. The outer belt is a serpentine belt, operating four pulleys and the inner belt is your alternator belt.
Follow the serpentine (outer) belt to the three pulleys lined up vertically near the front of the engine compartment. Locate the middle pulley, which is the tension pulley for the belt.
Loosen the bolt on the middle pulley with a socket wrench by turning counter-clockwise. Do not remove the bolt, just turn it a couple of times. Loosen the tensioner bolt on the side of the of the pulley, facing the front of the vehicle.
Remove the serpentine belt and then loosen the bolt on the alternator. With the alternator loose, move it forward so that the alternator belt loosens up and then remove belt from the pulleys.
Install the new alternator belt by placing it over both inside pulleys. Tighten the tension on the alternator belt by moving the alternator back and keeping tension on it by holding it back with a long screwdriver. While the alternator belt is tight, use a socket wrench to tighten up the bolt on the alternator.
Place the serpentine belt back on the pulleys and then use a socket wrench on the bolt on the front of the tension pulley. Once the serpentine belt is tight, tighten up the bolt in the middle of the tension pulley.
Start the Mitsubishi Lancer's engine to test the alternator belt and make sure it is working properly. Once you have verified it is working, turn the engine off.
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The belt comes in two sizes... 68 and 66.9 (67) I got the 68 at first..loose and squeeked. then had to get the 67
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