[boosted k20]

easy way to tension belt:
well if u put back on the upper Plastic timing belt cover, u will have to remove it. i think it's held on by two 12 mm bolts. once thats removed, loosen the timing belt tensioner bolt (if u look directly by the tensioner pulley, u will see/ feel a rubber plug on the lower timing belt cover. remove this in order to gain access to the tensioner pulley bolt. i think it's a 14mm) look inside by the timing belt tensioner pulley ( u should be able to see inside there now since u removed the upper timing belt cover) and u will see that a spring and a bracket holding this spring is attached to it (i think the bracket is on the tensioner pulley itself. the spring is attached to two places, one on the tensioner pulley and one on the engine itself).take ur long screw driver and pry up on the bracket (the one on the pulley, not the one on the engine) that is holding this spring. you might need a friend to help u out with this (one to pry up on this bracket and one to tighten down the tensioner pulley bolt) pry up on this bracket and feel the tension on the belt. the more u pry on it the more tension the belt will have. if u have too much tension, just hold less pressure on the flathead screw driver. once the belt has a decent tension (enought that when u push on it from the exhaust side of the belt) it deflects a little bit. not too much and not too tight; about 1/2" deflection. now keep the screw driver in that position and tighten up the tensioner pulley bolt

it may sound confsuing but when u look at it it's very simple