Follow the steps in this video (http://www.youtube.com/watch?v=IK_zH8g8Fow) up to removing the housing for the timing gears. It does help to get all the reservoirs out of the way. On my tensioner pulley, there was a cap covering the 14mm nut that prevented me from releasing the tension. Pop that cap...

As a Volvo "newbie" having purchased a high-mileage XC with a number of issues and looking for a repair shop, I saw a recommendation for Fiske Automotive in Lancaster, MA on this site. It was an hour away, but well worth the travel as they checked over the entire vehicle and made necessary...