i have a problem with the tension on my vacuum pump its too loose and there seems to be no way to do it its a nissan almera 2.2 diesel and the year is 2004
if theres no obvios adjuster may be the pully its self is the adjuster if you can take the pully apart in 2 halfs theres somtimes disks/shims to remove in the middle to close up the " V " thereby tightening the belt, or is the belt simply worn thin not easy to see unles you hav a comparison belt.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.