If you have an owners manual the serpentine belt diagram is in it.
Clockwise to tighten counter clockwise to loosen: http://www.peachparts.com/shopforum/showthread.php?t=129793&highlight=tensioner+turn+direction

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14