Originally posted by Pigeon:
The "tool" is a simple 1/2" breaker bar.
Actually, I believe that it is a 3/8".
In my situation, I had to buy three or four different breaker bars before I could find one that would fit into the limited clearance of the wheel well area.
And I can't get to the tensioner from above, I have to remove the RF wheel and splash guard.
As I said before, some model years are easier to work on than others. 
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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