The tensioners are the week point.Ford have revised them 4 times.My tensioner let go on the motorway at 80 m.p.h scrapping my engine.Had only done 60,000.
COST ME:
Engine £200
belt + tensioner £70
clutch ,while the box was out £70
fluids £40
And it looked like this
Nearly £400 and that was with me doing all the work myself
Get the belt and tensioner changed ,better safe than sorry