I am having a problem removing the Tensioner Pulley bolt. Does anybody know what size the bolt head is? I've tried all of my wrenches and none of them seem to fit right. Will a crows foot wrench fit the bolt head?

I just replaced a tensioner on a windstar today at work, The main bolt holding tensioner to block is 18mm and the pulley bolt is 15mm and it is left hand thread. This is based on being a 3.8 engine

Thaks for the advice. I assumed that it was standard sized not metric.

Assumption is the mother of all foul ups!! ;)