Any info on recall to repair faulty timing chain tensioners in Single Overhead Cam model Explorer's, I've been told the engine needs to come out to repair it? Is this a common problem and is it possible to do the yourself?

 

There are 2 of these, the front one is on the drivers side in the front and the rear is on the passengers side in the back. I changed mine myself and I only did the front. I bought the part at Ford for around $50.00. Fixed the problem of sounding like a model T........