k guys for those who dont want to pay the $400. for the dealer to replace your belt tensioner that "will" come apart if it hasent already out of warrantee, its actually easy if you dont follow the sevice book
from the top of the engine get a 3' bar and push down on the tensioner, then put the pin in to lock it (i made one out of a welding rod) then unbolt it and pull through the bottom of the fan shroud.
bolt the new one on, push down on tensioner again and pull pin thats it your done

A special thanks to Sr Master Tech Rusty for the tips

 

The tensioner comes apart on our engines?

 

when the break, yes they come apart my dealer said they are seeing a rise in broke tensioners

 

new one comes with the lock pin in it already?

Sam

 

yes lockpin in it from ford not sure about a jobber part

 

One more thing to be concerned about!!!

 

just use a nail. works great as a pin.

 

I know this is from a really long time ago but the tensioner on my dads truck started to squeak. I was just wondering if I have to do anything else to replace the tensioner like remove the fan cover/shroud I think thats what its called (the thing that says powerstroke on it) or if it really is as simple as you just put it. This would be a big help! Thanks! On another note it's my first real post!

 

Watch this:
6.4 belt tensioner replacement you tube video - Bing Videos

 

any advance notice its about to die??

squeeking?? noise?? rattle etc???

 

squeaking is the notice.

 

Especially when cold at idle.

 

Do any of you guys that work on them regularly suggest replacing the other a/c belt and tensioner when you replace the primary? Mine has been chirping a little... looked down and saw the body of the primary tensioner is cocked and the belt is riding more foward, so im gnna replace it asap just wondering if i should do the other one while im in there. Thanks

 

Miles and hours on the motor?

 

72,000 miles about 2700 hours last time I checked