4.0l Engine Timing Chain Tensioners, Replacement Schedule

[410Fortune]

I’m not worried about it hahahaha run what works for you

 

[ExplorerRider]

Other's here have said to replace them at 75K. You need to be aware that if your guides are already broken, removing the old tensioners can cause things to fall apart. The tensioners are a bad design, but the guides and cassettes are what eventually do you in.

So if I ordered the two external tensioners for my '05 Explorer w/4.0L V6 that still runs quietly when I start it, I might ought to just let them be?