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I appreciate the info Retiredwarhorses! Just didn’t know if it was something I needed to look into or not especially since it’s not constant.

Also my 6.5 is a serpentine setup so what you said Action makes sense.

Okay I guess I really never noticed it but yes it does slow down a little after I turn it off and then the clunk happens. Here’s a video. Thanks for any input you all!

I will try to take a video of it and post if so you all can hear it. It sounds kind of like a piston kind of clunk. My hmmwv runs perfectly other than this noise

The pulley that is connected to the crankshaft right in front of the harmonic balancer. It won’t move in any way except like trying to twist it clockwise or counter clock wise. I will definitely look at the other accessory drive pieces and see if any bolts are loose or anything. As far as engine...

So when I shut my engine off I get a pretty loud clunk noise. I read some posts saying that it’s the crank puller or harmonic balancer. Well my crank pulley rubber is in great shaped with no cracks and I can barely move it at all when the engine is off. Like maybe a 1/4 of an inch. I don’t know...