"Grinding" turbocharger noise on shutdown

[W4RLR]

My truck has been trouble free, and I hope it remains so, but there is a noise that I noticed last month that has become more pronounced in the last few weeks. On shutdown, there is a sound similar to a grinding or a bearing noise that winds down and then stops. The obvious source would be the turbocharger, and I do hear this noise from the rear of the truck near the tailpipe as well as at the front of the truck. Boost response remains normal. What would cause this, just a normal condition, lack of lubrication, or coking up of the turbo vanes? I only have 18K on the truck, so coking is doubtful. Any ideas? Thanks!

 

[DaveBen]

This is normal. Mine does it. It is the turbo winding down. You are hearing the the shaft spin on the bearing (sleeved).

Dave

 

[W4RLR]

Thought so but wasn't sure. The last turbo vehicle I had didn't make that much racket, but then again the engine wasn't as big (2.3L gasser) Thanks!