Our 2005 5.9 turbo has developed a little higher whine than normal. Took the cac pipe off and spun the turbo blades and they were semi tight to half way free. After a few turns it loosend up a bit. Started the engine and the blades were still and then slowly started to spin until a full even spin. Check after turning off and still was not a true free spin. There is no loss of power, no oil leaks or smoke. Any ideas? Repairs?

 

Semi tight? Was there any type of rubbing or were they free moving? Check for shaft play up and down and fron to aft. There should be min movement. (1/32 of play and thats about it

 

No sided to side or shaft play. I've spun many turbo blades on new engines and it seemed the same except for being harder to move and a high spot that slowed it down some. It would not freely spin at first. Blades have no pitts, were shinny with a small amount of white / black reidue on them. Once the engne was ran it spun ok. Seemed strange with the engine running at first it was not movng and then in slow motion it geared up.

Is there a cleaner that could be sprayed into the turbo like we use on a throttle body on gas engines?