how can i notice that there is something wrong with turbo??

[blkGSTspider]

what things happen if there is something wrong with turbo??
could find right answer from search
please give me some advise
thx

 

[ddavisaf]

Pull off the intake pipe and check for shaft play. Do this by moving the bearing up and down and side to side. 4 mm or less is perfect. Check for in and out play also, no more than 1 mm.
If you have alot of oil in your LICP and IC then your turbo seal is most likely bad. This is usually accompanied by a loud screeching metal to metal sounds due to the compressor or turbine blades hitting the housing. This sound may come before or after the oil.

 

[boostless05]

if your car sounds supercharged not turbocharged then your turbo is gone bye bye 85% percent of the time