Hopefully i can help..
Going by your description - If the noise emiting from the Turbo housing - it posible the vane shaft has play in it..causing an inbalance from the turbo hence the screaming noise causing the vanes to touch the compressor housing - you need to remove the the intake pipe that leads to the turbo and feel for any excess play movement in the shaft inside the turbo and too it possible check for damage the vanes incase anything was ingested..also ensure the actuator is still able to move on the turbo and hanst jammed or stuck - you should be able to see it move when the engines revved up "vac tube refitted" the actuator will be the part you remove the vac tube from..check the tube isnt damage either or split..i do hope this helps
Is it detrimental to the engine to keep running the vehicle?
Hi..there thanks for your reply..
In a way yes - the turbo essentially creates added boost,power and performance "that kick you get when it increase rpm" on the engine - if the turbo becomes faulty then you wont get that or very little power to be honest/load of smoke out the back in some cases..Its something to certainly have checked out than let it get worse - which means an inspection of what i mentioned above especailly so any foreign objects that may of been sucked in by the turbo or damage vanes/play in the shaft inside the turbo causing the vanes to contact the compressor housing hence the scream..