i'm not 100% ofair with what to do here, the turbo is 3 year old but only done 5000 miles when i took the boost hose off to the air filter, the turbo blades spun freely and quitely but its nano close to the alloy housing at the edge of the blades, is this normal, and how do you check for play and is it adjustable if so how.. im a bit new to all this can you tell, so please be gentle with me......