Quote:
|
Originally Posted by tuna
shaft play is unacceptable if the blades can contact the housing, it is also unacceptable if you can pull back and forth along the length of the turbine on the blades, this motion is the movement on the seals and explain why turbos will consume oil.
|
Just to add to this,
Thrust movement (back and forth) is slightly more critical than shaft play, when looking at a 2nd hand turbo.
Ball bearing turbos should have very little shaft play, whilst plain bearing turbos will have more, due to the oil clearance around the shaft. A dry bearing will play, but once oil goes to the bearing, it makes up the clearance.
In any case, the blades should not hit the housing.