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Measuring rotor deflection and thrust clearances in a turbocharger

after assembling the turbocharger during overhaul, turn the compressor impeller with hand and confirm smooth rotation, the measure shaft deflection using a dial gauge keeping the dial at the end of rotor and rotating it by hand. Maximum clearance allowed is .05mm. higher deflection shows worn bearings or ingress of particles in oil.  thrust clearances it is the axial movement of rotor when pressed by hand, it is measured by keeping the dial gauge at the end of rotor axially. .1mm to .16mm is the normal value. the clearance between turbine wheel and casing, compressor wheel diffuser must also be measured.
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