ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 NOTE There will be some play because bearings inside center housing are free floating. d. Next, check shaft end-play by moving shaft back and forth while rotating.  There will be some end-play but not to extent that wheels contact housings. 3-13.3.  Test 3-13.3.1  Radial Bearing Clearance Test. NOTE This test will give an indication of condition of radial bearings within center housing and rotating assembly. a. Fasten a plunger-type dial indicator to turbocharger mounting base.  Assemble an extension adapter and a 2.0 inch (51 mm) indicator extension rod onto dial indicator. b. Position indicator tip (through center housing oil return) on center of shaft.  Preload indicator tip and zero dial on indicator. c. Grasp rotating shaft at both ends and move shaft toward indicator then away from indicator.  Use care to move shaft in same direction as dial indicator tip travels and apply equal pressure at both ends of shaft. d. Observe and record total indicator reading.  Bearing clearance specification is 0.003 to 0.006 inch (0.08 to 0.15 mm) e.  If total indicator reading is not within specification, replace turbocharger. 3-13.3.2  Axial End Play Bearing Test. NOTE This test will give an indication of condition of thrust bearing within center housing and rotating assembly. a. Mount  base  dial  indicator  so  that  indicator  tip  rests  on  end  of  shaft.    Preload  indicator  tip  and  zero  dial  on indicator. b. Move shaft axially back and forth by hand. c. Observe and record total dial indicator reading.  Bearing end play specification is 0.001 to 0.004 inch (0.025 to 0.10 mm). d. If bearing end play is not within specification, replace turbocharger. 3-13.4.  Installation. CAUTION If  turbocharger  failed  because  of  foreign  material  entering  the  air  Intake  system,  be  sure  to examine the system and clean as required to prevent a repeat failure. CAUTION Inspect the rubber hose at the end of the turbo oil return line for damage or cracks.  Replace as necessary.      Since   the   greatest   amount   of   suction   occurs   between   the   air   cleaner   and turbocharger, it is essential that the hose connections are tight to prevent entry of dirt Into the engine. 3-49