TM 10-3930-659-34 5-8. TURBOCHARGER TEST AND REPAIR (Con’t). 4. Remove elbow (11) from center housing (5). 5. Clamp turbocharger turbine wheel holding fixture (12) in vise.  Install center housing (5) and wheel and shaft assembly (3) in holding fixture. 6. Remove   locknut   (14)   and   impeller   (13)   from wheel and shaft assembly (3).  Discard locknut. 7. Remove  center  housing  (5)   from   turbocharger turbine wheel holding fixture (12). CAUTION Use   care   to   keep   wheel   and   shaft assembly  centered  in  thrust  bearing when     removing     wheel     and     shaft assembly from center housing. Damage to parts may occur. 8. Remove   wheel   and   shaft   assembly   (3)   from center housing (5). 9. Remove  piston  ring  (17)  and  wheel  shroud  (16) from wheel and shaft assembly (3). 5-57