SERVICE MANUAL PRE-DISASSEMBLY CHECKS Make the following checks and if the turbocharger    meets    these    requirements,    it    can    be considered satisfactory and reinstalled on the engine.  If it  does  not  meet  the  requirements,    it  must  be  rebuilt (refer to "Disassembly"). CHECK FOR FREE ROTATION 1. Stand the turbocharger on bench with shaft in a horizontal position. 2. Wheels must spin freely when turned by hand. CHECK AXIAL END PLAY 1. Clamp turbocharger in a vise and position a dial indicator  with  a  magnetic  base  on  the  frame  of the vise (Fig. 8).  (Any type base may be used as long  as  a  similar  position  can  be  obtained.    ) Place the foot of the indicator on the turbine end of the shaft. Fig. 8.  Checking Axial End Play 2. Move   the   shaft   back   and   forth   by   hand   and record the reading. 3. If   the   reading   exceeds   the   specifications,   the turbocharger must be disassembled and repaired (see "Specifications"). CHECK RADIAL SHAFT MOVEMENT 1. Remove  the  protective  cover  from  the  oil  drain port in the center housing. 2. Install a two inch contact point extension on  the dial indicator and position the indicator as shown in   Fig.   9.      The   indicator   contact   point   must contact  the   turbine   shaft   through   the   oil   drain port in the center housing. Fig. 9.  Checking Radiator Shaft Movement With Housing Installed 3. Hold   both   ends   of   the   rotating   assembly   and move   the   shaft   up   and   down,   parallel   to   the extension of the dial indicator (Fig. 9), Be sure to exert equal pressure on both ends of the rotating assembly. 4. If the readings are not within specifications,  the turbocharger must be disassembled and repaired (see "Specifications"). 5. If  the  indicator  readings  taken  in  Step  3  were satisfactory, but interference between the compressor  housing  and  compressor  wheel  is suspected, punch mark the compressor housing, center    housing    and    back    plate    to    facilitate reassembly and remove the compressor housing and diffuser. 6. Install the dial indicator as outlined in CTS-4104 Page 9 CTS-4104 PRINTED IN UNITED STATES OF AMERICA Page 9