ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 4-38 (5)     Remove capscrews (4) and disconnect oil return pipe (5).  Remove line (5) and gasket (9); discard gasket (9). (6)     Remove four mounting capscrews (10) securing turbocharger (12) to exhaust manifold.  Remove turbocharger (12) and stainless steel gasket (13); discard gasket (13). (7)     Cover all openings to prevent entry of foreign material. b.     Inspection. The following inspection procedure is recommended for systematic failure analysis of a suspected turbocharger failure.  This procedure will help to identify when a turbocharger has failed, and why it has failed so the primary cause of failure can be corrected.  Proper diagnosis of a “non-failed” turbocharger is important for two reasons.  First, identification of a “non-failed” turbocharger will lead to further investigation and repair of the cause of a performance complaint.  Second, proper diagnosis eliminates unnecessary expense incurred when a “non-failed” turbocharger is replaced. (1)     Remove turbocharger, refer to step a. (2)     Inspect compressor housing inlet and compressor wheel. (a)     Check compressor inlet and compressor wheel for foreign object damage.  If foreign object damage is found, locate and correct source of foreign object damage. NOTE Score marks can be difficult to see.  Provide adequate lighting to insure that damage is not overlooked. (b)   Check compressor inlet for wheel rub on the housing.  Check for score marks on housing and check tips of compressor wheel blades for damage. (3)     Inspect housing outlet.  The outlet should be clean and free of dirt and oil. (4)     Inspect turbine housing inlet. (a)     Check turbine housing inlet ports for oil in housing and excessive carbon deposit.  Oil or excessive carbon deposits in the inlet port indicates an engine problem is likely. (b)     Check turbine housing inlet ports for erosion of center walls.  Center wall erosion (cracking or missing pieces) indicates excessive exhaust temperature.