TM 5-6115-593-12 TO 35C2-3-463-1 of dirt is uneven, excessive, or approaching   the   appearance   of   a   layer which might flake off, cleaning is necessary.        If    this    cannot    be    cleaned satisfactorily, replace turbocharger. (6)   Replace hoses and clamps. b. Replacement. (1)   Disconnect  and  remove  oil  inlet  line  (15) and   elbow   (14).      Plug   line   to   minimize leakage. (2)   Disconnect  and  remove  oil  return  line  (9) and   adapter   (8).      Plug   line   to   minimize leakage. (3)   Loosen  clamps  (1,  16,  and  18).    Remove hoses (2 and 17). (4)   Remove nuts (19) which secure turbocharger to exhaust manifold. (5)   Remove   turbocharger   by   separating   unit from exhaust elbow (22) and lifting clear of engine. CAUTION While   turbocharger   is   off   the   engine, keep   all   intake   and   exhaust   manifold openings   covered.      This   will   prevent foreign  objects  from  accidentally  getting into   the   manifolds   and   damaging   the turbocharger  or  engine  when  the  engine is again put into operation. (6)   Position  turbocharger  on  exhaust  manifold. Slide onto exhaust elbow (22). (7)   Secure turbocharger with nuts (19). (8)   Install hoses (2 and 17). (9)   Tighten all clamps (1, 16, and 18). (10)  Connect oil return line (9) using adapter (8). (11) Connect  oil  inlet  line  (15)  using  elbow (14). 4-79.  WATER PUMP.  (See figure 4-40.) NOTE All    generator    sets    with    engine    serial number 10605201 and higher are equipped with  a  new  style  water  pump  (with  idler assembly).    The  new  pump  is  removed  in the same manner as the old pump. a. Replacement  of  Water  Pump.    (See  figure  4- 52.) (1)   Drain engine coolant. (2)   Remove   drive   belts   in   accordance   with paragraph 4-67 b. (3)   Remove coolant hoses. (4)   To    remove    water    pump    remove    eight mounting bolts (on pumps not equipped with idler assemblies) or five mounting bolts (on pumps with idler assemblies). (5)   Install water pump with mounting hardware. (6)   Attach hoses. (7)   Install  and  adjust  belts  in  accordance  with paragraph 4-67 b. (8)   Refill engine coolant; refer to tables 3-1 and 4-1. b. Inspection  of  Idler  Assembly.  Refer  to  figure  4- 52  and  visually  inspect  locator  spring  (14)  and spring (15) for cracks or damage. c. Replacement of Idler Assembly.  After removing water  pump  in  accordance  with  paragraph  a, above,  the  idler  assembly  may  be  removed  by removing   four   screws   (1)   and   washers   (2). Install   new   idler   pulley   assembly   with   four screws (1) and washers (2). 4-116