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REPAIR (cont) - TM-5-4210-220-34_388
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR (cont) - TM-5-4210-220-34_390
TM 5-4210-220-34 3-8. ENGINE - Continued 3-8.2 Turbocharger - Continued Death or serious injury could occur if compressed air is directed against the skin. Do not use compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less.  When working with compressed air always use chip guards, eye protection and other personal protective equipment. (17)  Clean all the Internal cavities and oil passages in center housing thoroughly with compressed air. (18)  Clean the oil passage in the backplate assembly and thrust collar with compressed air. (19)  Remove oil inlet line from engine and thoroughly clean.  Replace line if dented or crimped restricting oil flow. (20)  Inspect all parts for signs of damage, corrosion, or deterioration.  Check for nicked, crossed, or stripped threads. (21)  Check  the  turbine  wheel  shroud  and  turbine  wheel  assembly  for  signs  of  rubbing.    Inspect  shaft  to bearing area contact for excessive wear, discoloration, scoring, burnt carbon deposits, bearing seizure, or aluminum transfer deposits from bearing to shaft. (22)  Check compressor wheel for signs of rubbing or damaged fins.  Wheel must be free of foreign material. (23)  Inspect seal ring surfaces of center housing and backplate assembly.  If signs of scoring or excessive wear  are  detected,  replace  worn  part(s).    During  inspection  of  rotating  group,  if  it  is  determined  that numerous individual parts are required to repair turbocharger, it is advisable to  repair  turbocharger  by replacing  center  housing  assembly.    Center  housing  assembly  consists  of  housing,  center  bearings, thrust collar, seal rings, turbine wheel assembly, compressor wheel, and locknut. (24)  It  is  recommended  that  the  seal  ring,  piston  rings,  thrust  bearings,  bearing  washers,  snap  rings,  lock plates, and bolts be replaced whenever the turbine is repaired.  The backplate must be replaced if the thrust bearing is excessively worn. (25)  Check each part prior to installation to ensure cleanliness. (26)  Install snap ring (26), washer (25), bearing (24), and snap ring (23) in turbine end of center housing. (27)  Install snap ring (22), bearing washer (21), and bearing (20) in the compressor end of center housing. NOTE Before installing the piston rings, fill the grooves with silicone grease (item 27, Appendix B). (28)  Lubricate new bearings with clean engine oil (item 17, Appendix B). 3-98

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