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TM   9-2815-202-34 4-37.   TURBOCHARGER   REPAIR   (Cont) d.   Assembly (1) (2) (3) (4) (5) (6) (7) (8) Lubricate  bearings  (27  and  33)  with  engine  oil. Install inner retaining ring (31 ), bearing (33), bearing washer (32), and outer retaining ring (31) in turbine end of center housing (2). Install retaining ring (29), bearing washer (28), and bearing (27) in compressor end of center housing  (2). If removed, install two pins (30) in compressor end of center housing (2). Pins must extend 0.075 to 0.085 inch above surface. Install thrust washer (26) with hole and cutout in thrust washer in alinement with pins (30). Install  thrust  washer  with  smooth  side  against  center  housing. Lubricate thrust collar (25) and thrust washer (26) with engine oil. With center  housing assembly  (2)  laying  flat  on  bench,  compressor  end  up,  place  thrust  collar  snugly  against thrust  washer. Install seal ring (22) in groove at compressor end of center housing (2). Aline oil feed hole in center housing (2) and backplate assembly (5). Attach backplate to center housing with four bolts (21 ) and four locking plates (20). Torque bolts to 13-15 Ib-ft (18-20 N-m) and bend locking-plate tangs up against side of bolt head. CAUTION Do not cock or force piston ring (19) in groove. Ring is brittle and will snap easily. NOTE Piston ring (19) is used only on some turbochargers. If there is no groove in shaft, ring is not required. (9) Install piston ring (19) on wheel shaft assembly (15). 4-180


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