TM 9-2320-361-20 3-38. EXHAUST SYSTEM REPLACEMENT (M50A2 AND M50A3) (Contd) 10. Remove locknut (10), screw (2), coupling (3), and gasket (4) from exhaust pipe (1) and Y-pipe (5). Discard locknut (10) and gasket (4), 11. Remove locknut (9), screw (6), clamp (7), and Y-pipe (5) from bracket (8). Discard locknut (9). 12. Remove locknut (17), screw (14), coupling (15), exhaust pipe (1), and gasket (16) from exhaust pipe (18). Discard locknut (17) and gasket (16). 13. Remove four locknuts (19), screws (11), exhaust pipe (18), and gasket (13) from manifold (12). Discard locknuts (19) and gasket (13). b. Installation 1. 2. 3. 4. 5. 3-88 Install new gasket (13) and exhaust pipe (18) on exhaust manifold (12) with four screws (11) and new locknuts (19). Install new gasket (16) and exhaust pipe (1) on exhaust pipe (18) with coupling (15), screw (14), and new locknut (17). Install Y-pipe (5) on bracket (8) with clamp (7), screw (6), and new locknut (9). Do not tighten locknut (9). Install Y-pipe (5) on exhaust pipe (1) with new gasket (4), coupling (3), screw (2), and new locknut (10). Tighten locknut (9).