TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 110 of 953
3-48. MUFFLER AND INSULATOR REPLACEMENT (ALL MODELS EXCEPT M1123 AND “A2” VEHICLES) This task covers: a. Removal b. Installation INITIAL SETUP: Applicable Models All except: M997A2, M1025A2, M1035A2, M1043A2, M1045A2, M1097A2, M1123 Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Par ts Nine locknuts (Appendix G, Item 128) Gasket (Appendix G, Item 42) Two lockwashers (Appendix G, Item 133) Manual References TM 9-2320-280-24P Equipment Condition Tailpipe removed (para. 3-47). General Safety Instructions Do not touch hot exhaust system components with bare hands. WARNING Do not touch hot exhaust system components with bare hands. Severe injury will result. 1. Remove three locknuts (10), washers (9), capscrews (12), and washers (9) from muffler (7) and crossover pipe (8). Discard locknuts (10). 2. Remove two nuts (16), lockwashers (15), and U-bolt (13) from muffler (7) and support bracket (14). Discard lockwashers (15). 3. Remove gasket (11) by pulling muffler (7) towards rear of vehicle. Discard gasket (11). NOTE It may be necessary to lower rear propeller shaft (para. 6-5) to gain access to locknuts on muffler hanger. 4. Remove four locknuts (3), washers (2), capscrews (6), and washers (2) securing insulator (4) and retaining plates (5) to muffler hanger (1) and remove muffler (7). Discard locknuts (3). 5. Remove two locknuts (17), washers (18), capscrews (20), washers (18), insulator (4), and retaining plate (19) from muffler (7). Discard locknuts (17). 1. Install insulator (4) and retaining plate (19) to muffler (7) with two washers (18), capscrews (20), washers (18), and locknuts (17). Tighten locknuts (17) to 10 lb-ft (14 N•m). 2. Install muffler (7), insulator (4), and retaining plates (5) to muffler hanger (1) with four washers (2), capscrews (6), washers (2), and locknuts (3). 3. Install muffler (7) on bracket (14) with U-bolt (13), two lockwashers (15), and nuts (16). 4. Install gasket (11) and muffler (7) on crossover pipe (8) with three washers (9), capscrews (12), washers (9), and locknuts (10). Tighten locknuts (10) to 26 lb-ft (35 N•m). b. Installation a. Removal TM 9-2320-280-20-2 3-88 Change 3