TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
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3-56. LEFT EXHAUST MANIFOLD REPLACEMENT This task covers: a. Removal b. Installation WARNING Do not touch hot exhaust system components with bare hands. Severe injury will result. 1. Remove three locknuts (8), washers (9), capscrews (11), and washers (9) from crossover pipe (7) and exhaust manifold (4). Discard locknuts (8). NOTE Some vehicles may have a socket-head screw in place of stud to secure alternator support bracket and exhaust manifold to cylinder head. 2. Remove locknut (14), washer (15) and alternator support bracket (1) from exhaust manifold (4) and stud (2). Discard locknut (14). 3. Remove stud (2) and washer (3) from exhaust manifold (4) and cylinder head (6). 4. Using hex-head driver, remove seven socket-head screws (12) and washers (13) from exhaust manifold (4) and cylinder head (6). WARNING • Vehicles with serial numbers USBL Eff. 1 through 118767 have manifold gaskets containing asbestos fibers. When performing manifold maintenance, place used gaskets in a plastic, leakproof, sealed bag or container and contact the local health and safety department for further disposal instructions. • Failure to observe above warning may result in an environmental hazard. 5. Remove exhaust manifold (4), gasket (5), and manifold seal (10). Discard gasket (5) and manifold seal (10). 6. Clean all gasket material from head mounting surface and manifold mating surface. a. Removal INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Special Tools Hex-head driver, 8mm, (Appendix B, Item 156) Materials/Parts Gasket (Appendix G, Item 50) Four locknuts (Appendix G, Item 128) Manifold seal (Appendix G, Item 197) Manual References TM 9-2820-280-24P Equipment Condition • Engine access cover removed (para. 10-15). • Oil dipstick tube removed (para. 3-2). • 60 ampere alternator removed (para. 4-2). • 100 ampere alternator removed (para. 12-23 or 12-24). • 200 ampere alternator removed (para. 4-109 or 4-110). General Safety Instructions • Do not touch hot exhaust system components with bare hands. • Place used gaskets in a plastic, leakproof, sealed bag or container. TM 9-2320-280-20-2 3-102 Change 3