TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
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3-57. RIGHT EXHAUST MANIFOLD REPLACEMENT This task covers: a. Removal b. Installation 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) Three locknuts (Appendix G, Item 128) Manifold seal (Appendix G, Item 197) Manual References TM 9-2820-280-24P Equipment Condition • Air horn and elbow removed (para. 3-14). • Right exhaust manifold heat shield removed (para. 3-55). General Safety Instructions • Do not touch hot exhaust system components with bare hands. • Place used gaskets in a plastic, leakproof, sealed bag or container. WARNING Do not touch hot exhaust system components with bare hands. Severe injury will result. 1. Remove three locknuts (10), washers (7), capscrews (6), and washers (7) from exhaust manifold (3) and crossover pipe (9). Discard locknuts (10). 2. Using hex head driver, remove eight socket-head screws (5) and washers (4) from exhaust manifold (3) and cylinder head (1). 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. 3. Remove exhaust manifold (3), gasket (2), and manifold seal (8). Discard gasket (2) and manifold seal (8). 4. Clean all gasket material from head mounting surface and manifold mating surface. CAUTION Alternate screw tightening. Flanges often break when each screw is tightened completely before others are snugged up. NOTE Ensure replacement gasket has a silver, shiny surface, not a dull, dark surface, which is characteristic of a gasket containing asbestos. 1. Install gasket (2) and exhaust manifold (3) to cylinder head (1) with eight socket-head screws (5) and washers (4). Tighten socket-head screws (5) to 25-33 lb-ft (34-45 N . m). 2. Install exhaust manifold (3) to crossover pipe (9) with manifold seal (8), three washers (7), capscrews (6), washers (7), and locknuts (10). Tighten locknuts (10) to 37 lb-ft (50 N . m). b. Installation a. Removal TM 9-2320-280-20-2 3-104 Change 3