TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 158 of 953
3-77. WATER CROSSOVER MAINTENANCE This task covers: a. Removal c. Installation b. Inspection a. Removal 1. Loosen three clamps (2) and disconnect hoses (1) from water crossover (4). 2. Remove four capscrews (6) from water crossover (4) and cylinder head (8). WARNING Gaskets installed on some 6.2L engines assembled prior to 1991 may contain asbestos. Gaskets should be removed with a scraper or putty knife and then be disposed of IAW current directives. Inhalation of asbestos fibers can cause respiratory ailments. 3. Remove water crossover (4) and two gaskets (7). Discard gaskets (7). 4. Clean gasket surface on water crossover (4) and cylinder head (8). INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Two gaskets (Appendix G, Item 51) Manual Refer ences TM 9-2320 280-24P Equipment Condition •Cooling system drained (para. 3-60). •Fan temperature switch removed (para. 4-30). •Glow plug controller removed (para. 4-29). •Thermostat removed (para. 3-75). General Safety Instructions Gaskets installed on some 6.2L engines assembled prior to 1991 may contain asbestos. Gaskets should be disposed of IAW current directives. c. Installation b. Inspection 1. Install two gaskets (7) and water crossover (4) on cylinder head (8). 2. Secure water crossover (4) to cylinder head (8) with four capscrews (6). Tighten capscrews (6) to 25-35 lb-ft (34-50 N• m). 3. Connect three hoses (1) to water crossover (4) with clamps (2). TM 9-2320-280-20-2 3-132 Change 3 Inspect thermostat by-pass nipple (3), surge tank hose nipple (5) and water pump hose adapter (9) for cracks or breaks. Replace if defective.