ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 1. ADAPTER 24 ADAPTER 2. SHUT OFF VALVE 25. HOSE ASSEMBLY 3. ELBOW 26 STRAIGHT ADAPTER 4. ADAPTER 27 HOSE 5. COOLANT BAND MARKER 28. CAPSCREW 6. HOSE ASSEMBLY 29. HEXAGONAL NUT 7 STRAIGHT ADAPTER 30 LOCKWASHER 8. HOSE ASSEMBLY 31 FLAT WASHER 9. NIPPLE 32 BRACKET 10. NIPPLE 33 HEATER ASSEMBLY H101, H102 11. SHUT OFF VALVE 34. HEATING ELEMENT 12. ELBOW 35. HOSE CLAMP 13. ELBOW 36 NIPPLE 14 CAPSCREW 37 HOSE 15. HEXAGONAL NUT 38. HEXAGONAL NUT 16. LOCKWASHER 39. BELL CAP 17. CLAMP 40 THERMOSTAT SENSING UNIT 18. BRACKET 41 THERMOSTAT BURR 19. HOSE ASSEMBLY 42 HEXAGON HEAD CAPSCREW 20 STRAIGHT ADAPTER 43. LOCKWASHER 21. HOSE 44 HEAD AND VALVE ASSEMBLY 22. NIPPLE 45. DRAIN PLUG 23 TEE 46. HEATING TANK Figure 4-46.  Engine Preheat Assembly (Sheet 3 of 3) d.  Install. (1)    Apply sealing compound MIL-S-45180, Type II, to all male pipe threads prior to installation. (2)   Thread heating elements (34) into heating tanks (46) and tighten. (3)   Install thermostat sensing assemblies consisting of thermostat burr (41), thermostat sensing unit (40), fill cap (39), and nut (38) on nipples (36) at ends of heater assemblies (33). (4)    Install replacement hose assemblies (6, 19, and 25) on engine block plumbing hardware by tightening hose adapters (7, 20, and 26). (5)   Slide heater assemblies H101 and H102 (33) under mounting brackets (32) and attach using capscrews (28), nuts (29), and lockwashers (30). (6)    Reconnect center hose assembly (25) and associated plumbing hardware to thermostat burrs (41) at end of each heater assembly (33) using adapter (24) and nipple (22). (7)   Reconnect hose assemblies (19) to elbows (13) on each heater assembly and tighten hose adapters (20). (8)   Reconnect wiring to thermostat sensing units (40) and heating element (34) on each heater assembly (33).   Remove tags and discard. (9)   Open all shutoff valves (2 and 11). (10)   Check coolant level and fill as required. 4-130