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Page Title: b. INSTALLATION
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TM   9-2350-287-20-2 21-10.  ENGINE  COMPARTMENT  FIRE  SENSING  ELEMENT  COUPLINGS  REPLACEMENT (continued). b. 1. 2. 3. 4. 5. 6. 7. 8. INSTALLATION Remove two caps (1 and 18) from straight coupling (2), and install straight coupling (2) on bracket (6) with key washer (3) and nut (4). Do not tighten nut (4). With the aid of an assistant, turn straight coupling (2) and key washer (3) until tab on key washer (3) fits into slot on bracket (6), Tighten nut (4). CAUTION Do   not   overtighten   sensing   element   couplings.   Damage   to   sensing   element   may occur. Connect sensing element (5) to both ends of straight coupling (2). Remove two caps (12 and 14) from elbow couupling (1 3), and install elbow coupling(13) on bracket (16) with key washer (15) and nut (17). Do not tighten nut (17). With the aid of an assistant, turn elbow coupling (1 3) and key washer (1 5) in bracket (16) until tab in key washer (15) fits into slot on bracket (16). Tighten nut (17). CAUTION Do  not  overtighten  sensing  element  couplings.  Damage  to  sensing  element  may occur. Connect sensing element (5) to both ends of elbow coupiing(13). NOTE Steps 7 and 8 cover installation of two bulkhead elbow couplings. An assistant is needed to hold bulkhead elbow couplings in place while securing. Remove two caps (8 and 11) from elbow coupling (7), install elbow coupling (7) on adapter (10), and tighten nut (9) on adapter (10). CAUTION Do  not  overtighten  sensing  element  couplings.  Damage  to  sensing  element  may occur. Connect sensing element (5) to elbow coupling (7). FOLLOW-ON MAINTENANCE: Install powerpack (para 3-2). Install master relay, if removed (para 7-21). Close  battery  compartment  access  doors  (refer  to  TM  9-2350-287-10). Perform engine AFES test (refer to TM 9-2350 -287-10). 21-39

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