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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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