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TM 3-1040-279-12&P
4-27 PULSE JET ENGINE ASSEMBLY (CONT).
a. Engine Run Thermal Switch S104.
b. High Temp Thermal Switch TS101.
REMOVAL
NOTE
Procedures for removing both thermal
switches are the same.
1. Loosen but do not remove clamp nut (1) on clamp (2) securing nozzle assembly (3).
2. Open clamp (2) by lifting catch (4), and remove nozzle assembly (3) from engine head (5).
3. Disconnect purge air line (6) from pulse jet engine (7).
4. Disconnect ignition cable (8) from pulse jet engine (7).
5. Disconnect fog oil hose (9) from pulse jet engine (7).
6. Disconnect cable assembly (10) from equipment container (11), and sensing element (12).
7. Remove four screws (13) and washers (14) securing drip pan (15) and remove drip pan.
8. Remove eight screws (16), twelve washers (17), and four nuts (18) securing pulse jet engine (7).
9. Remove pulse jet engine (7) from rear of frame assembly (19).
10. Remove ten screws (20) securing cooling baffle (21),
11. Remove three screws (22) washers (23), and clamps (24) securing cable assembly (10) to cooling
baffle (21).
12. Remove four nuts (25) and washers (26) and remove cooling baffle (21), and insulating pad (27).
13. Tag and remove cable assembly from appropriate thermal switch (either engine run thermal switch
(28) or high temperature thermal switch (29)).
14. Remove thermal switch from pulse jet engine (7).
INSTALLATION
CAUTION
Handle thermal switches with care. Rough
handling or dropping of switches will cause
internal damage or break terminal ears.
1. Apply antiseize compound (Item 1A, App E) to threads of thermal switches and install switch
in pulse jet engine (7). Take care not to bend or break terminal ears during installation.
2. Position insulating pad (27), and cooling baffle (21) on pulse jet engine (7) and secure with four
nuts (25) and washers (26).
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