TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 645 of 764
TM 9-2320-361-34
17-2. ENGINE COOlANT HEATER FLAME DETECTOR SWITCH MAINTENANCE
THIS TASK COVERS:
a. Removal
d. Assembly
b. Disassembly
e. Installation
c. Inspection
INITIAL SETUP
APPLICABLE MODELS
MATERIALS/PARTS
All
Sleeve (Appendix F, Item 261)
TEST EQUIPMENT
Multimeter (Appendix B, Item 3)
TOOLS
General mechanic’s tool kit
(Appendix B, Item 1)
Tool kit, electrical (Appendix B, Item 2)
REFERENCES (TM)
TM 9-2320-361-20
TM 9-2320-361-34P
EQUIPMENT CONDITION
Engine coolant heater removed (TM 9-2320-361-20).
NOT E
Tag wires for installation.
a. Removal
1. Remove four screws (6) and guard (7) from heater housing (8).
2. Remove nut-assembled lockwasher (2), ground lead (3), air tube (4), and elbows (1) and (5) from
heater housing (8).
3. Remove five screw-assembled lockwashers (11) and six leads (12) from flame detector switch (10).
4. Loosen nut (9) and remove flame detector switch (10) from heater housing (8).
b. Disassembly
1. Remove adjusting screw (15), washer (16), and spring (17) from switch bracket (24) and mount (18).
CAUTION
Ceramic rod is very brittle and is easily broken; handle carefully.
2. Tilt microswitch (13) back on switch bracket (24), invert, and remove ceramic rod (22) from
probe (20).
3. Remove two nut-assembled lockwashers (14), screws (23), and microswitch (13) from switch bracket (24).
4. Remove split roll pin (21) and switch bracket (24) from mount (18).
5. Remove sleeve (19) and nut (9) from probe (20).
c. Inspection
1. Inspect flame detector switch (10) for broken ceramic rod (22) or bent probe (20). Replace ceramic
rod (22) if broken. Replace flame detector switch (10) if probe (20) is bent.
2. Inspect flame detector switch (10) for carbon buildup and corrosion. Remove carbon buildup or
corrosion.
17-2
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