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 659 of 764
TM 9-2320-361-34
17-7. ENGINE COOLANT HEATER OVERHEAT SWITCH AND IGNITER REPLACEMENT
THIS TASK COVERS:
a. Overheat Switch
Removal
d. Igniter Installation
b. Igniter Removal
e. Overheat Switch Installation
c.
Inspection
INITIAL SETUP
APPLICABLE MODELS
MATERIALS/PARTS
All
Igniter (Appendix F, Item
87)
TEST EQUIPMENT
REFERENCES (TM)
Multimeter (Appendix B, Item 3)
TM 9-2320-361-20
TOOLS
TM 9-2320-361-34P
General mechanic’s tool kit
EQUIPMENT CONDITION
(Appendix B, Item 1)
Engine coolant heater removed (TM 9-2320-361-20).
Tool kit, electrical (Appendix B, Item 2)
NOT E
Tag all leads for installation.
I
a. Overheat Switch Removal
I
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. Disconnect lead (9) from overheat switch (13).
4. Disconnect leads (10) and (12) from tab connector (11) and tab connector (11) from overheat
switch (13).
5. Remove nut (33), lockwasher (32), retainer (31), overheat switch (13), washer (14), and O-ring (15)
from heater housing (8).
b.
Igniter Removal
1. Remove four nut-assembled lockwashers (27) and end plate (26) from heater housing (8).
2. Remove screw-assembled lockwasher (21), ground strap (22), igniter lead (23), and lockwasher (24)
from burner (16).
3. Remove nut (28), ground strap (22), and lockwasher (29) from stud (30).
CAUTION
Igniter is fragile. Use care when removing igniter. Failure to do
so may result in damage to equipment.
4. Remove nuts (19) and (18), preheater resistor strap (17), igniter (20), and gasket (25) from
burner (16). Discard igniter (20).
c.
Inspection
Test overheat switch (13) for continuity. If continuity does not exist, replace overheat switch (13).
17-16
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