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

  TM-9-2320-361-34 - Page 695 of 764

TM 9-2320-361-34
17-19. ENGINE COOLANT HEATER TESTING
(Contd)
I
c. Flame Detector Switch
Test
1. Place switch (3) in START position.
2. When indicator lamp (4) illuminates, place switch (3) in RUN position.
3. If indicator lamp (4) does not light, adjustor replace flame detector switch (6) (para. 17-2).
4. Place switch (3) in OFF position.
I
d. Fuel Control Valve Test
1. Place switch (3) in START position.
2. When indicator lamp (4) illuminates, place switch (3) in RUN position.
3. Check fuel consumption at flowmeter (1). Fuel consumption should be 8-11 cc/min at low heat, and
14-19 cc/min at high heat. Replace fuel control valve (2) if fuel consumption rate is not within
limits (para. 17-6).
4. Check operating amperage on ammeter (2). If operating amperage exceeds 4 amperes, check heater
wiring. Replace damaged parts (paras. 17-2 through 17-10, as necessary).
5. Move switch (5) from LO to HI position. Burning in heater (8) should intensify or decrease. Replace
fuel control valve (7) if burning in heater (8) does not intensify or decrease (para. 17-6).
6. Place switch (5) in LO position.
7. Place switch (3) in OFF position.
When indicator lamp (4) illuminates, place switch (3) in RUN position. Allow heater to run for a few
minutes.
NOTE
Purge time is the interval from turning control box to OFF position
until the indicator lamp goes out.
Place switch (3) in OFF position and record purge time. Burning should stop within thirty seconds;
blower motor should continue to run up to three minutes. Replace or adjust flame detector
switch (6) (para. 17-2) if purge time exceeds three minutes.
I
e.
Blower Motor Test
1. Place switch (3) in START position.
2.
3.
17-52


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