TM-9-2320-361-24-2
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 2 OF 2
AUGUST 2006
TM-9-2320-361-24-2 - Page 856 of 1144
TM 9-2320-361-24-2
0426 00
0426 00-4
ENGINE COOLANT HEATER TESTING (Contd)
PREPARATION (Contd)
2.
Remove four screws (2) and guard (1) from heater (9).
3.
Disconnect lead (17) from 24-volt power source (18).
4.
Remove screw (14), washer (11), and igniter lead (13) from flame detector switch (10).
5.
Disconnect fuel control valve leads (6) and (8) from overheat switch (7).
6.
Connect hose (4) to bleed screw (14) on fuel control valve (3) and place other end of hose (4) in
container (5).
7.
Open two fuel shutoff valves (15).
NOTE
Have drainage container ready to catch fuel.
8.
Connect lead (17) to power source (18).
9.
Ensure switch (22) is in LO position. Place switch (20) in START position and hold. Open bleed
screw (14) and let fuel flow until no air bubbles are observed in fuel flowing into container (5).
10.
Place switch (20) in OFF position. Close bleed screw (14).
11.
Disconnect lead (17) from power source (18).
12.
Install igniter lead (13) on flame detector switch (10) with washer (11), and screw (12).
13.
Connect fuel control valve leads (6) and (8) on overheat switch (7).
14.
Open coolant shutoff valve (16).
15.
Check for signs of coolant leaks. Tighten loose connections or replace damaged parts if leaking
(WP 0417 00–WP 0425 00) as necessary.
16.
Close coolant shutoff valve (16).
IGNITER TEST
NOTE
Ignition time is the interval from activating control box switch
to START position until indicator lamp illuminates.
1.
Place switch (20) in START position and hold. Record time interval from activating switch (20)
until indicator lamp (21) illuminates. During this time interval, record ignition amperage on
ammeter (19).
2.
If ignition time exceeds three minutes, or if ignition amperage exceeds 15 amperes, check fuel flow
components (WP 0417 00–WP 0425 00) as necessary.
3.
Place switch (20) in OFF position.
Back to Top
