ARMY TM 9-6115-604-12
NAVY NAVFAC P 8 633-12
(1) Disconnect sender lead from coolant temperature sender MT3 on the left thermostat housing on the engine
block (see Figure 3-3).
(2) Connect a multimeter between the temperature sender MT3 and ground. The resistance reading of the
sending unit should be as follows:
at 30°F ........ ............................ approximately 1K ohms
at 70°F ..................................... approximately 580 ohms
at 120°F.................................... approximately 300 ohms
at 190°F ................................... approximately 145 ohms
(3) Replace coolant temperature sender MT3 that falls test. Reinstall lead on coolant temperature sender MT3
after test.
b
Remove. Drain coolant.
(1) Set 24 V dc CONTROL POWER CIRCUIT BREAKER CB1 to OFF.
(2) Tag and disconnect wires to coolant temperature sender MT3 (see Figure 3-3).
(3) Remove coolant temperature sender MT3 from the thermostat housing.
c.
Install
(1) Ensure that 24 V dc CONTROL POWER CIRCUIT BREAKER CB1 is set to OFF.
(2) Install coolant temperature sender MT3 (see Figure 3-3) In the thermostat housing.
(3) Connect wires to coolant temperature sender MT3 and discard tags.
(4) Set 24 V dc CONTROL POWER CIRCUIT BREAKER CB1 to ON.
4-124. FUEL LEVEL GAGE M4 (8, Figure 2-1). FUEL LEVEL GAGE M4 indicates the quantity of fuel Inside the fuel
tank.
Dangerous voltage levels may be present at components located within cabinet C.
Observe all applicable safety precautions as outlined in Chapter 1, Section III, of
this manual.
a.
Test
(1) Set 24 V DC CONTROL POWER CIRCUIT BREAKER CB1 TO ON.
(2) Open engine control cabinet C Disconnect sender lead from sender input terminal on FUEL LEVEL gage M4.
FUEL LEVEL gage pointer should deflect full scale to E (empty).
(3) With sender lead disconnected, jumper the sender input terminal on FUEL LEVEL gage M4 to the case
ground or the mounting bracket FUEL LEVEL gage M4 pointer should now deflect full scale to F (full).
(4) Set 24 V dc CONTROL POWER CIRCUIT BREAKER CB1 to OFF
(5) Replace FUEL LEVEL gage M4 (3, Figure 4-75) if it falls this test. Reinstall sender lead on sender input
terminal of FUEL LEVEL gage M4 If gage passes testing.
(6) If FUEL LEVEL gage M4 is properly functioning, test and/or replace fuel quantity transmitter MT4 in
accordance with paragraph 4-31.
(7) If both FUEL LEVEL gage M4 and fuel quantity transmitter MT4 are good, check wiring using FO-2 to isolate
any defective wire or component.
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