TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

TM-9-2330-356-14 - Page 191 of 528

TM 9-2330-356-14

the side of the engine next to the tank. Its operating

contacts are normally closed. If engine temperature rises

above 240” F, the switch contacts open, de-energizing the

fuel stop solenoid and stopping the engine. The switch

closes again at about 195°F.

(2) The low oil pressure switch (fig. 4-35) is

located behind the engine shroud door. The switch is

normally open. As the engine is cranked over, the switch

contacts close, completing the circuit to the fuel stop

solenoid (fig. 4-36).

(3) If oil pressure drops below approximately 13

psi, the switch opens the fuel stop solenoid circuit and the

engine will stop.

(4) If fuel flow from the tank stops due to no fuel,

a clog in the fuel line, or a short in the solenoid circuit, the

fuel stop solenoid will de-energize. The engine will stop.

b.

Test.

(1)

High Temperature Switch (Fig. 4-34).

NOTE

Make sure engine temperature is below

195 ‘F before attempting this test.

(a)

Open the engine junction box and

disconnect the two high temperature switch leads. These

leads should be marked with the number 35 on a band

marker.

(b)

Using a continuity tester, test for

continuity of the high temperature switch. If tester

indicates there is continuity, the switch should be okay. If

the tester shows that there is no continuity, the switch is

defective and must be replaced.

Figure

4-34.

High Temperature Switch Location.

TA099789

4-55