Quantcast ENGINE SHUTDOWN DUE TO FAULT: COOLANT OVERHEATING

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ELECTRIC PROTECTIVE SYSTEM
SYSTEMS OPERATION
ENGINE SHUTDOWN DUE TO FAULT:
COOLANT OVERHEATING
The current flow of the circuit shown in Fig. 8 is for an engine running at
a speed above the oil step setting with coolant temperature hot enough
[980C (2080F)] to close water temperature contactor switch (WTS).
When WTS closes, this completes the circuit through slave relay (SR1)
and through water temperature indicator (WTI). When slave relay (SR 1
) is energized, the contacts across terminals SR1-1 and SR1-3 will
close. Now the fuel shut-off solenoid (FSOS) is energized to shut the
fuel off to the engine.
After 70 seconds (when TDI contacts open), the engine can be started
again, but it will immediately be shutdown. The engine will not continue
to run until coolant temperature cools down enough to open switch
WTS.
NOTE: Engine shutdown caused by coolant overheating will also be the
same if the engine is running at a speed below the oil step setting.
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