ENGINE SHUTDOWN DUE TO FAULT: COOLANT OVERHEATING

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Fig. 7. ENGINE SHUTDOWN DUE TO FAULT: LOW OIL PRESSURE (AT ENGINE SPEEDS BELOW OIL STEP SPEED SETTING)

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TM-5-2815-232-14 Engine Diesel Caterpillar Model 3508 Manual

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Fig. 8. ENGINE SHUTDOWN DUE TO FAULT: COOLANT OVERHEATING

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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