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PROPER OPERATION OF TliE SWITCHES OR ALARM SYSTEM FOR
TESTING THE ELECTRICAL SHUTDOWN
The protective system is activated whenever low lubricating oil pressure, high coolant temperature,
engine overspeed, or any other abnormal condition develops that could damage the engine.
In a properly maintained installation, the shutdown system seldom has cause to function. Check
the system periodically to ensure that it will function when needed.
Check each component of the shutdown system as outlined below:
NOTE:
Thoroughly warm-up the engine before any component of the shutdown system is
checked.
Overspeed Governor
Check the overspeed governor as follows:
l. Remove the valve rocker cover. Discard the gasket.
2. Start the engine, and move the speed control lever to the full-speed position.
3. While watching a tachometer, manually move the control tube slowly toward the increased
fuel position until the air shutoff valve closes and stops the engine.
NOTE:
Do not exceed the engine no-load operating speed by more than 1 0%.
4. Observe the speed at which the engine stops, and adjust the overspeed governor if
necessary.
5.
Using new gaskets, install the valve rocker cover.
Water Temperature Switch
Check the water temperature switch as follows:
NOTE:
The terminals of the water temperature switch are connected into the shutdown system.
When the engine water temperature reaches 99°C (210°F), the switch closes and
completes the circuit in the shutdown or alarm system.
l. Cover the radiator with a sheet of cardboard to prevent circulation of air.
8-74
AN
information
subject
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6$E379 9909
Copyright © 1999 DETROIT DIESEL CORPORATION
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