KIT-ENGINE OVERHAUL 3707907 - Caterpillar

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Left side view (1) Primary speed/timing sensor (2) Fuel temperature sensor (3) Inlet air temperature sensor (If Equipped) (4) Inlet manifold pressure sensor (5) Customer connector (6) Marine transmission temperature sensor (7) Marine transmission oil pressure sensor (8) Coolant level sensor (9) Fuel pressure sensor (10) Atmospheric pressure sensor (If Equipped)
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Right side view (11) Coolant temperature sensor (12) Secondary speed/timing sensor (13) Engine oil pressure sensorYour engine may be equipped with various optional engine features and controls that are not pictured here. This section discusses the general information about various features and the engine control systems.Coolant Temperature Sensor
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Coolant temperature sensorThis sensor monitors engine coolant temperature. The coolant temperature signal is sent to the Electronic Control Module (ECM) for engine monitoring and for improved engine control. The output of the ECM can indicate a high coolant temperature through a relay or a lamp. In addition, the sensor activates the cold start strategy which improves the startability of the engine.The minimum coolant temperature that will activate the alarm is 106°C (223°F). The switch opens as the coolant cools. A resetting procedure is not required.Failure of the Coolant Temperature Sensor
If one of the following conditions exist, a failure of the coolant temperature sensor may have occurred:
Sensor output is open.
Sensor output is shorted to ground or supply.
Measured reading of the coolant temperature is out of the specification.The ECM will detect the failure of the coolant temperature sensor. The diagnostic lamp will warn the operator about the status of the coolant temperature sensor. Strategies that are related to the coolant temperature will be disabled. A failure of the coolant temperature sensor will not cause a shutdown of the engine or any horsepower change.Coolant Level Sensor
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Coolant level sensorThe coolant level sensor monitors the engine coolant level. The coolant level sensor is used to detect a condition when the coolant level is low. The coolant level sensor provides information to the Electronic Control Module (ECM). The output from the ECM can indicate a low coolant level through a relay or a lamp. Coolant must be added to the cooling system in order to correct the condition. See this Operation and Maintenance Manual, "Refill Capacities" and this Operation and Maintenance Manual, "Fluid Recommendations" for more information.Failure of the Coolant Level Sensor
When the output of the coolant level sensor is open, shorted to ground or shorted to supply, a failure of the coolant level sensor may have occurred.A failure of the coolant level sensor will not cause a shutdown of the engine or any horsepower change.Engine Oil Pressure Sensor
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Engine oil pressure sensorThe engine oil pressure sensor can detect engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the Electronic Control Module (ECM).Low Oil Pressure Warning
The setpoint is dependent upon the engine rpm. The fault will be active and logged only if the engine has been running for more than 15 seconds. Very Low Oil Pressure Warning
The very low oil pressure setpoint is dependent upon the engine