SEAL-O-RING 2366919 - Caterpillar

Engines may be equipped with optional engine protection devices. This section discusses general information about engine protection attachments and how a typical protection device operates.Shutoff systems are either electrically or mechanically operated. The operation of all electric shutoffs utilize components which actuate switches in a sensing unit. They are set at critical operating temperatures, pressures, levels or speed to protect the engine from damage.The switch closes the circuit to the shutoff solenoid which closes the fuel shutoff to the OFF position. The particular shutoff may require resetting before the engine will start.When any of these components stop the engine, the problem causing the shutdown must be corrected before attempting to restart the engine.Familiarize yourself with the types and locations of the shutoff controls, the conditions which cause each control to function, and the resetting procedure required to start your engine.Alarms
The alarm systems provide a signal to the operator that an abnormal operating condition exists. Abnormal operating conditions can include:* High engine jacket water temperature* Low engine oil pressure* Low cooling system coolant levelThe alarm will continue until the cause of the condition is corrected. The engine can be damaged if no corrective action is taken when an alarm is activated. To prevent this from occurring to unattended engines, engine shutoff devices are also used.Shutoff and Alarm System Testing
Refer to the Service Manual for the testing procedure.Check all engine protective devices according to the Maintenance Schedule. All engine protective devices must be checked and maintained to provide the engine with proper protection if a component malfunction or failure should occur.Your Caterpillar dealer has the trained personnel and equipment to perform this maintenance.Emergency Engine Stop
Always determine the cause of the engine shutdown. Make necessary repairs before attempting restarting the engine.
The engine may be equipped with Emergency Stop controls. Emergency Stop controls are for EMERGENCY use ONLY. DO NOT use Emergency shutoff devices or controls for normal stopping procedure. Refer to the Engine Stopping section of this manual for normal stopping procedures.Familiarize yourself with the locations of the shutoff controls. Emergency shutoff controls should only be used when an emergency exists, and not used to routinely stop the engine.Engine Protection Shutdowns
Engine protection shutdowns are electronically operated. Their function is to stop the engine for such reasons as loss of speed signal and power loss to the ECM.Temperature warnings can be wired to relays by the customer to affect automatic shutdown. Leads are available in the wiring harness for customer supplied inlet air shutdown valves.Engine Coolant Temperature
Engine coolant temperature sensor location.The engine coolant temperature sensor monitors engine coolant temperature and performs high engine coolant temperature annunciation (and diagnostics for the Electronic engines).This feature is used for engine system diagnostics. The output from the ECM can be used to drive a relay or a lamp to annunciate high coolant temperature condition. In addition, it enables and activates the cold start strategy, and improves engine startability.High Coolant Temperature Alarm (if equipped)
The sensing element must be submerged in the coolant to operate properly. Ensure your