3818500 Volvo.Penta Retainer

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 cooling system is at the proper level.
The switch is located on the right rear of the cylinder block for 3408 engines and on the right rear of the cylinder block for 3412 engines. Excessive water temperature closes the switch. Maximum coolant temperature to trip alarm is 104°C (219°F). The switch opens as the coolant cools. No resetting procedure is required.Coolant Temperature Sensor Failure
When the sensor output is open, shorted to ground or supply, or measured coolant temperature reading is out of specification, a sensor failure may have occurred.The ECM will detect the coolant temperature sensor failure and through the diagnostic lamp warn the user of a coolant temperature sensor failure. The coolant temperature sensor related strategies will be disabled. The coolant temperature sensor failure will not cause an engine shut down, power derating, or any speed change.Low Coolant Level
The low coolant level sensor monitors engine coolant level to detect low engine coolant conditions and performs low coolant level diagnostic and annunciation.This feature also is used for engine system diagnostics. The output from the ECM can be used to drive a relay or a lamp to annunciate low coolant level conditions.Coolant Level Sensor Failure
When the sensor output is open, shorted to ground or supply, a sensor failure may have occurred.The ECM will detect low coolant level and through the low coolant warning lamp warn the pilot about the coolant level status. The coolant level sensor failure will not cause an engine shut down, power derating, or any speed change.Engine Oil Pressure
The sensor utilizes engine oil pressure and engine speed to perform low engine oil pressure detection for diagnostic and annunciation.The graph below illustrates the limits of low engine oil pressure diagnostic and annunciation. The output from the ECM can be used to drive a relay or a lamp to annunciate Low Oil Pressure conditions.
Oil Pressure ParametersLow Oil Pressure Alarm
Oil pressure sensor location.The sensor is mounted in the front of the engine cylinder block with oil lines connected to the switch. Low engine oil pressure closes the switch.The oil pressure switch senses oil pressure at the bearing oil gallery. No resetting procedure is required. Switches may close at 48 to 62 kPa (7 to 9 psi) below actual trip point.Oil Pressure Sensor Failure
When the sensor output is open, shorted to ground or supply, or measured oil pressure reading is out of specification, a sensor failure may have occurred.The ECM will detect the oil pressure sensor failure and through the diagnostic lamp warn the user about the oil pressure sensor failure. The oil pressure related strategies will be disabled. The oil pressure sensor failure will not cause an engine shut down, power derating, or any engine speed change.Speed Sensing Loss Alarm
When the engine speed sensor can no longer sense engine speed, an alarm and diagnostic code entry will occur. If the ECM can not detect any engine speed, the engine will shut down.Manual Fuel Shutoff Lever
Do not use the emergency shutoff control for a normal stopping procedure.
Manual shutdown shaft with lever location.A manual shutdown shaft is provided to override the governor solenoid. This shutdown will only move the fuel control linkage to the fuel OFF position to starve the engine of fuel. It does not shut off the air inlet.Engine Shutoff Controls
Secondary shutoff controls may be electrically, mechanically or hydraulically operated. 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.The shutoff controls should be tested every 1000 hours by authorized Caterpillar dealer personnel.Always determine the cause of the shutdown, and have the necessary repairs made before restarting the engine.Shutoff Solenoid Failure
When the shutoff solenoid output is open or shorted to ground or supply, a failure may have occurred.The ECM will detect ope