0303361 JOHNSON WASHER, Thrust

Alarm System Information
Alarm systems consist of a sensor and contactor. The sensor such as magnetic pickup for detecting speed, or pressure and temperature sensors are wired to a contactor which activates an alarm circuit in the Alarm Annunciator Panel. Alarm switches and sensors are set at a less critical temperature, level, or pressure than shutdown controls.The alarm annunciator panel has visual (light) and/or an audible system to warn the operator of a malfunction or abnormal engine operating condition. Each alarm contactor and switch is electrically connected to the visual or audible system. When an alarm is activated, corrective measures should be taken before the situation becomes an emergency. If corrective measures are not taken within a reasonable time, engine damage could result, or if equipped, a corresponding shutdown device will stop the engine.The alarm will continue until the condition is corrected or the alarm is silenced by the operator. The light will remain illuminated.The alarm circuits merely warn the operator, they do not shut the engine down to protect it from damage. The following examples are some of the typical switches used for alarms, which can vary from installation.Junction Box (If Equipped)
The junction box (module or remote mounted) is utilized to terminate all of the wiring to and from the alarm and shutdown components. It may also contain a fuel shutoff solenoid switch, an emergency stop pushbutton (ESPB), and circuit breakers which are used for circuit protection.The electrical system may be an energized-to-run (ETR) or an energized-to-shutdown (ETS) system. Refer to the Service Manual, OEM or governor manual for your particular electrical system schematics.Alarm System Sensors
The following are typical switches used for alarms and are optional for each installation.* Lubrication SystemLow Oil Pressure Alarm
The oil pressure switch senses oil pressure at the bearing oil gallery. The alarm is set at 120 20 kPa (17 2 psi) at LOW rpm (less than 650 rpm) and 320 20 kPa (46 2 psi) at HIGH rpm (greater than 650 rpm). No resetting procedure is required. The contactors are located next to the engine mounted junction box if equipped with the EGB-P type governor and inside the PGEV governor if equipped.Low Oil Level Alarm
The low oil level alarm switch, which is used to determine when the oil level is low, is mounted in the side of the crankcase sump. When the oil level is near the low level, oil must be added to the crankcase to fill to the proper sump level to reset the alarm and avoid possible engine damage.High Oil Temperature Alarm
The alarm switch senses oil temperature. The switch opens as the oil cools, and the annunciator panel has to be reset. The alarm is set to trip at 93 2°C (199 4°F).
The sensing elements must be submerged in the to operate. The alarm cannot actuate if the oil level is low.
Oil Mist Detector Alarm
This alarm monitors oil mist in the crankcase. High oil mist concentrations are detected and the alarm activated.* Cooling SystemEngine Coolant Temperature Alarm
This alarm is available as a High Coolant Temperature Alarm. The alarm switch senses water temperature. The switch opens as the coolant cools. No resetting procedure is required. The alarm is set to trip at 98 2°C (208 4°F).
The sensing elements must be submerged in the coolant to operate. The alarm cannot actuate if the coolant level is low.
Low Coolant Level Alarm
The cooling system tank can be equipped with a coolant level gauge, which is used to determine when the coolant level is low. When the coolant level is near the LOW mark, coolant must be added to the expansion tank to avoid engine overheating or possible engine damage.Low Jacket Water Pressure Alarm
This optional alarm is mounted at the jacket water pump outlet and is set at 35 20 kPa (5 3 psi).High Unit Injector Coolant Temperature Alarm
Injector tip cooling is used for heavy fuels above IBF40 viscosity. The set point is 85 2°C (185 4°F) measured after the injectors.Low Unit Injector Coolant Pressure Alarm
Injector tip cooling is used for heavy fuels above IBF40 viscosity. This optional alarm is mounted in the fuel manifold and is set at 260 20 kPa (38 3 psi).* Intake/Exhaust SystemExhaust Gas Alarm
An exhaust temperature sensor is mounted in the stack (after turbocharger) and the alarm set at 550 10°C (1022 18°F). The alarm will reset itself when the temperature is reduced.Individual Cylinder Exhaust Temperature Deviation Alarm
Industrial exhaust port temperature capability is available and the temperature deviation should not exceed 50°C (122°F).High Air Manifold Temperature Alarm
This optional temperature alarm is used for high ambient temperature applications. The alarm is set at 90 2°C (194 4°F).High Crankcase Pressure Alarm
Typical pressure readings should be 0.003 kPa (0.01 inch) H2O minimum to 1.0 kPa (4.0 inch) H2O maximum. The crankcase pressure alarm is set at 0.6 kPa (2.5 inch) H2O.* Fuel SystemLow Fuel Pressure Alarm
This optional alarm is mounted in the fuel manifold. It is set at 260 20 kPa (38 3 psi).Low Fuel Temperature to Engine Alarm
This optional temperature alarm is used to protect the fuel system when operating on heavy fuel. The alarm setting is viscosity dependent. The fuel viscosity should be 15 5 cSt with a maximum of 20 cSt.High Fuel Temperature to Engine Alarm
This alarm is used to protect the fuel system also. Power loss will occur when fuel temperatures are above 38°C (100°F). Maximum fuel temperature should not exceed 66°C (150°F).Emergency Engine Shutoff System Information
Engine shutdown systems utilize components which are set at a more critical operating temperature, pressure, level or speed than the alarm components to protect the engine from damage. When any of these components shut the engine down, the problem causing the shutdown must be corrected before attempting to restart the engine.The systems may be electrically, mechanically or hydraulically operated. It is equipped with electronic detection which actuates shutoff of fuel to the engine through the governor. It also actuates the air cylinder