C280-08 Marine Engine After Stopping Engine Caterpillar


After Stopping Engine
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1.1. Aftertreatment Purge Cycle
2.1. Shut down Procedure For the Oil Mist Detector

  • Check the engine crankcase oil level. Maintain the oil level between the "ADD" and "FULL" marks on the "ENGINE STOPPED" side of the oil level gauge.

  • If necessary, perform minor adjustments. Repair any leaks and tighten loose bolts.

  • Note the service hour reading. Perform the maintenance that is scheduled in this Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section).


NOTICE

Only use antifreeze/coolant mixtures recommended in the Refill Capacities and Recommendations section of this manual. Failure to do so can cause engine damage.


  • Allow the engine to cool. Check the coolant level.

  • If freezing temperatures are expected, check the coolant for protection against freezing. The cooling system must be protected against freezing to the lowest expected outside temperature. Add the proper coolant/water mixture, if necessary.

  • Perform all required periodic maintenance on all driven equipment. Refer to the instructions that are provided by the OEM of the driven equipment.

Aftertreatment Purge Cycle

Note: Air supply must remain active while the system purges.

Under certain conditions the aftertreatment control system will run the DEF dosing system through a DEF purging cycle. This purge cycle will drain the AUS/DEF line between the dosing cabinet and the DEF injector. The purge cycle is designed to protect the AUS/DEF system, and to prevent the AUS/DEF from freezing. The purge cycle also protects engine exhaust hardware from AUS/DEF leaking from the DEF injector. The system will enter purge mode when the engine speed has dropped below a set threshold. The system will also enter a purge cycle if certain codes are logged during operation.

During purge cycle, the AUS/DEF return valve on the AUS/DEF manifold will open and the dosing pump is turned off. The purge cycle will allow the air pressure in the line to force remaining AUS/DEF in the nozzle/line back to the tank inside the dosing cabinet. The purge cycle is a time-based event. The event should take less than 2 minutes.

Note: If DC power is turned off before the purge cycle has been completed, the system will display a 3362-31: Aftertreatment #1 DEF Dosing Unit Input Lines upon start up.

Shut down Procedure For the Oil Mist Detector

If a shutdown occurs due to excessive oil mist, use the following procedure.

    Note: Instructions from the Service Manual, "Disassembly and Assembly" module will be necessary in order to perform this procedure.

  1. After the shutdown, inspect the control system for other alarm conditions. Compare the timing of the shutdown to the activation of the alarm. Ensure that the shutdown was initiated by the oil mist detector.

  2. Inform the master engineer that the engine is unavailable.

  3. Inspect the display of the oil mist detector in order to ensure that the shutdown is genuine. The green "Ready" indicator is OFF and the red "Alarm" indicator is FLASHING. Inspect the display for other faults.

  4. After verifying the cause of the shutdown, shut off the air supply to the starting motor. This procedure will prevent accidental starting.

  5. Open the cylinder pressure valves (Kiene valves) for all of the cylinders.

    ------ WARNING! ------

    Guards must be in place prior to operating barring device motor.

    Remove all hand tools prior to operating barring device motor.



    NOTICE

    Do not use an impact wrench to operate the barring device. The use of an impact wrench will cause gear tooth failure.


  6. Operate the prelube pump and the barring device. If the flywheel will rotate freely, rotate the engine for two complete revolutions (720 degrees). Lock the barring device.

  7. Deactivate the prelube pump.

    ------ WARNING! ------

    Flash fire may result in personal injury, if crankcase covers are removed within fifteen minutes after emergency shut down. Do not restart engine until cause for shutdown has been corrected.


  8. After the engine has been shut down for 15 minutes, remove all of the crankcase covers. The oil mist detector monitors each section of the crankcase. First investigate the section with the fault condition.

    Note: Measure the temperatures quickly before the bearings can cool is important. This procedure will provide the most accurate indication of the operating temperatures of the bearings. Step 9 can be efficiently performed by two people: one person measures the temperatures, and one person records the temperatures.

  9. Use a 123-6700 Laser Infrared Thermometer. Record all three temperatures for the small end bearing and for the large end bearing of each connecting rod. Record the temperatures for the front, the center, and the rear of each bearing.

      Note: Lower temperatures can be expected for a shutdown during partial load operation.

    1. The temperature of any small end bearing should not exceed the average temperature of all of the small end bearings by more than 15 °C or 27°F. The temperature of any large end bearing should not exceed the average temperature of all of the large end bearings by more than 15 °C or 27°F.

    2. The maximum temperature of any bearing after full load operation should not exceed 105 °C (221 °F).

  10. Ensure that the large end bearings of the connecting rods can move freely. Normally, the rods can be moved slightly. Move the rods back and forth along the crankshaft journal.

  11. If the following conditions occur, perform Steps 11.a and 11.b:

    • The temperatures are within the specifications that are listed in Steps 9.a and 9.b.

    • A closer visual inspection shows no damage to the following components: pistons, cylinder liners, piston pins, main bearings and gear trains.

    1. Remove the oil filters. For instructions, see this Operation and Maintenance Manual, "Engine Oil Filter - Change" topic (Maintenance Section).

    2. Cut the oil filters open with a utility knife. Inspect the pleats of the filter material for debris. The type of debris that is found will indicate components that require further inspection.

  12. If the temperatures of the bearings exceed the specifications that are listed in Steps 9.a and 9.b, remove the components that are affected. Perform a full inspection of the components.

  13. When the engine is in satisfactory condition, perform a complete inspection of the oil mist detector. For instructions, see the literature that is provided by the OEM of the detector.


    NOTICE

    Do not operate the engine starting motor until the barring group pinion gear is fully disengaged from the flywheel ring gear. Serious damage to the engine could result.


  14. Start the engine according to this Operation and Maintenance Manual, "Engine Starting" topic (Operation Section). Operate the engine at low idle rpm for 10 minutes. If the oil mist detector causes another shutdown, repeat this entire procedure.

  15. After the engine has operated with no problem for 10 minutes, stop the engine. Immediately remove all of the crankcase covers. Measure the temperatures of the connecting rod bearings. This procedure will verify the correct operation of the engine.

  16. Resume normal operation.

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