ENGINE OPERATION - Emergency - What To Do If atures can decrease engine tempera- ture and could cause engine damage from inadequate lubrication. The nor- mal torsional vibrations generated can also cause transmission wear. An idle shutdown feature, available on PAC- CAR engines, can be programmed to shut the engine down after a period of low idle operation with no driver activi- ty. A flashing warning lamp will inform the driver of an impending shutdown. Failure to comply may result in equip- ment or property damage. 4. Increase the engine speed to about one-half of full operating speed, or 1,100 to 1,200 rpm, maximum for 2 or 3 minutes. 5. Return the engine speed to normal idle.
Monitor the engine temperature. After the temperature returns to normal, allow the engine to idle 3 to 5 minutes before shutting it off. This allows the engine to cool gradually and uniformly. 6. If overheating came from severe operating conditions, the temperature should have cooled by this time. If it has not, stop the engine and let it cool before checking to see if the coolant is low. 7. Be sure the vehicle is parked on level ground or the readings may be incorrect. Check the coolant level at the cooling module surge tank. Check the coolant level after each trip when the engine has cooled. The coolant level should be visible within the surge tank —add coolant if necessary.
1 WARNING Removing the fill cap on a hot engine can cause scalding coolant to spray out and burn you badly. If the engine has been in operation within the previ- ous 30 minutes, be very careful in re- moving the fill cap. Protect face, hands, and arms against escaping flu- id and steam by covering the cap with a large, thick rag. DO NOT try to re- move it until the surge tank cools down or if you see any steam or coolant es- caping. In any situation, remove the cap very slowly and carefully. Be ready to back off if any steam or coolant be- gins to escape.
CAUTION If the truck is equipped with power take off (PTO) equipment, the engine shutdown system can be deactivated when the PTO is operational; however, engine idle periods should not exceed five minutes whenever possible. Fail- ure to comply may result in equipment or property damage. NOTE Keep the engine running at idle speed unless a warning icon turns on and re- quires an engine to be shut off. CAUTION 2. Check to ensure the Oil Pressure Gauge reads normal. 3. Make sure the engine fan is turning by switching the Engine Fan Switch from AUTO to MAN (Manual). Prolonged periods of idling after the engine has reached operating temper- Y53-1181-1K1 (08/2018) 13