Starting and running Coolant temperature Normal coolant temperature during operation is 80-90°C/176-194°F. Oil pressure Information about the normal oil pressure and lowest permitted oil pressure is contained in the section headed Technical Data. Alarm levels are set in the engine control unit. The default setting for the lowest and highest limit values for high coolant temperature are 95°C/203°F and 105°C/221°F respectively. The engine management system has the follow- ing alarm levels: The following function is standard as alarm for high coolant temperature: At an engine speed below 1,000 rpm and an oil pressure below 0.7 bar/10.2 psi.
At an engine speed above 1,000 rpm and an oil pressure below 2.5 bar/36.3 psi for longer than 3 seconds. Alarm and torque reduction at the lowest lim- it value. Depending on the engine configuration, the fol- lowing alarm functions may also be available: The following function is standard as alarm for incorrect oil pressure: Alarm only. Alarm and engine shutdown at the highest limit value. Alarm, torque reduction at the lowest limit value and engine shutdown at the highest lim- it value. Alarm and engine shutdown at the highest limit value with the possibility of engine shut- down override control.
Alarm, torque reduction at the lowest limit value and engine shutdown at the highest lim- it value, with the possibility of engine shut- down override control. Alarm and torque reduction by 30%. Depending on the engine configuration, the fol- lowing alarm functions may also be available: Alarm only. Alarm and engine shutdown. Alarm and engine shutdown override control. Note: High oil pressure (above 6 bar/87 psi) is normal when starting a cold engine. If run for extended periods under an extremely light load, the engine may have difficulty in maintaining the coolant temperature. At an in- creased load the coolant temperature rises to the normal value. IMPORTANT!
An excessively high coolant temperature can damage the engine. OPM 300 en-GB 29 © Scania CV AB 2015, Sweden