OPM 320 en-GB
18
©
Scania CV AB 2019, Sweden
Starting and running
Running
Check instruments and warning lamps at regular
intervals.
Engine speed range
The engine operating speed range is between low
idling and the nominal engine speed. The nomi-
nal engine speed is 1,500 or 1,800 rpm. Low
idling is normally 1,000 rpm.
Driving at high altitude
When driving at high altitudes engine power is
reduced automatically due to the lower oxygen
content in the air. It is then not possible to run the
engine at maximum power.
Note:
Driving at a height higher than 2,000 metres
above sea level is only permitted if it has first
been approved by Scania.
Coolant temperature
IMPORTANT!
An excessive coolant temperature can cause en-
gine damage.
Normal coolant temperature during operation is
90-95°C (194-203°F).
Alarm levels are set in the engine control unit.
The default setting for the lowest and highest
limit values for high coolant temperature are
98°C (208°F) and 105°C (221°F) respectively.
The high coolant temperature alarm has the fol-
lowing functions:
• Alarm at the lowest limit value.
• Alarm at the lowest limit value and engine
shutdown at the highest limit value.
The engine is designed and optimised for contin-
uous operation at 100% load. To ensure opera-
tional reliability and to extend the maintenance
intervals, the following limitations for load and
operating time apply:
The accumulated total engine operating time at
less than 25% load should be < 5%.
The accumulated total engine operating time of
the engine at less than 40% load should be
< 15%.
Oil pressure
For information on the normal oil pressure and
lowest permitted oil pressure, see the
section.
The engine management system activates an
alarm for high or low oil pressure at engine
speeds above 650 rpm. The values below are for
overpressure, not absolute pressure.
• An alarm for high oil pressure is activated
when the pressure exceeds 7.9 bar (115 psi).
• An alarm for low oil pressure is activated
when the oil pressure drops below 0.65 bar
(9 psi).
The incorrect oil pressure alarm has the follow-
ing functions:
• Alarm only.
• Alarm and engine shutdown.
Note:
High oil pressure (above 6 bar/87 psi) is normal
if the engine is cold when started.
Output at 100% PRP
Max. operating time
0-25% load
30 minutes
25-40% load
120 minutes
More than 40% load
No restrictions.
