Maximum Coolant Temperature
Engine Make Temperature: °F (°C)
Detroit Diesel 215 (101)
Table 4.2, Maximum Coolant Temperature
Engine Oil Pressure Gauge
NOTICE
A sudden decrease or absence of oil pressure
may indicate mechanical failure. Bring the vehicle
to a safe stop and investigate the cause to pre-
vent further damage. Do not operate the engine
until the cause has been determined and cor-
rected.
The engine oil pressure gauge displays the current
engine oil pressure. If engine oil pressure falls below
the minimum levels shown in
Table 4.3, the CHECK
engine lamp will illuminate. If the condition does not
improve, the STOP engine lamp will illuminate and
an audible warning will sound. The engine will then
derate or shut down, depending on the type of en-
gine protection system installed.
Minimum Engine Oil Pressure
*
Engine Model
At Idle Speed:
psi (kPa)
At Rated RPM:
psi (kPa)
Cummins 15 (103) 35 (241) min.
Detroit Diesel 14 (97) min. 55 (350) min.
*
Pressures apply with the engine at operating temperature. Oil pressure
may be higher on a cold engine. Observe and record pressures when the
engine is new to create a guide for checking engine condition.
Table 4.3, Minimum Engine Oil Pressure
Fuel/Diesel Exhaust Fluid (DEF)
Gauge
The fuel and DEF levels are measured in a dual pur-
pose fuel/DEF gauge. See
Fig. 4.13.
The diesel fuel level is indicated at the top of the
gauge, with a low-fuel warning lamp that illuminates
when the diesel fuel level registers 1/8th of capacity.
The DEF level is indicated in the lightbar on the
lower portion of the gauge. There is a low DEF level
warning lamp that illuminates when the DEF level
reaches 10% of capacity. See
Chapter 11 for details
of the exhaust aftertreatment system.
Primary and Secondary Air Pressure
Gauges
WARNING
If air pressure falls below minimum pressure, the
braking ability of the vehicle will be limited. Slow
the vehicle down and bring it to a gradual stop.
Do not attempt to move the vehicle until air pres-
sure has risen above the minimum level. Moving
a vehicle without adequate braking power could
cause an accident resulting in property damage,
personal injury, or death.
Air pressure gauges register the pressure in the pri-
mary and secondary air systems. Normal pressure
with the engine running is 100 to 120 psi (689 to 827
kPa) in both systems.
A low air pressure warning lamp and audible warn-
ing, connected to both the primary and secondary
systems, activate when air pressure in either system
drops below a minimum pressure of 64 to 76 psi
(441 to 524 kPa).
When the engine is started, the warning light and
buzzer remain on until air pressure in both systems
exceeds minimum pressure.
08/21/2009
1/2
ULTRA LOW SULFUR
DIESEL FUEL ONLY
EF
DEF
FE
f611045
1
2
3
4
1. Diesel Fuel Level Indicator
2. DEF Level Indicator
3. Low DEF Warning Lamp (amber below 10% DEF)
4. Low Fuel Warning Lamp (amber at 1/8 tank of fuel)
Fig. 4.5, Fuel/DEF Gauge
Instruments
4.9
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