NOTE: Rain or snow can wet the filter and
cause a temporary high reading.
Air intake restriction vacuum is measured in inches
of water (inH
2
O). For vehicles equipped with a
graduated indicator or a restriction gauge on the
dash, check the gauge with the engine off. If the yel-
low signal stays locked in the red zone once the en-
gine is shut down, or is at or above the values
shown in
Table 4.2
, the air cleaner element needs to
be replaced.
Vehicles may be equipped with a go/no-go restriction
indicator without graduations (see
Fig. 4.6
) instead of
a graduated indicator.
Air Intake Maximum Restriction Values (inH
2
O)
Engine Make
EPA10 Engines
GHG14 Engines
Cummins
25
25
Detroit
22
18
Table 4.2, Air Intake Maximum Restriction Values
Coolant Temperature Gauge
NOTICE
A sudden increase in coolant temperature may
indicate engine or cooling system failure. Bring
the vehicle to a safe stop and investigate the
cause to prevent further damage. Do not operate
the engine until the cause has been determined
and corrected.
During normal engine operation, the coolant tem-
perature gauge, as shown in
Fig. 4.7
, should read
175 to 195°F (79 to 91°C). If the temperature re-
mains below 160°F (71°C), inspect the cooling sys-
tem to determine the cause.
If coolant temperature rises above the maximum
temperature listed in
Table 4.3
, the CHECK engine
lamp will illuminate. If the condition does not im-
prove, the STOP engine lamp will also 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.
Maximum Coolant Temperature
Engine Make
Temperature: °F (°C)
Caterpillar
230 (110)
Cummins
225 (107)
Detroit
215 (101)
Mercedes-Benz
222 (105)
Table 4.3, Maximum Coolant Temperature
Drive Axle Oil Temperature Gauges
NOTICE
A sudden increase in oil temperature that is not
caused by a load increase may indicate mechani-
cal failure. Bring the vehicle to a safe stop and
investigate the cause to prevent further damage.
Do not operate the vehicle until the cause has
been determined and corrected.
During normal operation, drive axle oil temperature
gauges (see
Fig. 4.8
) should read between 160 and
220°F (71 and 104°C).
04/08/2005
f090431
Fig. 4.6, Manual-Reset Air Restriction Indicator, Go/
No-Go
10/09/2001
f610565
WATER
100
150
200
250
F°
Fig. 4.7, Coolant Temperature Gauge
Instruments
4.9
Summary of Contents for 108SD
Page 1: ...Driver s Manual 108SD and 114SD Part Number STI 496 Publication Number STI 496 6...
Page 60: ...7 Climate Control Climate Control Panel 7 1...
Page 65: ...8 Cab Features Cab Amenities 8 1 Mirrors and Windows 8 1...
Page 121: ...15 Drive Axles Differential Lock Drive Axles 15 1 Interaxle Lock Tandem and Tridem Axles 15 2...
Page 125: ...16 Steering System Power Steering System 16 1...
Page 179: ...05 13 2009 f545526 Fig 23 3 Headlight Adjusting Headlight Aiming 23 3...