air dryer, it will not remove the water from the air
brake system, which could adversely affect brak-
ing.
1.
Drain the brake system air reservoirs (reservoirs
without automatic drain valves only).
WARNING
Never operate the engine with the fuel tank shut-
off valves partially closed. This could damage the
fuel pump, causing sudden loss of engine power,
possibly resulting in serious personal injury due
to reduced vehicle control.
2.
Ensure fuel tanks are secured to their mounting
brackets and that the mounting brackets are se-
cured to the frame.
If equipped with fuel tank shutoff valves, be sure
the valves are fully open.
3.
Inspect visible frame rails for missing bolts, shiny
areas, or rust streaks. Check all visible cross-
members for damage or signs of looseness.
4.
Inspect visible components of the exhaust sys-
tem to ensure connections are tight.
Inspect upstream of the aftertreatment device
(ATD), if equipped, for cracking or signs of leaks,
such as soot trails. Inspect downstream of the
ATD for signs of exhaust leaks, such as blister-
ing or warping of nearby components.
NOTICE
Failure to maintain a sealed air intake system
could allow the entry of dirt and contaminants
into the engine. This could adversely affect en-
gine performance and result in engine damage.
5.
Inspect the air intake system for leaks or dam-
age. Ensure the snorkel intake is free of debris, if
equipped.
Push the reset button on the air intake restriction
indicator located on the air cleaner, if equipped.
Forward Engine Compartment
Inspection
Open the grille. See Chapter 2 for instructions.
1.
Check the ground underneath the engine for fuel,
oil, or coolant leaks.
2.
Check the engine oil level.
NOTICE
Operating the engine with the oil level below the
minimum fill (or "add") mark or above the maxi-
mum fill (or "full") mark could result in engine
damage.
2.1
Check the oil level with the vehicle parked
on a level surface. See Fig. 23.6. See the
engine manufacturer’s guidelines for en-
gine shutdown time requirements prior to
checking the oil level.
IMPORTANT: On engines that are equipped
with an exhaust aftertreatment system
(ATS), use engine oil with less than 1% sul-
fated ash.
2.2
If the oil level is at or below the minimum
fill (or "add") mark on the dipstick, add
enough oil to maintain the level between
the minimum and maximum fill marks. See
the engine operation manual for recom-
mended lubricants.
NOTICE
Low coolant could result in engine overheating,
which could cause engine damage.
05/18/98
1
2
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1. Dipstick 2. Coolant Fill Cap
Fig. 23.6, Oil Level Checking
Pre- and Post-Trip Inspections and Maintenance
23.4
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