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.
Engine Compartment Inspection
1.
Check the ground underneath the engine for fuel,
oil, or coolant leaks.
2.
Inspect the air intake system for leaks or dam-
age.
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.
2.1
Push the reset button on the air intake
restriction indicator located on the air
cleaner, if equipped.
2.2
Check the air intake duct from the air
cleaner to the engine intake. Make sure
the duct components are secure and air-
tight.
3.
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.
3.1
Check the oil level with the vehicle parked
on a level surface. See the engine manu-
facturer’s guidelines for engine shutdown
time requirements prior to checking the oil
level.
IMPORTANT: On engines that comply with
EPA10 or newer regulations, use CJ-4 en-
gine oil with less than 1% sulfated ash. Fail-
ure to use CJ-4 oil may void the warranty on
emission aftertreatment components.
3.2
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.
4.
Check the power steering reservoir fluid level.
The power steering fluid level should be between
the MIN COLD mark and the middle mark just
above it. See
Fig. 20.4. If needed, fill the reser-
voir with automatic transmission fluid that meets
Dexron III or TES-389 specifications.
NOTICE
Low coolant could result in engine overheating,
which could cause engine damage.
IMPORTANT: The surge tank must be cool to
check the coolant level.
5.
Check the engine coolant level in the radiator
surge tank. See
Fig. 20.5.
Pre- and Post-Trip Inspections and Maintenance
20.4
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