Inspection
Model year 2007 and later diesel engines in vehicles
domiciled in the U.S. or Canada are required to meet
all EPA exhaust gas emission regulations effective
per the applicable emission model year and are
equipped with an emission aftertreatment system
(ATS).
Vehicles domiciled outside of the U.S. and Canada
may not have aftertreatment equipment, depending
upon local statutory emissions guidelines.
IMPORTANT: The aftertreatment device (ATD),
which is part of the aftertreatment system (ATS),
requires special attention during regularly
scheduled maintenance inspections. No leaks
are allowed anywhere in the system. If any dis-
crepancies are discovered, refer to the engine
manufacturer’s service literature for repair in-
structions. Also see the engine manufacturer’s
maintenance literature for maintenance proce-
dures not listed here.
1. Check for leakage at the clamp that attaches the
exhaust pipe to the turbocharger exhaust outlet.
If leakage exists, tighten the nut on the clamp to
the required torque. If leakage persists, install a
new clamp.
2. Check the exhaust pipe, bellows, and each ex-
haust seal clamp for leakage, wear, cracks, or
damage. Replace damaged components as
needed. If leakage exists at a clamp, tighten the
nuts to the required torque. If leakage persists,
install a new exhaust seal clamp. Do not reuse
seal clamps. Once a seal clamp is loosened or
removed, it must be replaced.
3. If present, check the condition of the insulation
material around the exhaust pipe between the
turbocharger and the ATD.
4. Check the ATD mounting bands for tightness, if
installed. Tighten to 30 lbf·ft (41 N·m) if needed.
Do not overtighten.
5. Check for leaks around the clamps that attach
the ATD in the ATS, and around the clamps that
retain the DPF in the ATD.
NOTE: Diesel exhaust fluid creeps, causing
white crystals to form around the line fittings.
The presence of crystals does not mean the
system has a leak. Replacing fittings or trouble-
shooting components is not necessary unless
there is a system failure or a fault code.
6. Check the DEF tank, pump, metering unit, and
lines for leaks. See Section 49.01 of the 108SD
and 114SD Workshop Manual for repair proce-
dures.
7. Check any wires, lines, or hoses within 4 inches
(10 cm) of the exhaust system for heat damage.
Repair or reroute as needed.
Diesel Exhaust Fluid (DEF) Filter
Replacement
The Environmental Protection Agency’s 2010 regula-
tions require lower nitrogen oxide (NOx) exhaust
emissions. Selective catalytic reduction (SCR) uses
diesel exhaust fluid (DEF) to lower NOx emissions in
the vehicle exhaust. A filter in the DEF pump pre-
vents clogging of the DEF metering unit injection
nozzle.
See the engine manufacturer’s maintenance manual
for filter replacement intervals; and see Section
49.01 of the 108SD and 114SD Workshop Manual
for the filter replacement procedure.
Exhaust49
108SD and 114SD Maintenance Manual, December 201549/2
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