IMPORTANT: The aftertreatment device (ATD),
which is part of the aftertreatment system (ATS),
requires special attention during regularly
scheduled maintenance inspections; see
Fig. 4
.
No leaks are allowed anywhere in the system. If
any discrepancies are discovered, refer to the
engine manufacturer’s service literature for re-
pair instructions.
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.
NOTICE
A leak in the CGI piping, including the bellows,
will allow unfiltered air and contaminants into the
engine intake, and can cause serious engine dam-
age.
NOTE: Because the CGI bellows is covered
with a metal mesh, it is difficult to see cracks or
damage that may cause a leak.
3.
On vehicles with CAT engines, inspect the CGI
bellows and piping for evidence of damage or
leakage. See
Fig. 5
. If the bellows is damaged
or leaking, replace it. See
49–02
for the replace-
ment procedure.
08/20/2009
f490355
1
2
3
4
5
6
7
8
9
10
11
12
13
14
9
15
NOTE: The sensor box (item 8) contains the SCR inlet and outlet NOx sensors, DPF outlet pressure sensor, and the
DOC inlet pressure sensor.
1.
DOC Outlet Temperature
Sensor
2.
DOC Inlet Pressure Sensor
Port
3.
DOC Inlet Temperature Sensor
4.
Front Heat Shield
5.
DEF Nozzle
6.
Exhaust Outlet
7.
DEF Metering Unit
8.
Sensor Box (see note above)
9.
Exhaust Inlet
10. SCR Outlet Temperature
Sensor
11. SCR Outlet NOx Sensor Port
12. SCR Inlet NOx Sensor Port
13. 14-Pin Connectors
14. DPF Outlet Pressure Sensor
Port
15. SCR Inlet Temperature Sensor
Fig. 1, One-Box ATS Sensor Locations
Exhaust
49
Cascadia Maintenance Manual, November 2015
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