the required torque. If leakage persists, install a
new clamp.
49–02 CAT CGI Bellows and
Piping Inspection
On vehicles with CAT engines, inspect the CGI bel-
lows and piping for evidence of damage or leakage.
See
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.
1.
If the bellows is damaged or leaking, replace it.
See
for the replacement procedure.
2.
Check the CGI piping and each exhaust seal
clamp for leakage, wear, cracks, or damage. Re-
place damaged components as needed. If leak-
age exists at a clamp, tighten the nuts to the re-
quired 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. If any of the components is
damaged or leaking, replace it. See
for
the replacement procedure.
09/16/2009
f490354
1
2
3
4
5
6
7
8
9
10
11
1.
DPF Inlet Temperature Sensor
2.
DOC Inlet Temperature Sensor
3.
DOC Inlet Pressure Sensor
4.
DPF Sensor Box
5.
DPF Outlet Pressure Sensor
6.
DPF Outlet Temperature
Sensor
7.
DPF Outlet NOx Sensor
8.
SCR Inlet Temperature Sensor
9.
SCR Outlet Temperature
Sensor
10. SCR Sensor Box
11. SCR Outlet NOx Sensor
Fig. 3, 2HV Two-Box ATS Sensor Locations
Exhaust
49
Business Class M2 Maintenance Manual, November 2015
49/5
Property of American Airlines
