SECTION 04: EXHAUST AND AFTERTREATMENT SYSTEM
6
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
For proper DPF assembly installation, inlet
and outlet alignment is important. When
reassembling the DPF, a straight edge must
be used to align inlet and outlet.
10. Torque V-band clamps to 20 lbf-ft;
CAUTION
Always torque clamps by hand.
11. With a rubber mallet, hit clamps forcefully
around circumference to make sure gasket
is fully seated;
12. Support Diesel Oxidation Catalyst (DOC)
and Diesel Particulate Filter (DPF) assembly
during reinstallation;
13. Reconnect pressure, NOx and temperature
sensors;
14.
Fasten straps holding DOC and DPF
assembly;
15. Put insulating blanket back.
3. CATALYTIC
CONVERTER
In the first instance, the catalytic converter of the
Selective Catalytic Reduction (SCR) does not
need any maintenance. Unless an accident or
damage occurs in the vicinity of the engine
compartment; the catalytic converter will not
have to be replaced.
However if the catalytic converter must be
replaced, use one of the two following
procedures:
3.1 REMOVAL
Procedure # 1
Radiator must be removed in order to lower the
catalytic converter for replacement.
Set the starter selector switch to the
OFF
position.
Shut off the heater line shut-off valves.
Using the quick-connect drain hose, drain
the engine cooling system. Refer to Section
05, COOLING under "DRAINING COOLING
SYSTEM".
CAUTION
Tag hoses and cables for identification before
disconnecting in order to facilitate re-
installation. Plug all openings to prevent dirt
from entering the system.
Disconnect and remove section of coolant
pipe assembly mounted between the
radiator outlet and the water pump inlet.
FIGURE 5: CATALYTIC CONVERTER
Disconnect and remove a section of coolant
pipe assembly mounted between the
thermostat housing and the radiator inlet.
Disconnect the electric fan-clutch connector
located near the cooling fan right angle
gearbox.
Disconnect and remove the air intake duct
mounted between the turbocharger outlet
and the air cooler inlet.
Open radiator door. Unfasten bolts and
screws fixing radiator sealing frame.
Remove radiator and air cooler assembly.
