PREVOST X3-45 2016 Maintenance Manual Download

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SECTION 04: EXHAUST AND AFTERTREATMENT SYSTEM

PA1593

clamp bolts, corroded or punctured pipes. In
addition to excessive noise, a leaking exhaust
system could allow toxic gases to enter the
vehicle. Damage to surrounding components
from hot gases could result as well. Replace
damaged or corroded exhaust components
immediately.
Inspect the exhaust system as follows:



At vehicle inspection intervals ;



Whenever a change is noticed in the sound

of the exhaust system ;



When components close to the exhaust

system get unnaturally dirty ;



Whenever the exhaust system is damaged.

Replace damaged or corroded exhaust system
components without delay.

When operating the engine in a service garage or
in a closed area, the exhaust must be vented to
the outside. Place the shop vent hose over the
exhaust outlet pipe.

DANGER

Avoid breathing exhaust gases since they
contain carbon monoxide which is odorless
and colorless but harmful. Carbon monoxide is
a dangerous gas that can cause
unconsciousness and can be lethal. If, at any
time you suspect that exhaust fumes are
entering the vehicle, locate and correct the
cause(s) as soon as possible.

NOTE

The key to successful regeneration is high
exhaust temperature for an extended period of
time. For this reason, insulating blankets must
remain permanently on the exhaust system.

If insulating blankets are removed from the
system, the exhaust gases temperature may
not be high enough to permit efficient
particulate oxidation during passive
regeneration, resulting in increased fuel
consumption due to overuse of active or
stationary regeneration.

1.2 FLEXIBLE COUPLING INSTALLATION

The flexible coupling contains a rigid interior
pipe (Fig. 2). To allow appropriate flexibility once
installed, be sure interior pipe is concentric to

flexible part and that the flexible coupling is
straight when installed. This piece of equipment
handles vibration and thermal expansion.

CAUTION

Adequately support the exhaust system line.
The load of the exhaust line

must not

transferred to the turbocharger.

FIGURE 2: FLEXIBLE COUPLING

04022

DIESEL PARTICULATE FILTER (DPF)

Besides trapping soot, the

DPF

(

Diesel

Particulate Filter

) also traps the ash that has

been generated when additives in engine oil are
burned. However, unlike soot, ash cannot be
oxidized. The ash that accumulates in the filter
will eventually cause an increase in exhaust
back pressure. EMS will constantly monitor the
ash accumulation and forecast the approximate
time until DPF ash cleaning is required. This
allows you the opportunity to plan for the DPF
ash cleaning interval. If ash cleaning is not
performed proactively, and the back pressure
increases beyond the system limit, EMS will flag
the amber warning light on the telltale panel,
notifying the operator that an ash cleaning is
required. Clean remanufactured DPF cartridge
will be available through Prevost on an
exchange basis. For most commuter vehicle
applications and duty cycle, this will occur after
approximately 4500 hours of operation.

WARNING

HOT SURFACES

Keep yourself clear of hot Aftertreatment
System surfaces, particularly during and after
active or stationary regeneration. Hot surfaces
can cause serious burns.

PREVOST X3-45 2016, Maintenance Manual

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