Maintenance; Flexible Coupling Installation - PREVOST H3-41 Maintenance Manual

• Engine timing sensor;
• Engine coolant temperature;
• EGR temperature sensor.

1.4. MAINTENANCE

Inspect the exhaust system periodically for
restrictions and leaks. Figure 1 presents the
major components of the exhaust system.
Exhaust leaks are commonly the result of loose
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
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.
WARNING
Diesel engine exhaust and some of its
constituents are known to the State of
California to cause cancer, birth defects and
other reproductive harm.
that can cause
PA1621 Maintenance Manual All Series | Section 04 revised Feb 2019
SECTION 04 : EXHAUST AND AFTERTREATMENT
NOTE
INSULATING BLANKETS
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
regeneration, resulting
consumption due to overuse of active or
stationary regeneration.
Use of insulating blankets on the SCR
converter is no longer necessary on vehicles
equipped with engine compliant to OBD19.
1.5. FLEXIBLE COUPLING
INSTALLATION
The flexible coupling contains a rigid interior pipe
(Figure 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 be
transferred to the turbocharger.
FIGURE 2: FLEXIBLE COUPLING
during passive
in increased fuel
11