Maintenance; Diffuser Extension - (H3-45 Vip / X3-45 Vip); Diesel Exhaust Fluid (Def) Tank And Injection System; Diesel Exhaust Fluid - PREVOST H3-41 Maintenance Manual

SECTION 04 : EXHAUST AND AFTERTREATMENT
• Check for proper functioning of the rain cap
inside the diffuser housing, make sure that it
moves freely;
• Make sure that the water drain tube is not
clogged. Pour a cup of water into the diffuser
housing and assure that all the water is
drained at once at the other end of the drain
tube. If tube is clogged, remove tube and
blow compressed air inside, in reverse flow;
• Check that the warning plate
SURFACE MUST BE FLUSH WITH THE ROOF
is still in place.
SURFACE"

MAINTENANCE

Diffuser assembly
Inspect the diffuser assembly at the intervals
specified by the Lubrication And Servicing
Schedule in Section 24: LUBRICATION &
SERVICING.
1.11. DIFFUSER EXTENSION –
(H3-45 VIP / X3-45 VIP)
A diffuser extension is available for converters.
To install:
1. Remove the existing diffuser louvered cover;
2. Mount the extension on the diffuser housing.
Secure with the 10 existing nuts;
3. Slide the heat shield over the extension;
4. Place the diffuser louvered cover over the
assembly and secure with a second set of 10
identical nuts.
FIGURE 9: DIFFUSER EXTENSION
20 PA1621 Maintenance Manual All Series | Section 04 revised Feb 2019
"THIS DIFFUSER
04021
FIGURE 10: DIFFUSER EXTENSION FOR
MOTORHOMES
6. DIESEL EXHAUST FLUID (DEF) TANK
AND INJECTION SYSTEM
The DEF tank and injection system control unit
continuously vary the amount of DEF injected in
response to the engine's current load conditions.
Diesel Exhaust Fluid (DEF) is stored in a 16
gallons (60 liters) plastic tank located curb side,
in the condenser compartment.
A pump located beside the DEF tank is used to
pressurize the system and deliver the fluid.
A heating coil inside the tank uses engine
coolant to keep the DEF in a liquid state or to
melt DEF at engine start up during cold season.
DEF is injected into the exhaust gases through
an injection nozzle located between the DPF and
the catalytic converter (refer to Figure 1).
In the catalytic converter, nitrogen oxides are
transformed into harmless nitrogen gas and
water.
The system notifies the driver when it is time to
top up with DEF.

1.12. DIESEL EXHAUST FLUID

When handling DEF solution, it is important that
electrical connectors to be connected or well
encapsulated, otherwise there is a risk that the
DEF will cause oxidation that cannot be
removed. Water or compressed air will not help,
since DEF quickly oxidizes certain metals. If a
disconnected connector comes into contact with
the DEF solution,
immediately to prevent the DEF solution from
creeping further into the copper wiring, which
takes place at a speed of about 2.4 in (60 mm)
per hour.
it must be replaced