PREVOST X3-45 COMMUTER User Manual

SECTION 04 : EXHAUST AND AFTERTREATMENT
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 04 revised March 2021
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6. DIFFUSER ASSEMBLY
During stationary regeneration, exhaust gas
temperature may get very hot at the outlet. The
diffuser decreases the exhaust gas temperature
by about half at 6 inches above the diffuser. The
diffuser is an important component of the
exhaust system and must remain on the vehicle
at all times. Operating the vehicle without the
diffuser may seriously damage the vehicle.
FIGURE 10: DIFFUSER ASSEMBLY
6.1. DIFFUSER ADJUSTMENT
Should an adjustment of the diffuser position be
necessary, first remove the exhaust
aftertreatment roof ventilation grill.
CAUTION
To prevent paint damage and fiberglass
overheating caused by hot exhaust gases, the
diffuser louvered cover must be flush with the
roof surface or may not exceed the roof
surface more than 3/32 inch (2 mm).
CAUTION
Tighten clamps properly in order to prevent
any movement of the diffuser assembly. An
impact wrench is necessary.
1. Loosen the clamp securing the diffuser
assembly to the catalytic converter.
FIGURE 11: DIFFUSER POSITION ADJUSTMENT
2. For proper angular position, make sure that
the two edges shown on Figure 11 are
parallel with each other.
3. Using a straightedge, adjust the diffuser
assembly level. The top surface of the
warning plate fixed on the diffuser louvered
cover must be flush with the roof surface or
may exceed about 3/32in (2mm).
4. Tighten the clamp securing the diffuser
assembly to the catalytic converter.
5. Reinstall the EATS roof ventilation grill and
deflector.
6.2. MAINTENANCE
At vehicle inspection intervals, inspect the
diffuser assembly as follows:
• Inspect diffuser grille for stress cracking;
• Check for presence of foreign matter and
debris inside the diffuser housing, remove
and clean if applicable;
• 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;

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in