PREVOST X3-45 COMMUTER User Manual

SECTION 05: COOLING SYSTEM
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
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9.2 REVERSE FLUSHING
After the engine and radiator have been
thoroughly de-scaled, they should be reverse-
flushed. The water pump should be removed
and the radiator and engine reverse-flushed
separately to prevent dirt and scale deposits
from clogging the radiator tubes or being forced
through the pump. Reverse flushing is
accomplished by hot water, under pressure,
being forced through the cooling system in a
direction opposite to the normal flow of coolant,
loosening and forcing deposits out.
The radiator is reverse flushed as follows:
1. Remove the radiator inlet and outlet hoses
and replace existing radiator cap with a new
one.
2. Attach a hose to the top of the radiator to lead
water away from the engine.
3. Attach a hose at the bottom of the radiator
and insert a flushing gun in the hose.
4. Connect the water hose of the gun to the
water outlet and the air hose to the
compressed air outlet.
5. Turn on the water and when the radiator is
full, turn on the air in short blasts, allowing the
radiator to fill between blasts.
NOTE
Apply air gradually. Do not exert more than
138 kPa (20 psi) air pressure. Too great a
pressure may rupture a radiator tube.
6. Continue flushing until only clean water is
expelled from the radiator.
The cylinder block and cylinder head water
passages are reverse flushed as follows:
1. Remove the thermostats and the water
pump.
2. Attach a hose to the water inlet of oil cooler
housing to drain water away from engine.
3. Attach a hose to the water outlet at the top of
the cylinder head (thermostat housing) and
insert the flushing gun in the hose.
4. Turn on the water until the jackets are filled,
and then turn on the air in short blasts. Allow
jackets to fill with water between air blasts.
5. Continue flushing until the water from the
engine runs clean.
10. SPIN-ON COOLANT FILTER
The engine cooling system filter is used to filter
out impurities such as scale or sand from the
coolant. The filter is mounted on the frame below
the turbocharger inlet tube (Figure 21).
To replace a filter:
1. Close the filter shutoff cock on the filter
mounting head and unscrew the old filter
from mounting.
WARNING
Failure to relieve cooling system pressure may
result in personal injury.
2. Remove and discard the filter. Recover the
coolant remaining in the filter with a suitable
container.
3. Clean the filter adapter with a clean, lint-free
cloth.
4. Coat surface of gasket with clean antifreeze,
tighten 2/3 to 1 turn after gasket makes
contact with head.
5. Open the filter shutoff cock.
6. Start engine and check for leaks.
MAINTENANCE
Coolant filter
Replace the coolant filter cartridge
at the
intervals specified by the Lubrication And
Servicing Schedule in Section 24:
LUBRICATION & SERVICING.
Do not exceed recommended service intervals.
FIGURE 21: COOLANT FILTER

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