PREVOST X3-45 COMMUTER User Manual

SECTION 05: COOLING SYSTEM
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
13
FIGURE 16: VOLVO D13 THERMOSTAT HOUSING
3. Install the new thermostat. Make sure that the
rubber seal remains properly seated.
4. Position the thermostat housing to the
cylinder head, install the bolts and tighten.
TORQUE: 15-21 lb-ft (20-28 Nm)
5. Install the rubber radiator hose to the
thermostat housing. Position the clamp and
tighten to secure.
6. Fill the system with the recommended
coolant.
7. Start the engine, check for leaks and proper
operation. After shutdown, add fluids as
necessary.
5.2 CHECKING NEW THERMOSTAT
A function check must be carried out before
installing a new thermostat.
NOTE
Check to be sure that the new thermostat
closes fully. This can be done by holding it up
to the light to check that there is no visible gap
at the opening point. If the thermostat does not
close properly, replace it.
1. Warm up water in a receptacle to 167°F
(75°C) and immerse the thermostat in the
water. Use a piece of wire attached to the
thermostat.
2. After at least 30 seconds, check that the
thermostat is still closed.
3. Now warm the water to 212°F (100°C). After
at least 30 seconds at the boiling point,
check that the thermostat has opened at
least 9/32in (7mm). If the thermostat has not
opened, it must be replaced. A good
thermostat starts to close at 203°F (95°C)
and is fully closed at approximately 185°F
(85°C).
6. COOLANT
6.1 COOLANT LEVEL VERIFICATION
Cold engine coolant level is correct when coolant
level is visible between the two level marks on
the recovery tank (Figure 2 & Figure 17). If
coolant level is low, fill cooling system.
6.2 COOLANT LEVEL SENSOR
This warning device consists of 2 fluid level
sensors. The first sensor is mounted at the
bottom of the plastic recovery tank and warns
the driver that the engine coolant level as
reached the low level. Add coolant whenever
possible up to the recovery tank top fill line.
The second probe is mounted on the front of the
metal surge tank and warns the driver that the
engine coolant as reached the critically low level.
Stop the vehicle and add coolant to the recovery
tank (not surge tank).
NOTE
If the critically low coolant level is reached, the
“STOP ENGINE” lamp will illuminate, an alarm
will be heard and the engine will switch to
derate mode (50% torque reduction).
Special care must be taken to ensure proper
installation of these sensor (tank or sensor
replacement).
Recovery tank sensor, make sure that:
• Dot on the sensor body is pointing down.
• Loctite MR 5438 Plastic Pipe sealant is
applied to the threads.
• A maximum of one thread is visible once
tightened.

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