Charge Air Cooler (Cac) In Vehicle Removal - PREVOST H3-41 Maintenance Manual

SECTION 05B: X3 SERIES COOLING SYSTEM
32. Slide back the cooling assembly into
position and reverse removal procedure to
reinstall in vehicle.
33. Make sure that there is no conductivity
between the CAC/radiator units and the
cooling pack frame (see note at the
beginning of paragraph 11.4).
34. Fill the vehicle cooling system.
35. Set starter selector switch to the ON
position, start the engine and check for
coolant leaks.
11.5 CHARGE AIR COOLER (CAC) IN
VEHICLE REMOVAL
In the event that the charge air cooler (CAC)
would require replacement or in cases where
access to the engine
turbocharger would be required. It is possible to
remove the CAC from the vehicle without
removing the complete cooling pack thereby
eliminating the need to drain and refill the
vehicle cooling system.
NOTE
Spec for CAC acceptable leakage:
The CAC is considered acceptable if it can
hold 30 psi (206 kPa) gauge pressure with
less than 1 psi (6.9 kPa) loss in 60 seconds.
This spec does not apply if there is any
evidence that the leak was caused by a
foreign object impact.
1. Open rear engine compartment door.
2. Set starter selector switch to the OFF
position.
3. Proceed to the cooling fan shroud removal
following paragraph 11.3 of this section.
4. Disconnect the lower CAC pipe.
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PA1621 Maintenance Manual All Series
hot side and/or
|
January 2017
5. Disconnect the upper CAC pipe at the
middle section junction, also loosen the
hose clamps at the CAC connection and
pivot down the pipe to clear radiator.
FIGURE 34: CAC UPPER PIPE
6. Unscrew the upper cooling pack support
from the vehicle structure (CAC side support
only).
FIGURE 35: UPPER SUPPORT (CAC SIDE)