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

SECTION 05: COOLING SYSTEM
67. Slide back the cooling assembly into position
and reverse removal procedure to reinstall in
vehicle.
68. 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).
69. Fill the vehicle cooling system.
70. Set engine stop button to the ON position
(depressed), start the engine and check for
coolant leaks.
11.6 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 engine stop button to the OFF position
(push).
3. Proceed to the cooling fan shroud removal
following paragraph 11.3 of this section.
4. Disconnect the lower CAC pipe (directly at
the CAC connection or at the turbo
connection).
40
PA1621 Maintenance Manual All Series
hot side and/or
|
Section 05 revised Feb 2019
5. Disconnect the upper CAC pipe: On the X3
Series, it is possible to disconnect the pipe
middle section junction and loosen the hose
clamps at the CAC connection to pivot down
the pipe (to clear radiator). The H3 Series
upper CAC pipe is a one piece unit and must
be disconnected
connection.
FIGURE 58: ROTATE CAC UPPER PIPE (X3 SERIES
ONLY)
6. Unscrew the upper cooling pack support
from the vehicle structure (CAC side support
only).
FIGURE 59: UPPER SUPPORT (CAC SIDE)
directly at the CAC