PREVOST X3-45 Multiplex - Installation; Maintenance; Constant-Torque Hose Clamps on Charge Air Cooler (Cac)

Section 05: COOLING SYSTEM
PA1562
6
FIGURE 6: COOLANT FLOW TO RADIATOR (DDC S60)
05133
FIGURE 7: COOLANT FLOW TO RADIATOR (VOLVO D13)
3.1.1 Installation
A torque wrench should be used for proper
installation. The recommended torque is 90 to
100 lbf-in. (10 to 11 Nm). The Belleville spring
washer stacks should be nearly collapsed flat
and the screw tip should extend ¼" (6 mm)
beyond the housing (Fig. 8).
FIGURE 8: CONSTANT-TORQUE CLAMP 05037
CAUTION
The hose clamps will break if over-torqued.
Do not over-tighten, especially during cold
weather when hose has contracted.
3.1.2 Maintenance
The constant-torque clamps contain a "Visual
torque check“ feature. When the tip of the screw
is extending ¼" (6 mm) out of the housing, the
clamp is properly installed and maintains a
leak-proof connection. Since the constant-torque
clamp automatically adjusts to keep a consistent
sealing pressure, there is no need to re-torque
hose clamps on a regular basis. During vehicle
operation and shutdown, the screw tip will adjust
according to the temperature and pressure
changes. Checking for proper torque should
be done at room temperature.
3.2 CONSTANT-TORQUE HOSE CLAMPS ON
CHARGE AIR COOLER (CAC)
If for any reason such as an accident, hose
clamps need to be changed; install and tighten
hose clamps to 10±1 lbf-ft (dry) (Fig. 9 & 10).
CAUTION
The hose clamps will break if over-tighten. Do
not over-tighten, especially during cold
weather when hose has contracted.