Installation; Maintenance; Constant-Torque Hose Clamps On Charge Air Cooler (Cac) - PREVOST H3-41 Maintenance Manual

FIGURE 2: COOLANT FLOW TO RADIATOR (VOLVO
D13)

4.1.1 Installation

A torque wrench should be used for proper
installation. The Belleville spring washer stacks
should be nearly collapsed flat and the screw tip
should extend ¼" (6 mm) beyond the housing
(FIGURE 3).
TORQUE: 90-100 lb-in (10-11 Nm)
CAUTION
The hose clamps will break if over-torqued.
Do not over-tighten, especially during cold
weather when hose has contracted.
FIGURE 3: CONSTANT-TORQUE CLAMP

4.1.2 Maintenance

The constant-torque clamps contain a "Visual
torque check" feature. When the tip of the screw
05037
PA1615 Maintenance Manual All Series
SECTION 05b: X3 SERIES COOLING SYSTEM
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.
4.2 CONSTANT-TORQUE HOSE CLAMPS ON
CHARGE AIR COOLER (CAC)
If for any reason hose clamps need to be
replaced; install and tighten hose clamps to
specified torque (dry) (Figure 4).
TORQUE: 4.5-5.5 lb-ft (6.1-7.46 Nm)
CAUTION
The hose clamps will break if over-tighten. Do
not over-tighten,
weather when hose has contracted.
FIGURE 4: CHARGE AIR COOLER HOSE CLAMPS
4.2.1 Maintenance
Since the constant-torque clamp automatically
adjusts to keep a consistent sealing pressure,
there is no need to 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.
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Section 05b revised September 2016
especially during cold
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