freightliner PE116DC, Maintenance Manual

Page: 42 / 164

WARNING
Do not remove or loosen the surge tank cap until
the engine and cooling system have completely
cooled. Use extreme care when removing the cap.
A sudden release of pressure from removing the
cap prior to the system cooling can result in a
surge of scalding coolant that could cause seri-
ous personal injury.
3. Remove the surge tank cap.
4. Remove the drain plugs from the radiator tank.
Allow the coolant to drain.
5. Disconnect the radiator upper and lower hoses,
and install the surge tank cap and the radiator
tank drain plug. Attach the flushing gun nozzle to
the radiator at the lower radiator hose opening.
Run the water until the radiator is full.
CAUTION
When flushing the radiator, do not apply more
than 15 psi (100 kPa) air pressure. Excessive pres-
sure can damage the radiator.
6. Gradually, apply up to 15 psi (100 kPa) air pres-
sure to help dislodge sediment that has built up
in the radiator core.
7. Shut off the air at the pressure gun nozzle and
allow the radiator to refill with water.
8. Repeat the previous two steps until clean water
flows from the radiator.
9. Remove the radiator drain plug and allow the
radiator to drain. Install and tighten the drain plug
after the radiator has been drained. Do not over-
tighten.
10. Connect the hoses. Your hose clamps can be
either T-bolt clamps (see Fig. 2 ) or Breeze
Constant-Torque clamps (see Fig. 3 ).
When working with T-bolt hose clamps, tighten
the clamps 55 lbf·in (620 N·cm). These clamps
are now standard on hoses with an in diameter
greater than 2 inches (51 mm).
When installing Breeze Constant-Torque hose
clamps, the clamps must be tightened to the cor-
rect torque. The screw tip of the clamp must ex-
tend about 1/4 inch (6 mm) from the clamp hous-
ing, and the Belleville washer stacks must be
collapsed almost flat. Use a torque wrench to
install these clamps correctly. The correct instal-
lation torque is as follows:
For Breeze Constant-Torque clamps with a 5/16-
inch tightening screw hex:
55 lbf·in (620 N·cm).
For Breeze Constant-Torque clamps with a 3/8-
inch tightening screw hex:
90 lbf·in (1020 N·cm).
NOTE: All hose clamps will lose torque after
installation due to "compression set." However,
when correctly installed, Breeze Constant-
Torque clamps will hold enough torque to auto-
matically adjust and keep consistent sealing
pressure. During vehicle operation and shut-
down, the screw tip may adjust according to
temperature and pressure changes. The torque
may need to be adjusted for individual applica-
tions.
f200326 10/05/2016
Fig. 2, T-Bolt Type Hose Clamp
f200286 10/05/2016
A
B
1
A. The screw tip must extend about 1/4 inch (6 mm).
B. Belleville washers must collapse almost flat.
1.
Tightening Screw Hex
Fig. 3, Breeze Constant-Torque Hose Clamp Installation
Engine Cooling/Radiator
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New Cascadia Maintenance Manual, November 2019
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