4.
Remove the drain plugs at the radiator side tank
and at the lower radiator outlet pipe elbow, if
equipped. See
Fig. 2
. Allow the coolant to drain.
5.
Disconnect the radiator upper and lower hoses,
and install the surge tank cap and the radiator
side-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 side-tank drain plug and
allow the radiator to drain. Install and tighten the
side-tank drain plug and the radiator outlet pipe
drain plug after the radiator has been drained.
Do not overtighten the plugs.
10. Connect the hoses. Your hose clamps can be
either T-bolt clamps (see
Fig. 3
) or Breeze
Constant-Torque clamps (see
Fig. 4
).
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 inside diam-
eter 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.
11. Place a pan under the coolant filter to catch en-
gine coolant.
f011008
1
06/29/95
1
NOTE: Cummins engine shown.
1.
Coolant Drain Plug
Fig. 2, Coolant Drain Plug Location
02/28/96
f200326
Fig. 3, T-Bolt Type Hose Clamp
Engine Cooling/Radiator
20
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