Freightliner Century Class. Manual - part 10

7.3

Gradually, apply air pressure to help dis-
lodge sediment built up in the radiator
core. Do not apply more than 15 psi (103
kPa) air pressure to the radiator. Pres-
sures exceeding 15 psi (103 kPa) could
damage the radiator core.

7.4

Shut off the air at the pressure gun
nozzle and allow the radiator to refill with
water.

7.5

Repeat the previous two steps until clean
water flows from the radiator.

7.6

Remove the radiator side tank drain plug
and allow the radiator to drain.

Connect the hoses. The hose clamps on the
main radiator can be either T-bolt clamps (see

Fig. 5

) or Breeze Constant-Torque clamps (see

Fig. 6

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

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f200726

NOTE: The main radiator drain plug is not shown.

Surge Tank

Remote Bleed Valve

Main Radiator

Auxiliary Radiator

Auxiliary Radiator Temperature Sensor

Fan Power Harness

Auxiliary Radiator Drain Plug

Cold Coolant Hose

Hot Coolant Hose

Fig. 3, Coolant System, Argosy, with Auxiliary Radiator

Engine Cooling/Radiator

20/3

install these hose clamps correctly. The correct
installation 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.

Place a pan under the coolant filter to catch en-
gine coolant.

10. Remove the coolant filter with a strap or chain

wrench. Install a new coolant filter and tighten.

IMPORTANT: On vehicles with EPA07 compliant
engines, the coolant capacity varies depending
on the engine and accessory installation. After
servicing the cooling system, always verify that
the coolant level is between the MIN and MAX
lines on the surge tank.

11. Fill the cooling system with new coolant. Refer to

the engine manufacturer’s service literature for
specific coolant information.

12. On single radiator applications, add coolant as

follows.

12.1

Fill the cooling system at the surge tank.

12.2

Install the surge tank cap.

12.3

Return the hood or cab to the operating
position. See Group 60 of the Century
Class Trucks Workshop Manual for cab
tilt instructions.

12.4

Start the engine and turn on the cab
heater. Allow the engine to warm up to

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NOTE: Cummins M11 engine shown.

Coolant Drain Plug

Fig. 4, Coolant Drain Plug Location

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Fig. 5, T-Bolt Type Hose Clamp

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f200286

A. The screw tip must extend about 1/4 inch (6 mm).
B. Belleville washer stacks must be collapsed almost

flat.

Tightening Screw Hex

Fig. 6, Breeze Constant-Torque Hose Clamp Installation

Engine Cooling/Radiator

20/4

normal operating temperature. Check the
radiator and hoses for leaks. Repair if
necessary.

12.5

Shut off the engine, then check the cool-
ant level in the surge tank. Add coolant if
the level is not between the MIN and
MAX lines on the surge tank.

13. On Argosy’s with auxiliary radiators, bleed the

system while adding coolant as follows.

13.1

Open the remote bleed valve on the left
side of the frontwall.

13.2

Fill the cooling system at the surge tank;
continue adding coolant until a non-
aerated coolant stream comes out of the
remote bleed valve. This allows air to be
expelled from the auxiliary system.

13.3

Close the remote bleed valve.

13.4

Continue filling until the coolant reaches
the high level mark on the surge tank.

13.5

Run the engine for 5 minutes to allow the
system to de-aerate.

13.6

Check the coolant level again; add cool-
ant to the high level mark.

20–03 Fan Clutch Check (Noise

Emission Control)

Horton Advantage® Fan Clutch

NOTE: If any part of the fan clutch needs to be
repaired or replaced, after performing the
checks below, see Group 20 of the Century
Class Trucks Workshop Manual.

Disconnect the electrical cables from the battery.
Drain all air from the air system. If equipped with
an air starter, drain the air starter reservoir.

WARNING

If the engine starts during this procedure, the fan
could cause personal injury. If the vehicle is
equipped with an air starter, be sure that the air
starter reservoir is drained.

Inspect the electrical connections and wires to
the fan clutch solenoid. Secure the connection if
loose; replace wires and connectors if damaged.

Clean the fan clutch air solenoid valve filter, if
equipped.

3.1

Unscrew the fan clutch solenoid valve air
filter assembly and remove the filter ele-
ment.

3.2

Clean the filter element with cleaning sol-
vent.

3.3

Reassemble the clutch valve solenoid air
filter assembly and install on the vehicle.

Visually check the fan for bent, cracked, or dam-
aged blades. Replace if damaged. Check for ad-
equate clearance between the fan and other
components.

Check the fan belt for wear, tension, and align-
ment. Correct if necessary.

Check for wear on the friction facing. See

Fig. 7

Replace the friction facing if it is worn to a 1/16-
inch (1.6-mm) thickness or less. Also check the
facing for signs of oil contamination or burn
marks. If evidence of oil or burn marks are
found, replace the friction facing.

Connect the battery cables. Start the engine, and
charge the air system to 120 psi (827 kPa). Shut
down the engine. Separate the halves of the fan
solenoid connector. The fan clutch should en-
gage.

If the fan does not operate correctly, see Group
20 of the Century Class Trucks Workshop
Manual for troubleshooting and repair proce-
dures.

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System Sentry® Fuse

Safeguard Hole

Friction Facing

Piston Friction Disc

Air Chamber

Fig. 7, Horton Advantage Fan Clutch

Engine Cooling/Radiator

20/5

With the air system charged to 120 psi (827
kPa), and with the fan solenoid connector halves
separated, check the fan clutch for audible air
leaks, using a suitable listening device.

If a leak is detected, remove the fan blade. Using
a soapy water solution, check the fan clutch at
the following locations to locate the source of the
leak. Install a new seal kit. See Group 20 of the
Century Class Trucks Workshop Manual for re-
pair procedures.

9.1

Check for a leak at the bleed hole on the
fan pilot. Air leakage means that the car-
tridge assembly (

Fig. 8

, Ref. 16) or face

seal (Ref. 17) is damaged.

9.2

Check for air leaks between the air cham-
ber and the piston friction disc. Air leak-

age means that the large O-ring (Ref. 14)
is damaged.

9.3

Check for air leaks around the safeguard
hole on the piston friction disc. Air leak-
age means the small O-ring (Ref. 18) is
damaged.

9.4

Check for air leaking from the System
Sentry® fuse. Leaking air means the
clutch has gotten so hot the lead alloy in
the fuse melted. This released the clutch
before the heat could damage the clutch
bearings. Before replacing the fuse, find
and repair the source of the heat.

10. If equipped with an override toggle switch on the

dash, check the fan clutch operation as follows:

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03/30/95

Mounting Bracket

Rear Sheave Bearing

Inner and Outer Bearing
Spacers

Forward Sheave Bearing

Sheave

Friction Facing

Journal Spacer

Socket-Head Capscrew

Rear Hub Bearing

10. Bearing Spacer
11. Splined Hub
12. Forward Hub Bearing
13. Piston Friction Disc
14. Large O-Ring
15. Locknut
16. Cartridge Assembly

17. Face Seal
18. Small O-Ring
19. Air Chamber
20. Socket-Head Capscrew
21. Stud Bolt
22. Lockwasher
23. Hexnut
24. Piston Assembly

Fig. 8, Horton Advantage Fan Clutch Components

Engine Cooling/Radiator

20/6

Content .. 8 9 10 11 ..