Freightliner Business Class. Manual - part 12

CAUTION

When flushing the radiator, do not apply more
than 20 psi (138 kPa) air pressure. Excessive pres-
sure can damage the radiator or heater core.

Drain the radiator, and flush the radiator until
clean water flows from the radiator. Remove the
flushing gun.

Close the petcock at the bottom of the radiator.

Connect the hoses. Your hose clamps can be
either T-bolt clamps (

Fig. 3

) or Breeze Constant-

Torque clamps (

Fig. 4

When working with T-bolt type hose clamps,
tighten the clamps 55 lbf·in (620 N·cm). These
clamps are now standard on hoses with an in-
side diameter greater than 2 inches (51 mm).

When installing the Breeze Constant-Torque
hose clamps, the clamps must be tightened to
the correct torque. The screw tip of the clamp
must extend about 1/4 inch (6 mm) from the
clamp housing, and the belleville washer stacks
must be collapsed almost flat. Use a torque
wrench to install these hose clamps correctly.

The correct installation torque for Breeze
Constant-Torque hose clamps is as follows:

For Breeze Constant-Torque hose clamps with a
5/16-inch tightening screw hex:

55 lbf·in (620

N·cm).

For Breeze Constant-Torque hose 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-

f500108a

11/19/94

Radiator

Horn

Fig. 2, Draining The Engine Coolant

02/28/96

f200326

Fig. 3, T-Bolt Type Hose Clamp

08/15/94

f200286

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

almost flat.

Tightening Screw Hex

Fig. 4, Breeze Constant-Torque Hose Clamp Installation

Engine Cooling/Radiator

Business Class Trucks Maintenance Manual, August 2003

20/2

down, the screw tip may adjust according to
temperature and pressure changes. The torque
may need to be adjusted for individual applica-
tions.

Fill the radiator with coolant.

For Mercedes-Benz OM 366LA engines, maintain
a minimum of 50 percent by volume of a
corrosion-inhibiting antifreeze. Do not use more
than 55 percent by volume of corrosion-inhibiting
antifreeze, and do not add any other substances
to the coolant.

For all other engines, use a mixture of 50 per-
cent water and 50 percent corrosion-inhibiting
antifreeze to protect the engine to –34°F (–37°C)
year round.

See

Table 1

and

Table 2

for engine cooling sys-

tem capacities.

See

Table 3

for approved antifreezes.

Coolant Capacities (all but FL112)

Engine Make and

Model

Radiator Core

and System Capacity

2 Row

quarts (liters)

3 Row

quarts (liters)

Caterpillar CFE
Series

28 (26.5)

—

Cummins B Series

30.5 (28.9)

31.0 (29.3)

Cummins C Series
and M11

31.2 (29.5)

—

Detroit Diesel
Series 50

31.4 (29.7)

—

Dodge Magnum V-8

28 (26.5)

—

Dodge Magnum V-10

36 (34)

—

Mercedes-Benz
OM 366LA

29.5 (27.9)

30.0 (28.4)

System capacity includes all hoses, fittings, and the heater core.

Table 1, Coolant Capacities (all but FL112)

Coolant Capacities (FL112 only)

Engine Make and

Model

Radiator Core

and System Capacity

1000 Sq. In.

quarts (liters)

1200 Sq. In.

quarts (liters)

Caterpillar C10
Series

30.8 (29.1)

33.7 (31.9)

Caterpillar C12
Series

30.8 (29.1)

33.7 (31.9)

Cummins M11

30.0 (28.4)

32.9 (31.1)

Detroit Diesel
Series 55

35.1 (33.2)

38.0 (36.0)

System capacity includes all hoses, fittings, and the heater core.

Table 2, Coolant Capacities (FL112 only)

Approved Coolants

Engine Type

Coolant

Manufacturer

Coolant

Designation

Diesel

Texaco

JC04 Antifreeze

Van Waters and

Rogers Ltd.

(Canada)

Diesel Antifreeze

No. 6038

Gasoline

†

Chrysler

Mopar

Freightliner-approved antifreeze must meet one of the following condi-

tions: A. Ethylene glycol solution that meets GM 6038–M Engineering Stan-
dards. B. Ethylene glycol solution that has less than 0.1% anhydrous so-
dium metasilicate, and meets either GM 1825–M or GM 1899–M
Engineering Standards.

†

Because Dodge Magnum Engines use aluminum parts, the coolant used

with these engines must contain Alugard 340-2

™

Table 3, Approved Coolants

NOTE: You can mix purple-pink coolant (pre-
charged with a borate/nitrate-based additive)
with the common green coolant, although some
color change will be apparent.

Engine Cooling/Radiator

Business Class Trucks Maintenance Manual, August 2003

20/3

20–03 Fan Clutch Checking

(Noise Emission
Control)

Eaton Viscous Fan Clutch

CAUTION

If the fan drive assembly is damaged, replace the
unit as soon as possible. Operating a seized or
otherwise damaged clutch reduces fuel economy,
and could cause serious engine damage.

See Group 20 of the

Business Class

Trucks Ser-

vice Manual

for replacement instructions.

With the engine off, rotate the fan at least one
full turn by hand. It should have a smooth,
steady drag. If it does not, replace the fan clutch.

Check for physical damage to the fan or fan
shroud.

At the fan clutch mounting:

3.1

Check for correct drive belt alignment and
tension. For specifications, see Group 01
of the

Business Class

Trucks Service

Manual

3.2

Check for wear of the fan clutch bearings.
There should be no side-to-side or in-
and-out movement of the fan clutch.

3.3

Do all of the checks in Section 20.02 of
the

Business Class

Trucks Service

Manual

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

Business

Class

Trucks Service 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. 5.

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

f200290

08/08/94

System Sentry

Fuse

Safeguard Hole

Friction Facing

Piston Friction Disc

Air Chamber

Fig. 5, Horton Advantage Fan Clutch

Engine Cooling/Radiator

Business Class Trucks Maintenance Manual, August 2003

20/4

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

Business Class

Trucks Service

Manual

for troubleshooting and repair proce-

dures.

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

Business Class

Trucks Service 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. 6

, 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:

10.1

Connect the halves of the fan solenoid
connector.

10.2

Turn the air conditioner off.

10.3

Start the engine and charge the air sys-
tem to 120 psi (827 kPa). Tests must be
performed with the engine temperature
below 205°F (96°C) for Caterpillar en-

gines, and below 200°F (93°C) for Cum-
mins and Detroit Diesel engines.

10.4

Set the toggle switch to the ON position;
the fan clutch should engage.

10.5

Apply the foot brake, and release the
parking brakes.

10.6

Set the toggle switch to the AUTO or OFF
position; the air should exhaust and the
fan clutch should disengage. Replace the
switch if necessary.

11. If the fan stays engaged at all times on a Detroit

Diesel engine, check the circuit breaker labeled
"engine fan."

Kysor K22RA Fan Clutch

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.

Measure the distance from the back surface of
the fan clutch retaining plate to the forward-most
edge of the fan belt pulley. See

Fig. 7

, Ref. A.

Disconnect the line from the air inlet of the air
cylinder. Connect a shop air hose to the inlet.

Apply a minimum of 100 psi (690 kPa) air pres-
sure to the air cylinder—the bearing housing will
move backwards, disengaging the clutch. Again,
measure the distance from the back surface of
the retaining plate to the forward-most edge of
the fan belt pulley.

Compare the two measurements; if the difference
between the two measurements exceeds 0.150
inches (3.8 mm), the clutch lining is worn and
must be replaced. See Group 20 of the

Busi-

ness Class

Trucks Service Manual

for clutch

lining replacement instructions.

Release the air pressure, then disconnect the
shop hose from the air inlet of the air cylinder.
Connect the vehicle air hose to the inlet.

Connect the electrical cables to the battery.

Engine Cooling/Radiator

Business Class Trucks Maintenance Manual, August 2003

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