Freightliner Century Class. Manual - part 9

10.1

Clean and tighten the battery ground
cable, terminal, and clamps.

10.2

Inspect the retainer assembly (or battery
hold-downs) and the battery box. Replace
worn or damaged parts. Remove any cor-
rosion with a wire brush, and wash with a
weak solution of baking soda and water.
Rinse with clean water and dry. To pre-
vent rusting, paint the retainer assembly.

10.3

Check for and remove any foreign objects
such as stones, bolts, or nuts, from the
battery box.

10.4

After cleaning, connect the cables to the
batteries, and tighten them to the torque
specifications listed on the battery, gener-
ally 10 to 15 lbf·ft (14 to 20 N·m).

10.5

Coat the battery terminals with dielectric
grease.

11. Check the terminals on the battery shut-off

switch and the magnetic switch. Make sure the
terminal connections are clean and tight. Coat
the terminal connections with dielectric red
enamel after cleaning.

Alternators and Starters

15/2

MOP Number

Fan Clutch Check (Noise Emission Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–03

Pressure Relief Cap Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–01

Radiator Pressure-Flushing and Coolant Change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–02

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–00

Engine Cooling/Radiator

Index, Alphabetical

20–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

DANGER

When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.

20–01 Pressure Relief Cap

Check

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.

CAUTION

The radiator cap currently installed may not be the
same one installed when the vehicle was built. If
the radiator cap must be replaced, make sure that
it is the correct cap for the cooling system of the
vehicle. Because the radiator cap pressure rating
affects the operating temperature of the engine,
installing an improperly rated radiator cap may
have adverse effects on the cooling system, and
engine operating temperatures. This could cause
premature engine wear or damage.

Remove the fill cap first, to relieve the cooling
system pressure, then remove the SAE cap.

Using a radiator-cap tester, check the pressure
cap to see if it maintains pressure to within 10%
of the pressure rating marked on the cap. If it
doesn’t, replace the cap. See

Fig. 1

Fig. 2

Make sure that the replacement radiator cap is
correctly rated for the cooling system of the
vehicle.

There is a second valve in the radiator cap that
opens under vacuum. This prevents the collapse
of hoses and other parts that are not internally
supported when the system cools. Inspect the
vacuum-relief valve to be sure it is not stuck.

Make sure that the cap seals properly on the
coolant filler neck seat, and that the radiator cap
gasket is not damaged. On vehicles with screw
on caps with O-rings, make sure that the O-ring
is not cracked or deteriorated. Replace the cap if
the gasket shows deterioration or damage.

20–02 Radiator Pressure-

Flushing and Coolant
Change

NOTE: For additional instructions on cleaning
and flushing the engine’s cooling system, see
the applicable engine manufacturer’s mainte-
nance and operation manual.

Park the vehicle, apply the parking brakes. Tilt
the hood or cab. For instructions on tilting the
cab, see Group 60 of the Century Class Trucks
Workshop Manual.

Place a suitable container under the elbow of the
radiator outlet pipe and under the radiator. The
container should hold at least 60 quarts (58.6
liters) of fluid for single radiator applications, or
80 quarts (76 liters) for Argosy’s with auxiliary
radiators.

WARNING

Remove the surge tank cap.

On Argosy’s with auxiliary radiators, open the
remote bleed valve. See

Fig. 3

Engine Cooling/Radiator

20/1

WARNING

Do not attempt to drain the cooling system until
the coolant and engine are cool. Draining the

cooling system prior to the system cooling could
cause severe personal injury due to scalding.

Remove the drain plugs from the radiator side
tank, the lower tank on auxiliary radiators, and at
the lower radiator outlet pipe elbow, if equipped.
See

Fig. 4

. Allow the coolant to drain.

Install and tighten the drain plug(s) and the ra-
diator outlet pipe drain plug after the radiator has
been drained. Do not overtighten the plugs.

Flush the radiator(s) as follows.

7.1

Disconnect the radiator upper and lower
hoses.

7.2

Attach the flushing gun nozzle to the ra-
diator at the lower radiator hose opening.
Run the water until the radiator is full.

NOTICE

When flushing the radiator, do not apply more
than 15 psi (100 kPa) air pressure. Excessive pres-
sure can damage the radiator.

f500244

06/08/95

Low-Coolant-Level Sensor

SAE Cap (for coolant overflow pressure relief only)

Fill Cap

Fig. 1, Surge Tank, Century Class Conventional

07/21/98

f200465

Radiator/Charge Air Cooler Assembly

Fill Cap

Surge Tank

Fig. 2, Surge Tank, Argosy COE

Engine Cooling/Radiator

20/2

Content .. 7 8 9 10 ..