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.
7. Fill the radiator with coolant.
Use a mixture of 50 percent water and 50 per-
cent corrosion-inhibiting antifreeze to protect the
engine to –34°F (–37°C) year round.
See Table 1 for engine cooling system capacity
and Table 2 for approved antifreezes.
Engine Make and Model
Radiator Core and
System Capacity
*
:
quarts (liters)
Caterpillar CFE Series 28 (26.5)
Cummins B Series and ISB 30.5 (28.9)
Cummins C Series 31.2 (29.5)
Mercedes-Benz 904 Series 29 (27.5)
Mercedes-Benz 906 Series 37.2 (35.2)
*
System capacity includes all hoses, fittings, and the heater core.
Table 1, Coolant Capacities
Coolant Manufacturer Coolant Designation
*
Texaco JC04 Antifreeze
Van Waters and Rogers
Ltd. (Canada)
Diesel Antifreeze No. 6038
*
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.
Table 2, Approved Coolants
20–03 Eaton Viscous Fan Drive
Checking (Noise
Emission Control)
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 Section 20.02 of the
School Bus Chassis Work-
shop Manual
for replacement instructions.
1. With the engine shut down, 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.
2. Check for physical damage to the fan or fan
shroud.
3. At the fan clutch mounting:
3.1 Check for correct drive belt alignment and
tension. For specifications, see Group 01
of the
School Bus Chassis Workshop
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 20.00 of
the
School Bus Chassis Workshop
Manual
.
Engine Cooling/Radiator20
School Bus Chassis Maintenance Manual, March 200320/2
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