Sterling Trucks 360 2006, Manual

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11-36 11-36
Pretrip inspection and Pretrip inspection and maintenance maintenance
5 5 A A dd dd in in g g co co ol ol an an t t
CAUTION CAUTION
Under normal conditions, add coolant to the Under normal conditions, add coolant to the
surge tank without opening the pressure cap surge tank without opening the pressure cap
on the radiator. on the radiator.
When adding coolant, use new coolant of When adding coolant, use new coolant of the the
same kind. Do not mix different types of same kind. Do not mix different types of
coolant. coolant.
Adding plain water to the surge tank reduces Adding plain water to the surge tank reduces
the coolant mixing ratio. This means less the coolant mixing ratio. This means less
protection against freezing and corrosion. protection against freezing and corrosion.
Always maintain the original mixing ratio. Always maintain the original mixing ratio.
5.1 5.1 Add Add ing c ing c ool ool ant a ant a t the p t the p ret ret rip i rip i nsp nsp ect ect ion ion
1. 1. If the If the coola coola nt lev nt lev el is b el is b elow t elow t he “LO he “LO W” ma W” ma rk, rk,
remove the cap from the surge tank. remove the cap from the surge tank.
2. 2. Add a mi Add a mi xtur xtur e of fully e of fully -form -form ulated a ulated a ntifr ntifr eeze an eeze an d d
soft water until the level reaches the “FULL” soft water until the level reaches the “FULL”
mark. mark.
3. 3. Inst Inst all the s all the s urge t urge t ank c ank c ap and m ap and m ake s ake s ure it i ure it i s s
tight. tight.
5.2 5.2 Ad Ad din din g coo g coo lan lan t af t af ter t ter t he en he en gin gin e ove e ove rhe rhe at at s s
If the engine overheats, the coolant level may be If the engine overheats, the coolant level may be
low not only in the surge tank but also in low not only in the surge tank but also in the radiator the radiator
core. core.
1. 1. Allow Allow the eng the eng ine to c ine to c ool dow ool dow n. Run n. Run it at a sp it at a sp eed eed
slightly higher than normal idle. slightly higher than normal idle. P. 5-5 P. 5-5
2. 2. When When the n the n eedle eedle in the in the cool cool ant te ant te mper mper ature ature
gauge has come down to the center of the gauge has come down to the center of the
scale, shut down the engine and do the follow- scale, shut down the engine and do the follow-
ing steps: ing steps:
Check the cooling system for Check the cooling system for leaks. leaks.
Inspect the drive belt. Replace it if damaged. Inspect the drive belt. Replace it if damaged.
P. 11-39 P. 11-39
Check the belt tension. Correct the belt ten- Check the belt tension. Correct the belt ten-
s s i i o o n n i i f f n n e e c c e e s s s s a a r r y y P. 11-39 P. 11-39
3. 3. T T il il t th t th e c e c ab ab . . P. 11-4 P. 11-4
4. 4. Relea Relea se se the the sprin sprin g g faste faste ner ner and and turn turn the the
pressure pressure cap cap counterclockw counterclockw ise ise to to remove remove it. it. If If
the coolant level is too low, add coolant until it the coolant level is too low, add coolant until it
reaches the brim. reaches the brim.
5. 5. Tur Tur n the pres n the pres sure c sure c ap cloc ap cloc kwis kwis e to inst e to inst all it. all it.
Install the spring Install the spring fastener fastener . .
6. 6. Rem Rem ove t ove t he su he su rge t rge t ank c ank c ap and ap and add c add c oolant oolant
until the level reaches the “FULL” mark. Install until the level reaches the “FULL” mark. Install
the cap and make sure it is the cap and make sure it is tight tight
WARNING WARNING
After operating the vehicle under load, do not After operating the vehicle under load, do not
remove or loosen the radiator pressure cap remove or loosen the radiator pressure cap
until the engine and cooling system have until the engine and cooling system have
completely cooled. Use extreme care when completely cooled. Use extreme care when
removing the cap. A sudden release of pres- removing the cap. A sudden release of pres-
sure can result in a surge of scalding coolant sure can result in a surge of scalding coolant
that could cause serious that could cause serious personal injury. personal injury.
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