Service Manual

Cooling System ISB, ISBe and QSB (Common Rail [...]
Page 8-40 Section 8 - Cooling System - Group 08
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WARNING
Do not remove the pressure cap from a hot engine.
Wait until the coolant temperature is below 50°C
[122°F] before removing the pressure cap. Heated
coolant spray or steam can cause personal injury.
WARNING
Do not stand near the surge tank or radiator while
operating the engine with the pressure cap off. If the
vehicle is equipped with a fill door on side of the
surge tank, keep it closed due to coolant expansion.
CAUTION
Do not operate the engine with the pressure cap off at
temperatures above 93°C [200°F]. This can result in
potential engine damage by cavitation of the water
pump and localized boiling.
CAUTION
Topping off the system while hot is not recommended
when using the fill door on transit bus applications
equipped with surge tanks. Bringing the level to the
bottom of the door while the system is hot will not
provide adequate volume of coolant for lower
operating temperatures. This can result in cavitation
of the water pump and greatly increase the potential
for engine damage.
CAUTION
Before topping off coolant, allow the system
temperature to cool to ambient. This will ensure that
an adequate amount of coolant is available to the
water pump during all periods of operation.
CAUTION
Do not relieve the system pressure while hot in order
to “top off” immediately before returning the vehicle
to service. The system will not be able to generate the
pressure through the expansion of the coolant
necessary for operation. This can result in potential
engine damage by cavitation of the water pump and
localized boiling.
Remove the radiator or fill cap.
Fill the cooling system to the capacity or level stated in the
OEM service manual, using a mixture of 50 percent water
and 50 percent ethylene glycol or propylene glycol
antifreeze.