Operation and maintenance manual

QSB4.5 and QSB6.7 Cooling System
Section 7 - Maintenance Procedures at 2000 Hours or 2 Years Page 7-3
CAUTION
Do not add cold coolant to a hot engine. Engine
castings can be damaged. Allow the engine to cool
below 50°C [120°F] before adding coolant.
On applications that use a coolant recovery system, check
to make sure the coolant is at the appropriate level on the
coolant recovery tank, for the engine temperature.
Many coolant recovery/expansion tanks, also called “top
tanks”, have sight glasses (1) or are made of a clear
material (not shown) to aid in checking the coolant level
(2) without removing the radiator cap.
Fill the cooling system with coolant to the bottom of the fill
neck in the radiator fill or recovery/expansion tank.
NOTE: Some radiators have two fill necks, both of which
must be filled when the cooling system is drained.
Drain
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.
Remove the radiator/expansion tank cap.
WARNING
Coolant is toxic. Keep away from children and pets. If
not reused, dispose of in accordance with local
environmental regulations.
Drain the cooling system by opening the drain valve on
the radiator and removing the plug in the bottom of the
water inlet. A drain pan with a capacity of 19 liters [5 gal.]
will be adequate in most applications.