Operation and maintenance manual

Cooling System QSB4.5 and QSB6.7
Page 7-4 Section 7 - Maintenance Procedures at 2000 Hours or 2 Years
Check for damaged hoses and loose or damaged hose
clamps. Replace as required. Check the radiator for leaks,
damage, and buildup of dirt. Clean and replace as
required.
Flush
CAUTION
The system must be filled properly to prevent air
locks. During filling, air must be vented from the
engine coolant passages. Wait 2 to 3 minutes to allow
air to be vented; then add mixture to bring the level to
the top.
To be sure air is vented during the fill process:
•
The thermostat has check balls that allow air to vent
through the thermostat when the thermostat is
closed.
•
A deaeration port is located next to the water outlet
connection which connects to the top tank/coolant
recovery tank of the cooling system.
This provides adequate venting for a fill rate of 19 liters [5
gal.] per minute.
NOTE: An alternate to using sodium carbonate, as
outlined in this procedure, is to use RESTORE™.
RESTORE™ is a heavy-duty cooling system cleaner that
removes corrosion products, silica gel, and other deposits.
The performance of RESTORE™ is dependent on time,
temperature, and concentration levels. An extremely
scaled or flow-restricted system, for example, can require
higher concentrations of cleaners, higher temperatures, or
longer cleaning times or the use of RESTORE Plus™. Up
to twice the recommended concentration levels of
RESTORE™ can be used safely. RESTORE Plus™ must
be used only at its recommended concentration level.
Extremely scaled or fouled systems can require more than
one cleaning.