10. Run the engine at moderate speed until the thermostat starts to open. The
thermostat starts to open at 83°C (181°F) and is fully open at 95°C (203°F).
Then run it for about five minutes longer. Shut down the engine and allow it
to cool to approximately 50°C (112°F).
11. Drain the hot water.
12. Fill the cooling system with new coolant. For detailed procedures, see the
vehicle/chassis maintenance manual. For types of coolant, refer to section
"How to Select Coolant" for the listing of required intervals using the
recommended coolants.
Coolant Selections and Maintenance
This section covers selection of the required coolant for the engine.
Extended Life Coolants
Extended Life Coolant (ELC) contain Organic Acid Technology (OAT) which
provide corrosion protection and inhibit liner cavitation. These coolants require less
maintenance over the useful life of the engine.
ELC antifreeze coolants are commercially available from Detroit™ (recommended)
and other manufacturers as either concentrated or pre-mixed formulations.
Concentrated antifreeze coolants should be mixed at 50% (50% antifreeze/50%
water). All ELC's used must also meet Detroit 93K217 specification. Detroit™
requires that these types of coolants to be free of nitrite and phosphate. Detroit™
has found that ELC's containing nitrite may lead to a breakdown of the coolant and
subsequent damage to the cooling system.
These types of coolants should not be mixed with Standard Life Coolants.
If an
ELC antifreeze coolant and SLC antifreeze coolants are mixed, damage may not
result, but the long-life advantages of the ELC antifreeze coolant will be lost. In
this event, the coolant should be re-inhibited with OAT inhibitors and confirmed by
analysis or else it must be maintained as an SLC antifreeze coolant.
SLC Antifreeze Coolants
Standard Life Coolant (SLC) contain inhibitor salts, including nitrites, to prevent
liner cavitation. These coolants require interval testing to maintain inhibitor
concentration.
SLC antifreeze coolants are commercially available from Detroit™ (recommended)
and other manufacturers as either concentrated or as pre-mixed antifreeze.
Concentrated antifreeze coolants should be mixed at 50% (50% antifreeze/50%
water). All fully formulated coolants used must also meet Detroit 93K217
specification.
NOTE:
Fully formulated antifreeze does not require a dosage of
Supplemental Coolant Additive (SCA) at initial use.
GHG17 DD Medium Duty Operators Manual
All information subject to change without notice.
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DDC-SVC-MAN-0192
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