LI3978E

LI3978E
INFORMATION LETTER
REFERENCE:
Nova Bus Manuals
SECTION:
09: Engine and Cooling
RS NO:
N/A
APPLICATION DEADLINE: N/A
EFFECTIVE IN PROD.: N/A
SUBJECT:
Engine coolant
JUSTIFICATION:
Information about the engine coolant.
LEVEL
DESCRIPTION
1
2
DIRECT CHARGES
TIME
LABOUR
MATERIAL
–
–
–
–
–
–
–
–
MATERIAL
QTY
PART NO
REV.
DESCRIPTION
REPLACES PART N°
–
–
–
–
–
–
–
–
LEVEL 1
–
LEVEL 2
–
DISPOSAL OF PARTS
REMOVED PARTS ARE:
DISCARDED
RETAINED
–
–
* Dispose of the unused parts and the defective parts in
accordance with local environmental standards in effect.
REVISION HISTORY
REV.
DATE
NR
2021FE04
APPROVED BY:
NQF772002 VERSION 3
CHANGE DESCRIPTION
Initial release
Jean-Nicolas Fournier
WRITTEN BY
André Pelletier
Digitally signed by Jean-Nicolas Fournier
DN: cn=Jean-Nicolas Fournier, o=Nova Bus, [email protected], c=CA
Date: 2021.02.09 08:31:26 -05'00'
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INFORMATION LETTER
LI3978E
NOTE
See the engine's corresponding owner's/operation and maintenance manual for specific engine coolant
maintenance, requirements and specifications.
Compliance with Cummins recommendations for permissible coolants and additives is mandatory. Only
coolants homologated by Cummins can be used (CES 14603).
See Fluids for Cummins® Products Service Manual, Bulletin 5411406. Reference Section 5. Available on
their website:
https://qsol.cummins.com/qs3/portal/service/manual/en/5411406/
COOLANT MIXING
Coolant types should not be mixed in the engine. However it is recognized that:
•
There are emergency situations where there may be no other option than to mix two different coolant
formulations.
•
There may be some business justification for very controlled situations involving mixing of coolants
as part of a coolant changeover plan wherein the customer is making a concerted effort to move from
using one coolant formulation to another coolant formulation and they want to avoid the cost of a 100%
coolant drain and replacement which can be very costly for a large fleet.
Topping-up with different types of coolants should be done in emergency situations only.
The official mixing limit is 20% regardless of coolant type.
Color is not a reliable method for identifying coolant. Coolant mixing, contamination, and degradation can
influence coolant colors. Additionally, some brands may use different formulations and colors.
Topping off the cooling system using the same coolant formulation used to fill the cooling system is critical
for maintaining additive concentrations and freeze protection. Never top off cooling system with water only.
This can lead to deposit formation and inadequate corrosion and cylinder liner protection.
Organic acid technology (OAT)/Extended Life coolants use high levels of salts of organic acids for cylinder
liner pitting protection and do not use nitrite and or molybdate. Therefore, these coolants do not have SCA
numbers. Additionally, OAT additives deplete much slower than conventional additives and as a result OAT
coolants do not require addition of SCA products. Meaning that OAT must use chemical-free coolant filters.

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NQF772002 VERSION 3