•
Soluble Oils:
Soluble oil additives are not approved for use in Detroit™ engine
cooling systems. A small amount of oil adversely affects heat transfer. For
example, a 1.25% concentration of soluble oil increases the fire deck temperature
6%. A 2.50% concentration increases the fire deck temperature 15%. The use of
soluble oil additives may result in engine overheating and/or failure.
•
Chromates:
Chromate additives are not approved for use in Detroit™ engine
cooling systems. Chromate additives can form chromium hydroxide, commonly
called “green slime.” This, in turn, can result in engine damage due to poor heat
transfer. Cooling systems operated with a chromate-inhibited coolant must be
chemically cleaned with Detroit™ Genuine Coolant
Twin Pack
cooling system
cleaner/conditioner (or equivalent sulfamic acid/sodium carbonate cleaner) and
flushed.
•
Phosphate Inhibitors:
Phosphate has tendency to form deposits on surfaces
transferring high heat which ultimately affect cooling capabilities. Phosphate
deposits on water pump seals will result in coolant leakage across seal faces.
Maintenance
Maintenance
This section describes procedures needed to maintain the proper coolant level and
concentration.
Topping Off Coolant
The coolant level should be checked daily and at each service interval. If topping
off is necessary, add coolant which is identical to the initial–fill coolant. ELCs
should be topped-off with a coolant of the same formulation; SLCs should also be
topped-off with a coolant of the same formulation.
Coolant Maintenance Intervals
The following tables contain the coolant maintenance intervals.
Cooling System
This section includes information on the following:
• Changing coolant at the end of the coolant drain interval.
• Changing coolant types.
• Cooling system contamination.
How to Procedures
100
All information subject to change without notice.
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DDC-SVC-MAN-0192
