SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE Glycol-based Coolants Formulated For HVAC These coolants formulated for Heating/Ventilation/Air Conditioning (HVAC) should not be used. These coolants generally contain high levels of phosphates, which can deposit on hot internal engine surfaces and reduce heat transfer. soluble oil additives may result in engine overheating and/or failure. Chromate Additives These additives are not approved for use in Detroit Diesel 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 chromium-inhibited coolant must be chemically cleaned with Power Cool dry chemical cooling system cleaner/conditioner listed in Table 37 (or equivalent sulfamic acid/sodium carbonate cleaner) and flushed. Additives Not Recommended The following additives are not recommended for use in Series 60 engines. Soluble Oil Additives These additives are not approved for use in Detroit Diesel engine cooling systems. A small amount of oil adversely affects heat transfer. For example, a 1.25% concentration of soluble oil increases fire deck temperature 6%. A 2.50% concentration increases fire deck temperature 15%.
The use of Coolant Inhibitor Test Intervals The coolant inhibitor level should be checked at the intervals listed in Table 20. Table 20 Required Coolant Inhibitor Test Intervals All information subject to change without notice. 97 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Service Application Inhibitor Test Interval On-Highway Trucks and Motor Coaches 20,000 Miles (32,000 Kilometers) City Transit Coaches, Pick-Up and Delivery, Short Trip, and Emergency Vehicles 6,000 Miles (9,600 Kilometers) or 3 Months, whichever comes first