HOW-TO SECTION 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. oil additives may result in engine overheating and/or failure. Chromate — Chromate 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/conditionerrefer to section POWER COOL Cooling System Cleaners (or equivalent sulfamic acid/sodium carbonate cleaner) and flushed. Additives Not Recommended The following additives are not recommended for use in MBE 900 engines. Soluble Oils — Soluble oil 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 soluble Coolant Inhibitor Test Intervals The coolant inhibitor level should be checked at the intervals listed in Table 16. Table 16 Required Coolant Inhibitor Test Intervals 108 All information subject to change without notice. (Rev. 04/08) DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION Service Application Inhibitor Test Interval Long Haul — Highway Trucks and Motor Coaches — operates more than 60,000 miles (100,00 km) per year 20,000 Miles (32,000 Km) Short Haul — City Transit — operates up to 60,000 miles (100,000 km) per year.
15,000 miles (25,000 Km) Severe Service — Fire Truck or Crash/Rescue Vehicle — operates up to 6,000 miles (9,600 km) or under severe conditions. 6,000 Miles (9,600 Km) 300 hours or 1 year, whichever comes first