5.6 Coolant without antifreeze The predecessor version of the MTU Fluids and Lubricants Specifications used the term "water-soluble corrosion inhibitors". For clarity purposes, this publication uses the term "Coolant without antifreeze". Emulsifiable corrosion inhibitor oils are not covered in this chapter. See the chapter "Emulsifiable corrosion inhibitor oils" (→ Page 27) Coolant without antifreeze is required for higher coolant temperatures and large temperature drops in heat exchangers, e.g. in TB systems (with plate-core heat exchanger) and TE systems in Series 099, 183, 2000, 396 and 4000 engines. Provided that they are used in adequate concentration, coolants without antifreeze approved by MTU provide effective corrosion protection. The relevant concentration range for use is listed in the section on operational monitoring. For approved coolant additives for the individual engine series, refer to chapter "Approved coolants" (→ Page 132). Special arrangements presently in effect remain valid. Coolant additives containing nitrite must not be used in conjunction with coolers that contain brass!
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Flushing with water is required at every change to a different coolant product. For preserved engines (new engines, field engines, reserve stock engines, etc.), a flushing run must be carried out prior to filling with engine coolant if the engines were preserved with an emulsifiable corrosion inhibitor. The necessary work is described in the chapter "Flushing and cleaning specifications for engine coolant circuits" (→ Page 172).
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