5.4 Emulsifiable corrosion-inhibiting oils

Emulsifiable corrosion-inhibiting oils

Emulsions of MTU-approved corrosion-inhibiting oils (1.0 – 2.0% by volume) and suitable freshwater (→ Page 26) provide adequate corrosion protection. However, they do not provide antifreeze protection. A 2% by volume concentration must be used for initial filling. The required quantity of corrosion-inhibiting oil is best mixed in advance in a container with 4 to 5 times the amount of freshwater and then added to the coolant when the engine is running at operating temperature. In maintenance stations or multi-engine installations the complete amount of coolant required should be prepared in a separate container, it can then be used for initial filling or replenishment as required. Under unfavorable conditions, individual cases of bacterial attack may occur in the emulsifiable corrosion-inhibiting oils. Treat the coolant emulsion with biocide in this case! Refer to chapter "Flushing and cleaning specifications for engine cooling circuits" (→ Page 172).

Note: Slight precipitation may occur where coolant emulsions are used. This is shown by a layer on the surface of the coolant in the expansion tank. This is of no significance provided that the emulsion concentration remains within the specified limit values. Change the coolant in the event of a sudden drop in coolant additive concentration or if the additive is no longer absorbed. If necessary, the engine coolant chambers are to be cleaned, see the chapter "Flushing and cleaning specifications for engine coolant circuits" (→ Page 172).

Emulsifiable corrosion-inhibiting oils must not be used in engines of the following series:

• Series 099 • Series 183 • Series 2000 • Series 396 • Series 4000 • Series S60 • Two-cycle engines The series with application approval for emulsifiable corrosion inhibitor oils are listed in the chapter "Approved coolants" (→ Page 132).

For the following listed serial numbers of the Series 20V956TB33 up to year of manufacture end of 2008 (as per identification plate), only emulsifiable corrosion-inhibiting oil must be used: Serial number Serial number Serial number Serial number Serial number 5870001 5870002 5870003 5870004 5870005

5870006 5870011 5870007 5870012 5870008 5870013 5870009 5870014 5870010 5870015

5870016 5870017 5870018 5870019

Table 15:

Special approvals presently in effect remain valid. The emulsifiable corrosion-inhibiting oil must never be used for coolant temperatures >90 °C!

Flushing with water is required after 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. The necessary work is described in the chapter "Flushing and cleaning specifications for engine coolant circuits" (→ Page 172).