MTU 12 V 4000 M63 Specifiche Scaricare il pdf (Pagina 19)

Coolants 17

Marine engines are subject to the following limitations when using corrosion-inhibiting antifreezes:

• Series 956-01, 956-02, 1163-03:

These engines are ﬁtted with heating units. Because of their cooler capacity, corrosion-

inhibiting antifreezes must not be used.

• Series 099, 183, 396:

The use of corrosion-inhibiting antifreeze in these engines is permitted only at seawater

temperatures of up to 20 °C maximum.

• Series 2000 and 4000:

Corrosion-inhibiting antifreeze may be used with these engines at seawater temperatures up to 25 °C max.

• Series 8000:

The use of corrosion-inhibiting antifreezes is not allowed for these engines.

Corrosion-inhibiting antifreezes can be used without reservation in vehicle, locomotive and

stationary applications, except Series 8000 engines.

Note:

Propylene glycol-based corrosion-inhibiting antifreezes are stipulated for use in some types of

applications. These products have a lower thermal conductivity than the usual ethylene glycol

products. This brings about a higher temperature level in the engine.

The product BASF G206 is available for use at extremely low temperatures (< -40 °C).

Special approval presently in effect remain valid.

Water-soluble corrosion inhibitors

Water-soluble corrosion inhibitors are required for higher coolant temperatures and large temperature drops in heat

exchangers, e.g. in TB- (with plate core heat exc hanger) and TE-systems in Series 396, 4000 and 183 engines.

For Series 8000 engines, only water-soluble corrosion-inhibitors in accordance with Chapter 8 may be used.

Special arrangements presently in effect remain valid.

The watersoluble corrosion inhibitors recommended by MTU ensure adequate protection provided the correct

concentrations are used. The relevant concentration range for use is listed in the section on operational monitoring.

Flushing with water is required at every change to a different coolant product. This also applies to new engines. The

required procedures are described in Chapter 10 (Flushing and cleaning speciﬁcations for engine coolant circuits).

Operational monitoring

Inspection of the fresh water and continuous monitoring of the coolant are essential for trouble-free engine operation.

Fresh water and coolant should be inspected at least once per year and with each ﬁll-up. Inspections can be carried

out using the MTU test kit which contains the necessary equipment, chemicals and instructions for use.

The following tests can be conducted with the MTU Test Kit:

• Determination of total hardness (°d)

• pH value

• Chloride content of fresh water

• Corrosion-inhibiting oil content

• Antifreeze (corrosion-inhibiting) concentration

• Water-soluble corrosion inhibitor content

Orders for fresh water and coolant analysis may be placed with MTU. Samples of min. 0.25 l must be supplied.

Permissible concentrations

Min. % by vol. Max. % by vol.

Emulsiﬁable corrosion-inhibiting oils

1.0 2.0

Corrosion-inhibiting antifreezes

Antifreeze protection to approx. –25

°C

Antifreeze protection to approx. –40

°C

Propylene glycol corrosion-inhibiting

antifreeze

Antifreeze protection to approx. –25

°C

Antifreeze protection to approx. –40

°C

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