Specifications

Coolants 15

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

Corrosion-Inhibiting Antifreezes for Special Applications

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. Specifications for concentrations are in accordance with (→ Table Calc.

table for corrosion-inhibiting antifreezes for special applications (Table 8) on page 17).

The product BASF G206 (see Chapter 6) is available for use at extremely low temperatures (< –40

°C) (→ Page 37). Specifications for concentrations are in accordance with (→ Table Calc. table for

corrosion-inhibiting antifreezes for special applications (Table 8) on page 17).

Water-soluble corrosion inhibitors

General information

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 exchanger) and TE-systems in Series 396, 4000 and 183 engines.

For Series 8000 engines, only water-soluble corrosion-inhibitors in accordance with

Chapter 6 may be used. (→ Page 37)

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

concentrations are u sed. The relevant concentration range for use is listed in the section on Operational Monitoring

(→ Table Permissible concentrations (Table 6) on page 16) under “Water-soluble corrosion inhibitors”.

Special arrangements are possible after consultation with MTU. Special arrangements presently in effect remain valid.

Note:

Flushing with water is required during every product change. This also applies to new engines.

The work involved and cleaning agents required are described in the MTU Flushing and Cleaning

Specifications (see appendix to these Fluids and Lubricants Specifications).

Coolant additives for aluminum-free engine series (Series 2000

C&I, Series 4000 C&I/Genset)

For Series 2000 C&I, Series 4000 C&I and Series 4000 genset engines, all of the coolant additives listed in Chapter 6

as being suitable for light-alloy-free engines may be used. (→ Page 37) The restrictions listed under “Remarks” with.

The coolant additives listed in Chapter 6 must not be used for any other engine series! (→ Page 37)

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 b

e 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 c ontent

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