MTU 12 V 4000 M63 Specifikace stáhnout pdf (Strana 105)

Flushing and cleaning speciﬁcations for engine coolant circuits 103

In the case of powdered products, stir until the detergent is completely dissolved and without sediment.

Pour solution together with fresh water into coolant circuit.

Start engine and run until warm.

Run engine for approx. 2 hours at increased speed.

Shut down engine.

Drain off cleaning agents and ﬂush the engine coolant circuit with fresh water.

Take ﬂush-water sample (engine-coolant-sample extraction cock).

Measure pH-value of the ﬂush-water sample (MTU test kit or electric pH-value measuring device).

If pH-value after ﬂushing is only slightly above pH-value of fresh water, (pH-value difference < 1):

Fill system with treated coolant and start engine.

If pH-value after ﬂushing is still signiﬁcantly above pH-value of fresh water, (pH-value difference > 1):

Cleaning components

For further information, see Operating Instructions for engine in question.

Cleaning components

Remove, disassemble and clean components that are exposed to heavy sludge deposits e.g. expansion

tanks, preheating units, heat exchangers (coolant cooler, oil heat-exchanger, intercooler, charge-air

preheater, fuel preheater etc.) and lower sections of pipework.

Before cleaning, examine degree of contamination on water sides.

If greasy lime deposits are found, ﬁrst degrease the water side.

Stubborn deposits caused by oil mist in intercoolers can be removed with Kluthe Hakutex 60.

Remove hard lime deposits with a decalcifying product.

In the event of stubborn lime deposits, a 10% inhibited hydrochloric solution may have to be used.

Dissolve deposits on and in heat-exchanger elements in a heated cleaning bath.

Use only approved detergents in the permissible concentration.

Always follow the manufacturer’s instructions when preparing cleaning baths!

• Deposits on the oil side can also be dissolved in a kerosene bath.

• The period spent in the cleaning bath depends on the t ype and degree of contamination,

as well as the temperature and activity of the bath.

Clean individual components such as housings, covers, pipes, sight glasses, heat-exchanger elements

and similar with superheated steam, a nylon brush (soft) and a powerful water jet.

In order to avoid damage:

• Do not use hard or sharp-edged tools (steel brushes, scrapers etc.) (oxide protective layer)

• Do not set the water-jet pressure too high (damage, e.g. to cooling ﬁns)

After cleaning, blow through the heat exchanger elements with low-pressure steam in the direction opposite to

operational ﬂow, rinse with clear water (until pH-value difference is < 1) and blow dry with compressed or hot air.

Check that all components are in perfect condition, repair or replace as necessary.

Flush oil and engine coolant sides of heat-exchanger elements with corrosion-inhibiting oil.

• This step may be omitted if the heat exchanger is installe d and taken into service immediately after cleaning.

After reinstalling all components, ﬂush engine-coolant system once.

Check coolant system for leaks during initial operation of engine.

For further information, see the Maintenance Manual for the engine in question.

Coolant circuits contaminated with bacteria, fungi or yeast

System cleaning

The system cleaner must ﬂow a sufﬁciently long time through the complete cooling system

to ensure effective cleaning and disinfection.

Therefore, the predeﬁned amount of the approved system cleaner must be added to the contaminated coolant in the

system. Use a circulating pump to provide continuous mixture ﬂow through the coolant system for at least 24 hours.

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