MTU 12 V 4000 M63 Specifikace stáhnout pdf (Strana 90)

88 Preservation speciﬁcations

• Fill with or renew coolant

Depreservation is not required on installed ﬁeld engines with out-of-service periods up to 3 m onths.

Only the covers must be removed (→ Page 84).

Note on commissioning:

Put engine into operation according to the engine documentation.

Special packing

Special packing must be carried out for engines which are to be taken out of service for more than 36 months. For

engines to be stored outdoors or to be transported by sea or in polar or tropical regions, special packing should be

carried out immediately after preservation, see S ections (→ Page 84)and (→ Page 86). Likewise, special packing is

also usually advisable for protecting the engine against corrosion during shorter periods of storage .

Coolant and preservative oil must be drained completely for special packing.

The following types of special packing are available:

• Envelopes of bonded-layer material (e.g. aluminum bonded-layers).

• Hygroscopic (water-absorbing) materials (e.g. silica gel).

The engine is welded into a foil with limited water-vapor permeability, the enclosed air is then extracted by

means of a vacuum-cleaner, and is dried to the desired relative humidity with desiccant. Desiccant is used

to achieve a speciﬁc relative humidity inside the foil envelope. The climatic packing of bonded-layer material

hinders the formation of condensed water on the metal surface and resulting corrosion.

Maintenance intervals

• Check the humidity indicator every 3 to 4 months (→ Page 90).

• In cases of storage for more than 10 years (from date of manufacture on identiﬁcation plate) but before putting

into service, all rubber components (sleeves, hose lines, etc.) on the engine must be replaced.

• Storage beyond 20 years (as of year of manufacture on nameplate) but before commissioning, all

elastomer components must be replaced as part of a major engine overhaul.

Note:

When storing the engine in special packing (with laminated-aluminum layers), note that the elastomers

have a limited life. The calculation of the total service life of the elastomers begins with either the year of

manufacture or last engine overhaul (see nameplate). Based on current knowledge, elastomer components

made of ﬂuorocarbon rubber (e.g. O-rings) have a total service life of about 20 years and those made

of other rubber materials (hoses) have a total service life of about 10 years.

A long storage period shortens the time limit for an engine’s major overhaul (TBO) because of

the limited total service life of the elastomers. MTU Friedrichshafen GmbH recommends that

engines should not be stored for more than 10 years.

General information on special packing

Envelopes of laminated material

The envelopes consist of tightly-bonded layers of aluminum composite foil which has

limited permeability to water vapor and gas.

The m aterial used by MTU Friedrichshafen GmbH is composed laminated aluminium foil made of

polyethylene – aluminum and polyester, with the following properties:

• Temperature range for applications from +70 °C to –50 °C.

• Water vapor permeability (WVP): 0.1 g/m² per day at 38 °C and 80% relative humidity

(compared with PVC soft foil: WVP 6 g/m² per day)

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