Man D 2842 LE 620, Repair Manual

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Instructions
2
Important instructions which concern technical safety and protection of persons are emphasised as shown
below.
Danger:
This refers to working and operating procedures which must be complied with in order to rule out
the risk to persons.
Caution:
This refers to working and operating procedures which must be complied with in order to prevent
damage to or destruction of material.
Note:
Explanations useful for understanding the working or operating procedure to be performed.
Fitting flat seals / gaskets
Flat seals / gaskets are often inserted with sealing agents or adhesives to make fitting them easier or to
achieve better sealing. Flat seals may slip in operation due to the “sewing-machine” effect, in particular if
they are used between parts with different rates of linear expansion under heat (e.g. aluminium and cast
iron), and leaks may then occur.
Example:
the cap of the front crankshaft seal. If a sealing agent or an adhesive is used here the flat seal will move
inwards in the course of time as a result of the different expansion rates of the materials. Oil will be lost, for
which the shaft seal may be thought to be responsible.
Flat seals / gaskets can be fitted properly only if the following points are observed:
D
Use only genuine MAN seals/gaskets.
D
The sealing faces must be undamaged and clean.
D
Do not use any sealing agent or adhesive − as an aid to fitting the seals a little grease can be used if
necessary so that the seal will stick to the part to be fitted.
D
Tighten bolts evenly to the specified torque.