GENERAL
Page GENERAL-50 Z001019/0_8_Octobre 2011
SERVICE MANUAL MARINE ENGINES
ToC
H 3 Testing of torque wrenches
The torque wrenches are subject to regular tests of the set values. By doing so, the tripping value of
signalling torque wrenches and the scale accuracy of measuring torque wrenches are tested.
H 4 Non-destructive material testing
For the detection of surface cracks, the non-destructive test according to colour penetration test
procedure is recommended.
The workpiece is sprayed or coated with a penetration agent, and after drying a developer is applied. After
a development time of appr. 10 minutes, defects on the workpiece appear as dots or lines.
H 5 Use of adhesive and sealing materials
In the workshop manual adhesive and sealing materials are specified for the repair of engines and
aggregates, which are used at operating temperatures of up to 150° C and agents such as water, coolants
and hydraulic fluids, engine and gear oils as well as fuels.
Solvent-free sealing materials
The hardening takes places without loss of volume, so that a retightening of screw connections is not
necessary.
Anaerobic sealing materials
These are used for securing, fixing and sealing, and only harden under exclusion of air.
Solvent containing sealing materials
Due to their contents of volatile parts a loss of volume occurs during hardening. During repair, the
hardening time is taken into consideration. If such sealing materials are used, special reference is made
in the description of the workshop manual.
H 6 Solvent-free sealing materials
Silicon sealing materials
They consist of silicon and filling materials and are free of solvents.
The product is applied to the cleaned sealing surface from the tube or cartridge in form of a string. Sealing
material residues are removed with cleaning agent.
Silicon sealing material is to be stored below 30° C.
Anaerobic sealing materials
They consist of a single component epoxy in liquid form. The product is applied as a liquid to the
components and remains liquid, as long as it is in contact with ambient air (oxygen). Only when the
parts are assembled, chemical reaction starts due to exclusion of air (oxygen) and metal contact, i.e.
transformation of liquid state into an epoxy built up by molecular chains.
Any residues remaining after assembly and/or are pressed out of the connection remain liquid and may
be removed easily.
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