Page 80 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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Figure 1.92 Loctite® Threadlocker. (Source: © 2010 Henkel AG & Co. KGaA, Düsseldorf. All
rights reserved)

Another common method of securing threads is to use a locking compound such
as Loctite®. This is in effect an adhesive which sticks the threads together. When
the correct compound is applied with care, it is a very secure way of preventing
important components from working loose ( Fig. 1.92 ).

1.6.9 Adhesives

A very wide range of adhesives is used in today’s automotive industry. The number
of applications is increasing daily and tending to replace older methods such as
welding. There are too many types of adhesives to cover here but most of the basic
requirements are the same. It is very important to note, however, that manufacturers’
instructions must always be followed. This is because of the following: Safety fi rst

Many adhesives give off toxic fumes and must be used with care. Manufacturers’ instructions must
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Most types are highly fl ammable. always be followed when working
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with adhesives.
Adhesives are often designed for a specifi c application.
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Adhesives also have a number of important terms associated with them:
Cleanliness – Surfaces to be joined must be clean.
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Curing – The process of setting, often described as ‘going off’.
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Wetting – The adhesive spreads evenly and fully over the surface.
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Thermosetting – Heat is required to cure the adhesive.
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Thermoplastic – Melts when heated.
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Contact adhesive – Makes a strong joint as soon as contact is made.
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‘Super glue’ – Cyanoacrylate adhesive which bonds suitable materials in
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seconds, including skin – take care!
Adhesives have many advantages, which is why they are becoming more widely
used. These include:
even stress distribution over the whole surface
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waterproof
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good for joining delicate materials
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no distortion when joining
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a wide variety of materials can be joined
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a neat, clean join can be made with little practice.
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