Fastener Loosening - Honda Motorcycle Service Manual

GENERAL INFORMATION
FASTENER LOOSENING
In most of the cases, fastener loosening is due to external
forces repeatedly applied to, or working against, the fastener
(such as vibration), thus reducing screw axial tension.
Installing common bolts in these areas with special re-
quirements may lead to loosening or shearing of the fastener.
Therefore it is important to identify both these specially
designed bolts and the positions where they are required.
Follow any special bolt instructions given in the Model
Specific manuals.
FATIGUE
t
Certain areas of a motorcycle or scooter are subject to
repeated and severe external forces. Special bolts with a high
percentage of elastic deformation capability are used in these
areas.
Always clean fasteners thoroughly if there is any dirt present
anywhere on the fastener.
S p E E
Installing fasteners with dirt or other foreign matter on their
threads or on the bolt or nut bearing surfaces will result in im-
oroper axial tension, despite the use of the proper torque
rP\
.
.
specification.
As the dirt or foreign matter breaks down due to vibration and
the attached parts working against each other, the fastener
will soon work its way loose.
FOREIGN MATTER
There are several methods of preventing the various types of
fasteners from loosening. Some representative examples are
presented on the next page, together with the necessary
instructions for proper use.
1-12
Date of issue: March,
1995
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HONDA MOTOR CO.,LTD.