gio Vyper 4WD 1100cc 4 seater XY1100UEL, Service Manual

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1. SERVICE INFORMATION
1-4
Self-Locking Fasteners
Several types of bolts. Screws and nuts incorporate a system that creates interference between
the two fasteners. Interference is achieved in various ways. The most common types are the nylon
insert nut and a dry adhesive coating on the threads of a blot.
Self-locking fasteners offer greater holding strength than standard fasteners, which improves their
resistance to vibration. All self-locking fasteners cannot be reused. The materials used to from the
lock become distorted after the initial installation and removal. Discard and replace self-locking
fasteners after removing them. Do not replace self-locking fasteners with standard fasteners.
Washers
The two basic types of washers are flat washers and lock washers. Flat washers are simple discs
with a hole to fit a screw or bolt. Lock washers are used to prevent a fastener from working loose.
Washers can be used as spacers and seals. Or can help distribute fastener load and prevent the
fastener from damaging the component
As with fasteners. When replacing washers make sure the replacement washers are of the same
design and quality
Cotter Pins
A cotter pin is a split metal pin inserted into a hole or slot to prevent a fastener from loosening. In
certain applications, such as the rear axle on an UTV or motorcycle, the fastener must be secured in
this way. For these applications. A cotter pin and castellated (slotted) nut is used.
To use a cotter pin, first make sure the diameter is correct for the hole in the fastener. Aster
correctly tightening the fastener and aligning the holes, insert the cotter pin through the hole and
bend the ends over the fastener, Unless instructed to do so, never loosen a tightened fastener to
align the holes. If the holes do not align. Tighten the fastener enough to achieve alignment
Cotter pins are available in various diameters and lengths. Measure the length from the bottom of
the head to the tip of the shortest pin.
Snap Rings and E-clips
Snap rings (
Figure 1
) are circular-shaped metal
retaining clips. They secure parts in place on parts
such as shafts. External type snap rings are used to
retain items on shafts. Internal type snap rings secure
parts within housing bores. In some applications. in
addition to securing the component(s). snap rings of
varying thicknesses also determine endplay. These
are usually called selective snap rings.
The two basic types of snap rings are machined
and stamped snap rings. Machined snap rings (
Figure
2
) can be installed in either direction. Because both
faces have sharp edges. Stamped snap rings (
Figure
3
) are manufactured with a sharp and a round edge.
When installing a stamped snap ring in a thrust