Q45 V8-4.5L (VK45DE) (2002)
Glass is produced by fusing together various raw materials such as silica, soda ash, and limestone, and has hardness of 5 to 6 on the Mohs scale (for
reference, a diamond has a hardness of 10 on the same scale).
Since earth and sand can contain substances harder than that of glass, glass can be easily scratched by:
^ Fine sand particles
^ Hard metal
^ Rubbing action of contaminated wiper rubbers, or sand partials caught between the wiper and the glass, especially when operating the wipers in a dry
condition.
A magnifying glass (10X magnification) must be used to identify wiper scratches as a start point of cracks in the glass.
^ Inspect the wiper paths (may be a single scratch of a group of scratches)
^ Small scratches can cause a small rupture in the outer glass surface, which can lead to a crack from thermal conditions, vehicle vibration during
driving, or wind pressure.
A magnifying glass (10X magnification) must be used to identify metal object scratches as a start point of cracks in the glass.
^ Scratches can occur from metal objects such as keys and metal buttons. These scratches are typically sharp and can be found anywhere on the glass
surface.
^ Thoroughly examine the entire length of the crack to identify any scratch as a start point.
^ Small scratches can cause a small rupture in the outer glass surface, which can lead to a crack from thermal conditions, vehicle vibration during
driving, or wind pressure.
A magnifying glass (10X magnification) must be used to identify scratches caused by a contaminated towel as a start point of cracks in the glass.