Collision Repair Training | United States
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Current Events/News: Advantage Online: 2001 Archives
ADVANTAGE ONLINE: 2002 GM MID-SIZED VANS OFFER STEP-ASSIST MADE OF ADVANCED THERMOPLASTIC OLEFIN (TPO) NANOCOMPOSITE
December 7, 2001 -The step-assist, or running board, which is designed to help people into and out of a vehicle, is being offered as a dealer-installed option on 2002 GMC Safari and Chevrolet Astro Vans. The step-assist is made from an advanced thermoplastic olefin (TPO) nanocomposite material. This is a first in exterior automotive applications. Nanocomposites are made by introducing a solid material, in this case tiny flakes of clay, into a plastic resin to give it added strength and other positive properties. This clay material is only a nanometer (one-millionth of a millimeter) thick, compared to that of the filler material used in conventional TPOs, which on average is one thousand times thicker. Nanocomposites are much stronger than conventional TPOs, as well as stiffer, lighter and less brittle in cold temperatures, therefore able to withstand more abuse. Step-Assist Repair Method It is anticipated that this type of advanced TPO nanocomposite material will make its way into future exterior automotive applications. It has yet to be determined what type of repair method, if any, can be used on this type of material. As additional automotive applications are introduced, a repair procedure will need to be researched and tested. Removal And Installation Considerations The step-assist is attached to the rocker panel, pinchweld flange, and the rear wheel well. Parts of the step-assist that require removal and installation include the front and rear extension, rear anchor, pad, plate, and support brace, bracket, and retainer. Replacing the step-assist also requires the removal and installation of many screws, nuts, bolts, brackets, clips, and retainers. When replacing the step-assist, there are a few considerations to keep in mind. Do not use a sharp tool to remove the step-assist retainer. Doing this will damage the paint. Instead, use a plastic tool. Double backing tape is used to hold the retainer in place. Before installing the replacement step-assist, the rocker panel will need to be cleaned with isopropyl cleaner to remove the old double backing tape. It is imperative that the correct fastener be used in the proper location. It is important to not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless noted. These types of coatings affect fastener torque and joint clamping force and may damage the fastener. Be sure to use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. For the specific removal and installation steps, the vehicle-specific service manual will need to be referenced. |
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