Notice: Some frames are constructed of heat-treated steel. Do not weld or drill these frames. The use of heat in excess of 606°C (1200°F) can weaken, cause distortion, and change the characteristics of the steel.
Frame straightening may be a complicated process and usually requires some special equipment. Only trained technicians should perform a frame straightening procedure.
Before beginning the straightening process, conduct a complete analysis of the frame and underbody of the vehicle. Analyze the frame and underbody accessories, and the frame and underbody conditions in order to determine the correct sequence of steps for the repair procedure. Refer to Minimizing Frame Service Description . Identify the frame material before beginning the repair procedure. Refer to Frame and Underbody Description .
Adhere to the following instructions while conducting the repair procedure:
| • | Apply pressure from different directions in order to reverse the flow of damaging forces. |
| • | Control the temperature and the application of the heat. |
| • | Heat the frame using a large-sized, multi-hole heating tip, and a neutral flame. Keep the oxygen opened just enough to remove the feathers or the stringers from the blue center at the tip of the torch. |
| • | Heat the area that will be stretched as the frame is straightened. |
| • | Heat the area after exerting sufficient pressure. A slight checking or some silvery cracks will appear on the surface of the metal when heating is at an adequate pressure. |
| • | Gradually increase the pressure while heating the metal. |
| • | A red glow is an indication of overheating. |
