A coil spring compressor is a tool used to compress coil springs of an automobile so it may be easily and safely removed from the A-arm of the vehicle's suspension. This tool consists of a pair of spreadable jaws mounted on a through-bolt. The tool is inserted inside the spring, the jaws are spread to engage the coil, and then the through bolt is turned to compress the spring. Once it is compressed enough to remove, the process can be reversed and the through bolt backed off until it has unloaded in a safe, controlled manner.
Over time, these springs can become fatigue and weakened, resulting in reduced quality in ride and handling, and poor tire alignment. When this happens, they need to be replaced. For most home mechanics to tackle this job, a good compressor is necessary. It is vital to use one built ruggedly enough for the job, because an automobile's coil springs store a great deal of potential energy and can inflict severe bodily harm if they suddenly decompress without warning.
Air Compressor
Failure is not an option when it comes to this particular tool. One should choose compressors of good quality from a reputable company and carefully expect the jaws, through-bolt, and threads for signs of damage or fatigue before each use. One should always follow the manufacturer's guidelines on capacity and usage when operating the compressor. If the springs of the vehicle to be worked on are coated with vinyl or similar anti-rust coating, the jaws of the compressor one uses should be similarly coated so as to avoid scuffing or scraping the spring's protective coating off and exposing the metal beneath.
Many reputable automotive tool companies manufacture a coil spring compressor. They are generally available for between .00 and 0.00, depending upon capacity. Be sure to comparison shop to get the best deals.