Where to Position the Jack When Changing a Wheel?
2 Answers
When changing a tire, the jack should generally be positioned about 10-20 centimeters away from the tire. Here are some key points to note: 1. Chassis guard plate: Never place the jack directly under the chassis guard plate or the lower control arm of the suspension. Incorrect jack usage or supporting the vehicle at the wrong points can easily cause damage. 2. Hard surface: The correct procedure is to park the vehicle securely, preferably on a level surface, engage the parking brake (for automatic transmission vehicles, shift into P), and ensure the ground where the jack is placed is firm. 3. Hazard prevention: If the ground is soft (such as sand, grass, or mud), it's advisable to place a hard wooden board or stone slab under the jack to prevent sinking or slipping.
I've been running an auto repair shop for over a decade and have seen too many people damage their chassis by jacking at wrong positions. When changing tires, the jack must be placed at the dedicated support points underneath the vehicle - these are located on the metal beam beneath the doors, usually marked by small protrusions or indentations. If you can't locate them visually, get down and feel with your hand; these spots will feel noticeably thicker than surrounding sheet metal. Never jack on plastic fender liners, fuel tanks, or suspension components - these areas can't bear the weight and may either deform or cause dangerous collapses. Always engage the parking brake and shift to Park before lifting. Choose firm, level ground and use wheel chocks on the diagonal tire. If the support point isn't properly aligned, the vehicle will creak and wobble when lifted - immediately lower it and readjust in such cases.
