How To Disassemble A Lower Ball Joint In A Hyundai Elantra 1997?

The ball joint is connected to the steering knuckle w/ a tapered connection, called a steering taper, which also is used in other steering connections. To remove a ball joint requires the use of a special tool called a ball joint separator or a pickle fork.  Another way of "breaking" the taper is to use a large hammer.
1st-  Remove the cotter pin from the ball joint nut & loosen the nut several turns.
2nd- Position the vehicle so that the coil spring is pushing on the ball joint.  This could require lifting the vehicle OR allowing the weight to rest on the wheels.
3rd- Use a hammer to pound sharply on the steering knuckle on the outside of the taper.  This will deform the taper & spring pressure will separate the ball joint from the steering knuckle.
*If the control arm has been removed from the vehicle, a standard hydraulic press can be used to remove the ball joint.  If control arm is still in car, a special press set is needed for removal & installation.
* Some pressed fit ball joints have a spot weld that holds them in place.  This must be carefully removed. When a replacement ball joint is installed, a snap ring often takes the place of the weld.