Car hinge pins that are worn and in poor working condition can cause significant damage to your vehicle--the car door may droop and not open and close correctly. The weight from a drooping car door may result in the car door itself being damaged or even the body of the car being damaged. Replacing the hinge pins on your vehicle may seem like a complicated process; however, with the proper equipment and a little time, your car door will be working perfectly.
Set up a jack stand to hold the car door while you're removing and reinstalling the hinge bins. Drape the jack stand with an old towel or sheets to protect your car door's paint. Open the car door and rest it on the jack stand so the car is stabilised during the hinge pin replacement process. Engage the parking break.
Align a punch with the bottom tip of the bottom hinge pin. The bottom tip is facing down.
Hammer the punch with a hammer. Use enough force to drive the bottom hinge pin from its location, but not so much that the car sustains any damage.
Align the punch with the bottom tip of the top hinge pin. The bottom tip is facing up.
Hammer the punch with the hammer. Use enough force to drive the top hinge pin from its location, but not so much that the car sustains any damage.
Ensure the car door hinges are still aligned post-hinge pin removal: the hinge-bracket portion on the car door should fit against the portion connected to the car body.
Insert the new upper hinge pin into its bracket, with the hinge pin pointing upwards.
Secure the upper hinge pin into its bracket with the punch.
Insert the lower hinge pin into its bracket, with the hinge pin pointing down.
Secure the lower pin into its bracket with the punch.
Place new locking rings onto the grooves located at the hinge pins' tips.
Hammer the locking rings so that they are secured onto the hinge pins.
In addition to the jack stand, a friend can also help you stabilise the car door while you replace the hinge pins. After replacing the hinge pins, it's always a good idea to apply some lubricant to the car door hinges.