Seized Bolts

Got a stuck bolt? Step one: don’t panic. Step two: get some advice from an expert, and we’ve got just the one. Audra Fordin on how to get it unstuck on this week’s “Your Drive.”

AUDRA FORDIN: One of the most frustrating feelings in the world is twisting a wrench and nothing happens…No twisting, no budging, just a stubborn bolt that refuses to move. This is usually caused by rust, but chemicals and previous overtightening can cause it too. Regardless, there are a number of ways to get things moving.

The most common solution is to hit the part with a penetrating lubricant. Now, after you’ve put on your glasses and your gloves, you’re going to spray that part liberally… Like really hit those areas where the two parts meet. The more corroded, the more you should spray. And then, let it sit. These lubricants need time to do their magic. Usually like 15 minutes or so, but sometimes it can take an hour or overnight. And then, well, give it another crank. With any luck at all, it will start to give. Well, if you can only get it halfway out, stop. Apply more lubricant, and repeat those steps. But, let’s say that isn’t enough.

Our next trick is one you may consider from the very beginning. When in doubt, let physics work for you. Yup, grab a bigger wrench, and a bar to give you mechanical leverage. Now, did you know that screwdrivers do more than just drive in screws? By sliding the screwdriver through the jaws of a wrench, you can increase the torque that you’re able to apply. Now, this is extremely helpful when you’re working with seized threads and in tight places. But, disclaimer: when doing this, please be careful. You don’t want to suddenly break the bolt loose and then send your hand flying into a fender; which means wear gloves, apply pressure evenly, especially if the car is standing on jack stands.

Okay, so lubricant and a persuader bar still aren’t helping? Well, in the shop, we like to introduce the torch and use heat. Why? Because this expands the parts and can get things moving. But, another disclaimer, only introduce a flame away from flammable components. Now, if you’re fortunate enough to have an air compressor, a pneumatic impact tools can also be your best bet. An impact wrench gives you rapid bursts of air-powered energy, shocking the bolt until it comes loose. This can break apart some of the rust, but again, be careful because too much of those rapid bursts and you could strip the bolt head.

In this case, you can try using a bolt extractor. Now these kits allow you to bore into the stripped bolt and remove it without damaging the threads. Just follow the guide provided with the kit and you’ll be on your way to a loose bolt.

Working with stubborn parts is never fun, but hopefully these tips can help alleviate some of your woes. If you have any questions or comments, reach out to us right here at MotorWeek.