Dealing With Swelled Lug Nuts

Dealing With Swelled Lug Nuts

On a lot of vehicles made during the past 20 years, the manufacturer used a two-piece lug nut that has a chrome cap over the steel lug nut. On the new car lot, these look good on a nice set of alloy wheels. But, in as little as three years, the lug nuts could swell and make removal difficult.

On a lot of vehicles made during the past 20 years, the manufacturer used a two-piece lug nut that has a chrome cap over the steel lug nut. On the new car lot, these look good on a nice set of alloy wheels. But, in as little as three years, the lug nuts could swell and make removal difficult.

The problem with these lug nuts is that water and salt gets between the nut and cap. The resulting corrosion causes the cap to swell and change the outer diameter of the nut. For the driver, this often means the lug wrench in the trunk will no longer fit when they need to change a tire by the side of the road.

For a technician, it could mean extra time and tools to remove the lug nut. It is not impossible, but the key is to identify the problem before you make it worse. The rookie mistake is to grab the next larger size socket and use an impact wrench. This method can dislodge the chrome cap, but it can also round off the harder nut under it. Senior technicians know that not too many lug nuts come in 18mm, 20mm or 22mm sizes, so if they feel resistance when trying to get the socket over a lug nut, they put down the impact before they make it worse. The impact is a great time saver, but it lacks the feel and overall torque of a good breaker bar. A good technician also knows the feel of a properly engaged nut and socket with a breaker bar better than an electric or pneumatic impact.

Some technicians have purchased over-sized sockets in 19.5mm and 21.5mm size to remove swelled lug nuts. Some technicians have had luck with 12-point sockets in 11/16” and 3/4” sizes. Using these slightly oversized sockets involves hammering the socket over the swelled lug nut and using a breaker bar. Unfortunately, sometimes the lug nut then becomes permanently lodged in the socket and won’t come out.

The worst-case scenario is that a previous technician damaged the lug nuts with his impact and now you have to deal with it. In these cases, a drill bit or rotary broach bit might be your only solution.

You May Also Like

The Winter Tire Opportunity – Now Is The Time

Winters tires aren’t just a luxury, it’s your job to tell your customers the positive impact that the tires can give them.

It was a frigid February morning in Chicago last year. The kind of cold that creeps into the depths of your lungs, making it difficult and even a little painful to breathe. The kind of cold that literally takes your breath away. The snow was falling as I stepped into my car and took off across The Chicago Skyway with the city lights in my rear view. It was around Gary, Indiana, that the lake effect snow engulfed Interstate 90 and made it impossible to see the road more than about 15 feet ahead as I made an unwise attempt to pass a massive snowplow in the right lane. And, it was this moment that I understood the difference between an all-season tire and a true winter tire. My life as a “tire guy” would never be the same again.

Diagnosing Audi A8 TPMS Issues

These are all the steps you’ll need to pinpoint fault issues in TPMS for 2009-2016 Audi A8 vehicles.

The Rule of 3X Tire Rotation

Proper rotation procedures maximize tread life and customers coming back.

Communicating The Effectiveness Of TPMS

A good angle to start with may be laying out the consequences of not having a working TPMS.

Servicing Tires With 18-In.-Plus Rims

Servicing any tire and wheel assembly correctly starts with having the right equipment.

Other Posts
TPMS Valve Stems – What Are The Trends? What Is The Future?

Whatever the type of stem, carelessness can result in a broken sensor or even a customer being stranded with a flat tire.

Nissan TPMS Service

The behavior of the TPMS systems is very consistent across all Nissan models.

Free Webinar: Don’t Be Intimidated By TPMS Service

Fundamentals of Fast and Efficient TPMS Service will help you organize your TPMS program for maximum effectiveness.

Charging For TPMS Service

Like any other product or service, charging for a TPMS service can be a bit of a science.