- V​ice Grips locked on the face of a jack nut.

What is a jack nut? Consider this before working on your car

5w ago

119.2K

Having your car work done by professionals can be expensive, but we count on those people to have the tools and expertise to do the work properly. Still, wouldn’t it be nice – at least once in a while – to do simple work on your car by yourself and save that labor cost?

T​he Mazda MX-5 Miata before the front and rear mud flaps were installed.

I wanted to protect my brand new, 2019 Mazda MX-5 Miata from rocks, road debris, oil and tar. I’d already had paint protection film installed on the front end and along the rocker panels (see AutoMatters & More #604, entitled “XPEL ULTIMATE PLUS Paint Protection Film & Installation by Auto Armour”), but I wanted to do even more to protect it.

Mazda struck a nice balance between functionality and appearance for their Genuine Mazda Accessory Mud Flaps (“Splash Guards”), saying their purpose is to “protect your paint finish from rocks and other road debris.” These come pre-painted in most Miata body colors, although not in my car’s limited edition color of Racing Orange. Since that color was not offered, I chose the gloss black finish, since my car’s mirrors are black, as is the trim below the rocker panels. The blacks are not the same, but they are close enough.

T​he installed rear, right side mud flap.

I learned from Mazda that these mud flaps come with instructions. I thought that installation must surely be very simple, since the mud flaps are so small and simple. I’m fairly handy with mechanical things, so I decided to save the $135 installation charge quoted by my Mazda dealer and do it myself.

When the special-order parts arrived, that was my first opportunity to see their installation instructions. I had assumed that all I would probably need for tools would be a screwdriver, since these mud flaps were specifically designed for my car by Mazda. Oh how wrong that assumption was.

I began the work, which the dealership said should take about two to three hours, mid-afternoon on Labor Day Monday. I figured I’d finish the installation in plenty of time to have dinner afterwards.

There were different instructions for the front and rear mud flaps. The “REQUIRED TOOLS” for the front mud flaps were: drill (3mm, 6mm, 10mm bits), punch, fastener remover, jack nut tool, nippers (vehicles with i-ELOOP only) and utility knife (vehicles with i-ELOOP only). Oh boy! What had I gotten myself into? I needed to try to determine, on a holiday, what i-ELOOP is and does my Miata have it? Extensive Google searches suggested that is not a U.S.-spec Miata feature.

I decided to tackle the rear mud flaps first. The instructions for those looked easier. ‘All’ I had to do was unclip and remove the splash shields from the rear wheel wells (attached with a combination of specialty fasteners and screws), cut out rectangular slots from the splash shields with “nippers,” attach “clip nuts” to the rear bumper, and carefully install each mud flap “while pressing the mud flap against the vehicle so that there are no gaps.” To do all of that I needed to jack each corner of the car up off of the ground to get the tires out of the way, but my Miata did not include a jack!

Genuine Mazda mud flap fastened on to the splash shield in the rear, right side wheel well. The mud flap covers up the cut out rectangular slots.

C​lose-up view of the installed rear, right side mud flap.

Eventually with the rears done, I shifted my attention to the fronts. As with the rears, I needed to jack up the car – but this time high enough to fit a power drill underneath.

S​ince I do not have a lift, and my model of 2019 MX-5 Miata did not come with a jack, I tried this one from Wal*Mart. It worked, providing sufficient room underneath the car to drill the required hole in the plastic panel. I covered the business end of the jack with several thicknesses of paper, to protect the Racing Orange paint.

The biggest problem that I had was installing the jack nuts, which are sort of like wall anchors that you push through a hole in the drywall, and then tighten to the drywall by turning a screw. The problem with the jack nuts was that they were to be installed on a relatively thin sheet of plastic. Without the proper tool, they would just spin in the to-be-drilled hole if I tried to tighten them down onto the backside of the plastic. Undeterred, I used a pair of needle-nose Vise Grips to hold the face of the fastener while I tightened a metric machine screw (that I also had to get).

I used needle-nose Vise Grips to lock on to the face of the jack nut, to try to keep it from turning when I tightened its fingers to the back side by turning a metric machine screw. If the edge of the face of the jack nut was shaped like the edges of a hex bolt, holding it still would have been much easier.

It was very hard to turn the screw, and the Vise Grips had trouble gripping the round face of the fastener, but eventually I succeeded.

W​hile holding the Vise Grips stationary with one hand, I turned the machine screw with a screwdriver. That required me to apply a great deal of pressure while laying on my back, looking up and not letting the screwdriver jump out of the screw head. The Vise Grips kept slipping and needed to be tightened several times for both jack nuts, but I avoided having to buy an expensive jack nut tool or paying a professional.

I worked in very close, awkward quarters to install the jack nut, while maintaining sufficient leverage to keep the Vise Grips from moving and to turn the screw. To take this photo, I held my iPhone facing towards me.

T​he backside of the tightened and compressed jack nut, securely gripping the thin plastic panel at the bottom of my car.

A​nother view of the plastic panel on the underside of my Miata, with the jack nut attached.

The front, right side mud flap, showing where it is screwed into the jack nut.

T​he leading face of the front, right side mud flap.

T​he wraparound, front, right side mud flap.

Between running around looking for tools, doing research on the Internet and working under my car without the benefit of a hoist, this ‘simple’ job ended up taking me until almost 7 a.m. You might want to consider my experience when considering working on your car.

Copyright © 2019 by Jan Wagner – AutoMatters & More #606

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