2014 Rear Wiper Removal

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I need to replace the rear wiper arm on my 2014 SR5. I got the nut off the wiper arm stud but could not get the arm to budge. I sprayed it with PB Blaster and let it sit overnight. This morning I still couldn’t get the arm off so grabbed a puller from the local AutoZone. All I could accomplish with that is to break the plastic on the arm. That did allow me to get the arm off but not nut that the plastic surrounded.

In the photos, the toothed nut on the stud was part of the arm and is supposed to come off, right? I put a vice-grips on it but it is not turning. It’s now sitting in PB Blaster. I’m reluctant to use a torch on it because of the rubber cover below the nut.

Before I really Strongarm it I want to make sure I’m not missing something, like a retaining clip hidden by the rust.
Thanks

 

[jp.vegas]

That nut doesn't come off, the plastic wiper arm indexes on that nut; it has multiple "teeth" so that you can adjust the position of the arm so that it falls in the right place when retracted and covers the correct amount of the window when in motion.

 

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That nut doesn't come off, the plastic wiper arm indexes on that nut; it has multiple "teeth" so that you can adjust the position of the arm so that it falls in the right place when retracted and covers the correct amount of the window when in motion.

That doesn’t sound correct. Looking at a new OEM Toyota wiper arm for a 2014 SR5 4Runner (left photo), you can see that nut is part of the arm. The teeth are fully embedded in the plastic, so they couldn’t engage anything. It slides onto the stud and the arm is secured with the flanged nut. The arm wouldn’t fit on the stud if that nut is left on.
The right photo shows the aftermarket arm I bought that fits my vehicle. The metal insert doesn’t have the large teeth but instead has many more smaller teeth.

 

[AuSeeker]

Get a "nut splitter" to crack/split it to get it off.

 

[Humble Leader]

when I replaced my rear wiper motor I also bought a new wiper arm. that wiper nut sits on the stud and when you tighten the bolt down to secure it the teeth on the stud dig into the metal of the wiper arm nut and keep it in place

the problem is that wiper arm just rusts right onto the wiper motor stud. you can try and split it but you'll probably break the stud off or ruin the teeth. if that happens you'll need a new wiper motor

when I tried to remove the wiper arm I broke the plastic arm the same way you did

 

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I managed to get the nut off with a Dremel without damaging the shaft or the rubber boot. I’ve learned the value of anti-sieze lubricant on my outboard. When I put the new arm on I’ll add a little to bake the next one easier to get off.

I was going to ask if the barrel of the nut should have vertical serrations to match the stud. Thanks for the preemptive answer. So, the threaded flange nut has to be torqued down pretty tight to get the grooves to bite into the wiper nut, right?
Before attaching the arm, to position it correctly I’m thinking, start the wiper motor and shut it off to make sure it returns to the home position, then just put the arm on so it’s in the retaining clip.

Is this adjustment screw to fine tune the wiper coverage?

 

[jp.vegas]

That doesn’t sound correct. Looking at a new OEM Toyota wiper arm for a 2014 SR5 4Runner (left photo), you can see that nut is part of the arm. The teeth are fully embedded in the plastic, so they couldn’t engage anything. It slides onto the stud and the arm is secured with the flanged nut. The arm wouldn’t fit on the stud if that nut is left on.
The right photo shows the aftermarket arm I bought that fits my vehicle. The metal insert doesn’t have the large teeth but instead has many more smaller teeth.

Fair enough, non-intuitive but I stand corrected.