kurisu
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Leaf Number: 406031

2013 Front window regulator motor mount welds broke

Thu Feb 21, 2019 8:55 pm

My 2013 SV front driver side window regulator started making horrible grinding noises a couple of weeks ago. I was pretty sure the regulator was bad, so I ordered a new one. I finally tore into the door today and found that the welds holding the motor assembly completely broke! The assembly was secured to the door by one bolt. That caused the cable to get all kinked up in the pulley.

Image
Broken regulator on bottom.
Last edited by kurisu on Sun Feb 24, 2019 5:46 pm, edited 1 time in total.

LeftieBiker
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Re: 2013 Front window regulator motor mount welds broke

Thu Feb 21, 2019 10:34 pm

Not a good location for just four small spot welds!
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kurisu
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Re: 2013 Front window regulator motor mount welds broke

Fri Feb 22, 2019 3:29 am

Exactly right! I'm actually surprised I haven't seen any other reports of this failure on this forum or elsewhere.

LeftieBiker
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Re: 2013 Front window regulator motor mount welds broke

Fri Feb 22, 2019 3:58 am

Those who have the door panel open anyway may want to explore reinforcing those brackets, either with small ss screws or an epoxied-on center brace for each one.
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alozzy
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Re: 2013 Front window regulator motor mount welds broke

Fri Feb 22, 2019 11:34 pm

Pop rivets would be the easiest thing to reinforce with
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LeftieBiker
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Re: 2013 Front window regulator motor mount welds broke

Fri Feb 22, 2019 11:37 pm

alozzy wrote:Pop rivets would be the easiest thing to reinforce with
Rivets tend to loosen over time in places like that.
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Nubo
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Re: 2013 Front window regulator motor mount welds broke

Sat Feb 23, 2019 5:21 pm

kurisu wrote:Exactly right! I'm actually surprised I haven't seen any other reports of this failure on this forum or elsewhere.
Understandable, but it's probably a good indication that the design is "good enough". There are thousands of such design decisions that go into a car. If they chose to over-build in each case, the car would probably weigh and cost double what it does. ;)
I noticed you're still working with polymers.

kurisu
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Re: 2013 Front window regulator motor mount welds broke

Sat Feb 23, 2019 6:51 pm

That's the assumption we'd like to be able to make, but we know enough about design and production failures that prove real-world application sometimes challenges that assumption (Takata airbags ring a bell?).

It could also be my location. I haven't taken my car to the dealer for this kind of repair, but maybe the service department would have reported a higher than normal number of regulator failures. Hawaii air isn't kind to cars and other metal things.

kurisu
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Joined: Mon Feb 17, 2014 3:17 pm
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Re: 2013 Front window regulator motor mount welds broke

Sun Feb 24, 2019 5:25 pm

I compared the Leaf regulator to other older Nissans. Many of them had the more common motor assembly that was detached from the regulator track, and that assembly was secured to the door by 3 or 4 bolts. It looks like the 2013 Sentra switched to the design shared by the Leaf, with the motor assembly welded to the track, and secured to the door by one bolt.

Thinking back, I recall that the window in question always had a lot of lateral movement as the glass moved into and out of the fully closed position (more than the other windows, and definitely once I put in the new regulator). And I recall that right before the grinding noises started, there was a very loud, solitary metal snapping and ringing sound. Putting these two things together, it seems possible that for as long as I've owned the car (I'm the original owner), most of the welds were already failed, and the motor assembly was secured by perhaps even just one weld (and bolt) and had a lot of play. Finally that one weld snapped.

Having the motor assembly fixed to the track definitely makes it a little less messy to take out and reinstall, but it was probably a poor decision to have only one bolt securing it to the door. All of the welds on that regulator look like they're in horrible shape. It was just a matter of time before the whole thing fell apart.

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Nubo
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Re: 2013 Front window regulator motor mount welds broke

Sun Feb 24, 2019 10:34 pm

kurisu wrote:...It could also be my location. I haven't taken my car to the dealer for this kind of repair, but maybe the service department would have reported a higher than normal number of regulator failures. Hawaii air isn't kind to cars and other metal things.
That could certainly play into it. Anything that gets into the works and makes the window motor work harder is going to put more stress on the components. I know I've seen a post recently about cleaning and lubricating the window tracks to allow freer movement. Might be something to look into if salt and/or sand is an issue there.
I noticed you're still working with polymers.

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