Recall bulletin SB-25-90-001 Off Road Lightbar new version with bracket

[Tallgeese179]

That’s great. Can you tell us more about the tape you used? Size, thickness. How you applied it?
Thanks

Sorry for the misunderstanding, I don't own and have never installed a CT lightbar. My experience comes from working at a robotaxi company and learning how to effectively use VHB to mount sensors to the interiors of windshields.

From this I found AP115, Primer 94, etc. My challenge was different though, since I was mounting things that would be free hanging (constant gravitational load). Though 3M does specify a load per area spec, it's different depending on shear, axial, or free hanging load. Free hanging requiring the most tape, of course. Air pockets are a common issue with monolithic pads, along with the PSI requirements when you're pushing out from the inside of the windshield (seems like 15 psi is a good spot to aim for). For the light bar, the primary load will be headwind blowing across the front face applying a shear load and a peeling load across the leading edge specifically.

Our solution was ultimately to use silicone heating pads on the opposite side of the windshield to control installation temp and speed up full strength cure from 72 hrs at room temp up to ~2 hours. This could probably be done on the truck by running defrost inside (or a little space heater with a thermostat) and running the light bar (I'm sure those things have to get hot if the run for a few hours). Load would ideally be applied evenly by making a contoured basket that lays across the top and can be loaded up evenly with sandbags. Again at 15 psi, this thing might get heavy real quick.

This is an example spec sheet that I'm referring to:

https://multimedia.3m.com/mws/media....pdf?&fn=3M-VHB-Tape-Specialty-Tape-4930F.pdf

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[hemiarch]

Sorry for the misunderstanding, I don't own and have never installed a CT lightbar. My experience comes from working at a robotaxi company and learning how to effectively use VHB to mount sensors to the interiors of windshields.

From this I found AP115, Primer 94, etc. My challenge was different though, since I was mounting things that would be free hanging (constant gravitational load). Though 3M does specify a load per area spec, it's different depending on shear, axial, or free hanging load. Free hanging requiring the most tape, of course. Air pockets are a common issue with monolithic pads, along with the PSI requirements when you're pushing out from the inside of the windshield (seems like 15 psi is a good spot to aim for). For the light bar, the primary load will be headwind blowing across the front face applying a shear load and a peeling load across the leading edge specifically.

Our solution was ultimately to use silicone heating pads on the opposite side of the windshield to control installation temp and speed up full strength cure from 72 hrs at room temp up to ~2 hours. This could probably be done on the truck by running defrost inside (or a little space heater with a thermostat) and running the light bar (I'm sure those things have to get hot if the run for a few hours). Load would ideally be applied evenly by making a contoured basket that lays across the top and can be loaded up evenly with sandbags. Again at 15 psi, this thing might get heavy real quick.

This is an example spec sheet that I'm referring to:

https://multimedia.3m.com/mws/media....pdf?&fn=3M-VHB-Tape-Specialty-Tape-4930F.pdf

I installed mine in the Arizona summer so functionally the same thing

 

[PungoteagueDave]

This was inevitable after the prototype truck with exoskeleton concept devolved into glued-on stainless body panels because forming stainless turned out to be really hard and the "look" objective had to be met even if done with sticky tape and adhesive.

 

[Cyberskunk]

I really think they should have chemically etched (looks frosted) the glass where the lightbar adhesive is applied, alcohol clean then BETACLEAN™ GC-800

NHTSA Part 573 Safety Recall Report (25V735) findings were techs used the glass pimer on the plastic bar and the plastic primer on the glass. Whoops.

I've used adhesives in aero and with proper surface prep on both sides and the right products you'd be able to rip the whole windsheild out before the bar came off.

 

[bg002h]

I really think they should have chemically etched (looks frosted) the glass where the lightbar adhesive is applied, alcohol clean then BETACLEAN™ GC-800

NHTSA Part 573 Safety Recall Report (25V735) findings were techs used the glass pimer on the plastic bar and the plastic primer on the glass. Whoops.

I've used adhesives in aero and with proper surface prep on both sides and the right products you'd be able to rip the whole windsheild out before the bar came off.

This is a good example of simple things being impossible IRL.

 

[EightBitWhit]

FYI that I was able to pick up my OTC parts order at my local SC yesterday, so I (finally) have the lightbar retrofit parts in hand.

Here's what the whole lot looks like:

2 brackets, 2 Rivnuts, 2 bolts to secure the brackets to the body of the truck (via the Rivnuts) and 4 black screws to secure the light bar to the bracket.

 

[JCERRN]

FYI that I was able to pick up my OTC parts order at my local SC yesterday, so I (finally) have the lightbar retrofit parts in hand.

Here's what the whole lot looks like:

2 brackets, 2 Rivnuts, 2 bolts to secure the brackets to the body of the truck (via the Rivnuts) and 4 black screws to secure the light bar to the bracket.

doesnt include the mounting plates for the light bar ends?

 

[stebb1174]

FYI that I was able to pick up my OTC parts order at my local SC yesterday, so I (finally) have the lightbar retrofit parts in hand.

Here's what the whole lot looks like:

2 brackets, 2 Rivnuts, 2 bolts to secure the brackets to the body of the truck (via the Rivnuts) and 4 black screws to secure the light bar to the bracket.

So you were able to just ask your SC to order the parts?

Please share the process and results after the install.

thank you for sharing

 

[EightBitWhit]

doesnt include the mounting plates for the light bar ends?

It did not - even though the bracket description says "with pad" there was no pad in the bag, so I'm going to have to go back to the SC and see if something changed on the install procedure or if I'm missing parts.

I'll post back when I have an update.

 

[EightBitWhit]

So you were able to just ask your SC to order the parts?

Please share the process and results after the install.

thank you for sharing

Yes - I submitted a service request of type "Other" and put in the part numbers that I wanted to order and they took it from there.

 

[Cyberskunk]

I'm trying to get the bracket kit.

Tesla specs 3M PT1500 1.52 mm (0.060 in) but I am looking at 3M VHB MAX series tape which uses Max Promoter. It has 2x the strength.


https://www.nedc.com/blog-post-3m-v... VHB Tape,and reducing material usage overall.

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