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Old 03-23-2020, 07:44 PM   #21
hholbein
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Default Re: Rear suspension bolts

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Originally Posted by 454cid View Post
Those don't look that bad to me. Do you have a bench grinder that you can mount a wire wheel? I think those may clean up pretty well.

Warning: if you're not used to using a wire wheel, definitely wear safety glass.... they will throw wires. Even the industrial grade wheels will throw wires.
I've also seen worse, and attacking it with a MAPP or Propane torch and some thermal shocking could well work on these.

If you want to see some fun wrenching on crusty cars, I highly recommend the South Main Auto Channel from upstate NY.

https://www.youtube.com/watch?v=-xeWj5XQLu8
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Old 03-23-2020, 07:55 PM   #22
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Default Re: Rear suspension bolts

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Originally Posted by fdryer View Post
Hydrogen embrittlement was discovered when large construction projects revealed weakened structures in steel used in supports for buildings exposed to the atmosphere like external steel in buildings and bridges. With virtually every bridge requiring rust preventative treatments, painting exposed steel lessens and reduces corrosion and structural weakening from this little known hydrogen embrittlement process occurring naturally. A documentary on tv revealed this phenomenon affecting one building with external steel going untreated. When periodic testing was performed, it was discovered serious weaknesses occurred with bolts used to hold steel together. Mechanical engineers studied it and came up with replacement as a near term solution (costing millions) and coating to reduce infiltration frome exposure.

A search of plating processes seems to explain cleaning preparations may induce embrittlement in certain plating procedures as well as after plating. I think mechanical engineering has this covered long before consumers buying replacement nuts and bolts have any concerns about degraded hardware used in suspensions.
I'm talking about electrolysis used to remove rust, not from being exposed to the elements during use in the suspension.
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Old 03-23-2020, 07:59 PM   #23
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Default Re: Rear suspension bolts

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Originally Posted by hholbein View Post
I've also seen worse, and attacking it with a MAPP or Propane torch and some thermal shocking could well work on these.

If you want to see some fun wrenching on crusty cars, I highly recommend the South Main Auto Channel from upstate NY.

https://www.youtube.com/watch?v=-xeWj5XQLu8
Eric O. is one of the best.
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Old 03-23-2020, 08:18 PM   #24
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Default Re: Rear suspension bolts

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Originally Posted by 454cid View Post
I'm talking about electrolysis used to remove rust, not from being exposed to the elements during use in the suspension.
Ok then but aren't you putting the cart before the horse? The snapshot of a thoroughly rusted suspension nut and bolt is already in need of removal and replacement. I'm not sure electrical processes to remove rust is in mind for this repair to reuse these nuts and bolts.
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Old 03-23-2020, 09:39 PM   #25
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Default Re: Rear suspension bolts

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Originally Posted by fdryer View Post
Ok then but aren't you putting the cart before the horse? The snapshot of a thoroughly rusted suspension nut and bolt is already in need of removal and replacement. I'm not sure electrical processes to remove rust is in mind for this repair to reuse these nuts and bolts.
I suggested a wire wheel to clean the hardware up, the OP said he was thinking electrolysis.

Edit: Upon re-examination of his picture, I think the nut is a little rough, but I think the bolt should be fine, which would be the harder of the two to match.
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Old 04-21-2020, 10:42 PM   #26
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Default Re: Rear suspension bolts

Hello, guys.
I was able to undo some of those screws. I have replaced the struts and the rubber parts on the trailing arms. So far much happy with the result!
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Old 04-22-2020, 12:57 AM   #27
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Default Re: Rear suspension bolts

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Originally Posted by Hiisi View Post
Hello, guys.
I was able to undo some of those screws. I have replaced the struts and the rubber parts on the trailing arms. So far much happy with the result!
I didn't know urethane was available for our cars.

You don't need to use that much anti-seize on the bolts. As you likely discovered the extra just gets pushed off by the nut and ends up on something you touch, and then spreads to everything you don't want it on even though you keep wiping your hands off. I usually apply it with an acid brush.
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Old 04-22-2020, 09:01 AM   #28
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Default Re: Rear suspension bolts

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Originally Posted by 454cid View Post
I didn't know urethane was available for our cars.

You don't need to use that much anti-seize on the bolts. As you likely discovered the extra just gets pushed off by the nut and ends up on something you touch, and then spreads to everything you don't want it on even though you keep wiping your hands off. I usually apply it with an acid brush.
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They also have them in black color, but the red is more sporty
I was also very generously applying the grease that comes with the silent blocks. That stuff is sticky
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Old 04-22-2020, 11:29 AM   #29
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Default Re: Rear suspension bolts

Since a visit to the local wrecking yard has been mentioned,
let me point out that GM didn't redesign every bolt and nut
for each application.

It's very possible that you can scout the wrecking yard for
exact or nearly exact replacements from another GM brand
car. And you can check many much newer cars for the part.

Stay with the smaller cars, because larger cars likely have
larger hardware. But I'm betting a Chevy Cruze or one of
it's GM cousins might be a valid donor for your hardware.

Working at Firestone, I've changed hundreds of struts. And
every tech has a 5-gallon bucket of loose bolts and nuts.
I never had a problem finding replacements for damaged
nuts and bolts while searching the stashes of all our techs.
Believe it or not, the hardest part of the job was putting the
the hardware back in the buckets after dumping it out to
search through it.

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