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Old 03-06-2019, 12:06 AM   #1
TwoFistedJustic
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Default Is it necessary to replace nuts when doing suspension work?

I'm preparing to replace all the rubber bushings in my gen3 SC2 suspension. The OEM shop manual says that some of the nuts, once removed, must be replaced with new ones.

Is it really necessary?

And where would I get them? Can I just use grade 10.9 from the hardware store?

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Old 03-06-2019, 02:49 AM   #2
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Default Re: Is it necessary to replace nuts when doing suspension work?

Quote:
Originally Posted by TwoFistedJustic View Post
I'm preparing to replace all the rubber bushings in my gen3 SC2 suspension. The OEM shop manual says that some of the nuts, once removed, must be replaced with new ones.

Is it really necessary?

And where would I get them? Can I just use grade 10.9 from the hardware store?
I never bothered and never had issues. YMMV.

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Old 03-06-2019, 07:16 AM   #3
youstolemybeer
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Default Re: Is it necessary to replace nuts when doing suspension work?

if they are Nylocks then its not a bad idea, as for just regular nuts, nope. never had one come loose after suspension work

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Old 03-06-2019, 10:06 AM   #4
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Default Re: Is it necessary to replace nuts when doing suspension work?

Quote:
Originally Posted by TwoFistedJustic View Post
I'm preparing to replace all the rubber bushings in my gen3 SC2 suspension. The OEM shop manual says that some of the nuts, once removed, must be replaced with new ones.

Is it really necessary?

And where would I get them? Can I just use grade 10.9 from the hardware store?
You do not have to worry about rust. Replace the ones you perceive as critical.
As far as following the shop manual, there is anti-seize on every bolt on my car that is not inside the engine or transmission. I use jamb nuts on a few critical suspension parts. If there is no cotter pin, I re-check torque when Im under there to be sure nothing moved. It never does.

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Old 03-06-2019, 01:57 PM   #5
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Default Re: Is it necessary to replace nuts when doing suspension work?

Quote:
Originally Posted by bumpdraft View Post
You do not have to worry about rust. Replace the ones you perceive as critical.
As far as following the shop manual, there is anti-seize on every bolt on my car that is not inside the engine or transmission. I use jamb nuts on a few critical suspension parts. If there is no cotter pin, I re-check torque when Im under there to be sure nothing moved. It never does.
Caterpillar conducted extensive testing in regard to the cotter pins in the rod and main bearing cap nuts. The results were they were completely useless so they were eliminated.This was done in the late 40s-early 50s.

Any prevailing torque nut is a 1 time use nut. The nyloc is usually considered single use but in most cases a re-use is OK. The FSM will identify the specific single use fasteners in the specific repair-replace section.

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Old 03-07-2019, 07:16 PM   #6
TwoFistedJustic
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Default Re: Is it necessary to replace nuts when doing suspension work?

Quote:
Originally Posted by OldNuc View Post
The FSM will identify the specific single use fasteners in the specific repair-replace section.
In the event that I do need to replace a prevailing torque nut, do you have a good supply source? My FLAPS doesn't carry them.

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Old 03-07-2019, 07:44 PM   #7
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Default Re: Is it necessary to replace nuts when doing suspension work?

You usually can find special nuts like axle nuts at the FLAPS and the generic ones from McMater-Carr industrial supply. OR you can recycle the old nut after careful cleaning of the nut and bolt/shaft and using Loctite 272.

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