Bilstein front shock bar pin sheared off, bent shaft - Chevy Impala SS Forum
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post #1 of 32 (permalink) Old 06-20-2016, 07:08 PM Thread Starter
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Bilstein front shock bar pin sheared off, bent shaft

Has this happened to anyone else? I had a front Bilstein shock (24-011044) lower mounting bar pin shear off on one side. I did not notice this and apparently drove long enough with only one side connected which lead to fatiguing the single remaining mounting point to the point of failure. The A- arm through-hole failed, allowing the shock to fully extend, and (eventually) contact the ground under suspension compression...

I'll hopefully be replacing the shock under warranty, I was just concerned that this might repeat itself, if it's a common occurrence?

Also, does anyone have any suggestions for repairing the damage to the A-arm, short of replacement? I'm thinking I might weld a reinforcement panel (with captive nut?) where the torn mount hole remains.
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1996 Impala SS
1996 Caprice sold

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post #2 of 32 (permalink) Old 06-20-2016, 07:35 PM
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I'm not sure if that sheered off or the captive nut gave way on that side. It probably sheered off when it hit the ground.


I've been changing front springs on mine and notice that the captive nuts are pretty week after being taken on and off a couple times.


They should be replaced with bolts and lock washers or lock nuts.
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post #3 of 32 (permalink) Old 06-20-2016, 08:17 PM
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That shock is toast, hopefully they give you a replacement under warranty. Can't say for sure on the A-arm since there is no picture but think it's time for a new arm based on your description of the damage.

Not sure you really have any options other than the stock Speed/Spring Nuts used to slide into the a-arm. I just don't think you have access to hold a nut on the opposite side that the bolt goes thru. Maybe tack weld them in if your against the stock style nuts. On all the cars I've had with this type of suspension, never have seen a shock shear off like that from the bolt backing out. I suspect something hit it and ripped it off.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #4 of 32 (permalink) Old 06-20-2016, 08:53 PM Thread Starter
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Quote:
Originally Posted by Jesse Walter View Post
I'm not sure if that sheered off or the captive nut gave way on that side. It probably sheered off when it hit the ground.
I should have mentioned that the sheared off side was still attached to the A-arm, nice and snug, but perfectly sheared off...

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Originally Posted by Jesse Walter View Post
They should be replaced with bolts and lock washers or lock nuts.
I will definitely be doing this, on both sides, while I'm sorting out this broken shock. Still won't help if the pin decides to give up though... 👎

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That shock is toast, hopefully they give you a replacement under warranty.
I contacted Summit, they're sending me a replacement under warranty, though they aren't offering any help regarding the A-arm.

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post #5 of 32 (permalink) Old 06-20-2016, 08:57 PM Thread Starter
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Here's a pic of the damage to the arm, I think it can be repaired with a plate welded in, and a captive nut.
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post #6 of 32 (permalink) Old 06-20-2016, 09:09 PM
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One of the ak1195? (the crown vic shocks) i had failed maybe like yours. Notice one day that pushing down on the bumper, one side abruptly stopped. Thought it was something else at the time. But later when i undid the bottoms, the suspension moved freely. Taking them out, the bad one works fine to about 1/2 compression, then stops cold like it's hitting something inside. Some hard pot holes would have probably ended up breaking something like your did.

Not to bash them, as this might be the only two instances of it ever happening. One day, with some free time, plan to open up that shock and see what's going on. Nothing I can see in internal view pictures that could cause it.
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post #7 of 32 (permalink) Old 06-20-2016, 09:15 PM Thread Starter
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Quote:
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Not to bash them, as this might be the only two instances of it ever happening. One day, with some free time, plan to open up that shock and see what's going on. Nothing I can see in internal view pictures that could cause it.
Unfortunately, they've asked that I send the damaged unit in exchange as part of the warranty. Good thought though, I suspect an internal failure could have caused enough force on the pin to shear it.

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post #8 of 32 (permalink) Old 06-20-2016, 09:30 PM
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be nice if they could follow up. did you send it already? Going directly to bilstein might have gotten us more information. But probably take longer to get a replacement.
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post #9 of 32 (permalink) Old 06-20-2016, 09:32 PM Thread Starter
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be nice if they could follow up. did you send it already? Going directly to bilstein might have gotten us more information. But probably take longer to get a replacement.
No, I haven't sent it yet. They've asked I send it in the 'return' for the replacement they're sending me, so it'll be a few days.

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post #10 of 32 (permalink) Old 06-20-2016, 09:44 PM
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Yeah, the AK shock is the non warranty version hence me pulling it apart for curiosity. But they are quite a bit cheaper too. Trade offs..
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