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#1071552 - 08/12/21 06:27 PM Left Front Bumper Shock Collapsed  
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T5montecarlo Offline
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T5montecarlo  Offline
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Lederach, PA
I have had an indent in the lower front cover/air dam on the left side of the car. I just noticed that the left front bumper shock is shorter (compressed) more than the right side, which may be the cause of the indent; the turn signal housing was also broken, hinting on being hit.

Short of installing solid struts in their place, are there any thoughts on where I would find a proper replacement? I have looked and can't see a source. A used one may be a crapshoot regarding its integrity, and there are no 81-88 2-door G-body cars in the yards around here.

#1071566 - 08/13/21 03:50 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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88ssBrent Online content
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A part that I never thought about, all I can find are used ones for sale. I know our cars are not super popular but you would think someone would make them.

#1071567 - 08/13/21 04:13 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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I was surprised I couldn't find any aftermarket bumper shocks, but I did just by 2 NOS from ebay.

#1071587 - 08/14/21 01:19 AM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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#1071589 - 08/14/21 01:46 AM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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Glad you found 2 nos, hope it didn't hurt the wallet too bad but when you need them and not having to deal with aftermarket quality it is worth paying the premium.

#1071590 - 08/14/21 01:49 AM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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They were 55 each with about 20 shipping plus tax, so not as bad as it could have been.

#1071603 - 08/14/21 12:42 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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They were shipped from central PA and will arrive today!

#1071612 - 08/15/21 12:08 AM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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Well, yesterday I received a notice from UPS that the package would arrive today. Tonight I checked the tracking and there is no progress apart from the label being created. frown

#1071679 - 08/18/21 09:07 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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For reference, here is what the front bumper cover looks like with a partially collapsed bumper shock. The left shock is compressed 1.5 inches.

I got the new shock, yesterday, but haven't put it in yet.

[Linked Image]

Last edited by T5montecarlo; 08/18/21 09:08 PM.
#1071683 - 08/18/21 10:16 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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88ssBrent Online content
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Everything look good on the new shocks as far as visual?

Last edited by 88ssBrent; 08/18/21 10:16 PM.
#1071689 - 08/19/21 12:52 AM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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Yes, they look like they were just made yesterday.

#1071726 - 08/21/21 01:19 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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Here is a picture of the NOS bumper shock and a comparison to the collapsed shock.

[Linked Image]

[Linked Image]

#1071738 - 08/21/21 11:06 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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mmc427ss Offline
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Wow, that is a good score!
Over the years the tail of my car and the left front twice have been pushed hard. A 16 year old kid tapped the back end of the car when it had 15K miles on it, amazingly you couldn't tell it was touched. Couple years ago I hit two different dear, both with enough brake smoke they bounced off the front of the car, stood there and looked at me, then ran. The damage was spider cracks pretty much left front lower corner. Have always had the vertical crack on the right front corner. When you put jackstands at the #2 body mount you could watch it open as you let the front end weight onto the stands.
The fix was delrin #1, #2 body bushing, crack doesn't open anymore.

Have looked at the bumper shocks on the 86 often looking for collapsed ones and and all seem good. Now you have me thinking, how much shaft does a new shock show. corny. Next chance you get take a measurement.

Was supposed to go to the Perkasie show tonight, Frank with his pretty blue 06 GTO (and 86SS still not together) is there, but he's Quakertown.
Still have a cherry rearview and odometer screw sitting for you. And a pile of parts you could root through.
Bob

#1071739 - 08/21/21 11:24 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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IIRC, once collapsed, bumper shocks cannot be used again. But with some fabrication, they can be used again by cutting off the mounts and welding a solid piece of round stock in the middle.


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1071744 - 08/22/21 12:41 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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Bob, there is 4 inches of exposed shaft on the new absorber. Thank you for holding those parts for me. I haven't forgotten about them; I am just waiting for the environment to be more inviting.

Rob, the bumper shocks are pressurized, so I would have expected them to rebound if compressed, but I don't want to try compressing one of my new ones to find out. I may drill a hole in the old one to see if it is still pressurized. I considered making the shock solid, but that would increase the likelihood of bending the aluminum bumper behind the cover.

#1071746 - 08/22/21 01:45 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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I didnt realize they were pressurized, I thought the collapsible mechanism was mechanical like a pressfit gap between two sections of round stock of slightly different diameter. The "'shock" cannot be forced to move until the energy of a 5mph impact moves it.


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1071747 - 08/22/21 01:50 PM Re: Left Front Bumper Shock Collapsed [Re: T5montecarlo]  
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T5montecarlo Offline
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I remember reading something in the shop manual about drilling a small hole to depressurize, to release the gas and oil (like a suspension gas shock), but I don't remember why. I need to read up on that section, again.

#1071801 - 08/25/21 12:49 PM Re: Left Front Bumper Shock Collapsed [Re: mmc427ss]  
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T5montecarlo Offline
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Originally Posted by mmc427ss
Have looked at the bumper shocks on the 86 often looking for collapsed ones and and all seem good. Now you have me thinking, how much shaft does a new shock show. corny. Next chance you get take a measurement.


Here are pictures showing the length of the shock tube and the flange-to-flange outside measurement.

[Linked Image]

[Linked Image]


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