[DeTomaso] Techno question: Koni shock bump stops

[Charles Engles]

Dear Doug,

                Egad.  I will have to send out a search party to delve into the two inch thick file folder (mostly chronologically filed) to see if I can find the records from when I bought them from Pantera Performance many years ago.  I will also see if I can find something on the Koni website to double check about the lifetime guarantee for the original purchaser.  Thanks for the info.

                           Warmest regards, Chuck Engles



-----Original Message-----
From: Doug Braun [mailto:doug351c at gmail.com] 
Sent: Saturday, June 26, 2021 5:01 PM
To: 'Frank Lisi'; 'Charles Engles'; detomaso at server.detomasolist.com
Subject: RE: [DeTomaso] Techno question: Koni shock bump stops

Chuck and Frank,

AFIK, KONI shocks are lifetime guaranteed for the original purchaser.  If you're fortunate enough to have kept your receipt, you can send the shock(s) to them and they'll not only replace the bump stop but also rebuild the shock to "like new".  I had that done to one of mine that had failed but it was 15, or so, years ago.

Doug Braun 
Blue 73L #5505 

-----Original Message-----
From: DeTomaso On Behalf Of Frank Lisi
Sent: Saturday, June 26, 2021 11:15 AM
To: Charles Engles <cengles at cox.net>; detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Techno question: Koni shock bump stops

Hi Chuck,

What a coincidence, I just started attempting to resolve my Konis'  deteriorated crumbling bump stops.  I found the replacement part on Amazon, (of all places) sold by a third party seller called Performance Guarantee (I believe they only sell through Amazon I could not find their direct web site)

The part number is Koni 71 34 42 000 0, two bump stops for $25.63. That said I am not sure this is the exact replacement part as my existing stops are deteriorated and any number indications are long gone.  Once I receive the parts I will let you know.  

BTW the thought of needing to disassemble and reassemble all four shocks does not excite me.  I am willing to send them to a service to have the replacements installed, however I have not begun that search.   

The Koni web site is https://www.koni-na.com/en-US/NorthAmerica/Products/Accessories/BumpRubbers/

Let me know what you find.

All the Best

Frank Lisi



On 6/25/21, 12:48 PM, "Charles Engles" <cengles at cox.net> wrote:

       Dear Forum,


                 During a long sporty drive this week there was a new
       squeaky/squealy noise from the right corner only during  left turns at
       more than 35 mph or so.  I thought that the high positive caster had
       resulted in the tire contacting the fender lip.  I had solved that
       problem over twenty years ago and I did not understand why it would
       return.


                  Inspection showed no obvious fender contact on the tire nor
       of tire contact on the fender.  I removed the wheels and did not see
       evidence for a leaky, failing Koni shock.


                  I did find that the bump stops, both right and left, look
       they are well into crumbling deterioration.  I think that the smaller
       effective bump stop permitted more suspension travel which did allow
       some tire-fender lip contact for brief periods.


                 It obviously happens, but I have not heard of failing bump
       stops.  I presume that this mundane failing part will require shock
       removal to replace the bump stop?    Has anyone else been down this
       proverbial road?


                                Warmest regards, Chuck Engles


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