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Coupe front damper extra support 
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Part built GTM
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Joined: Wed Feb 13, 2008 9:58 pm
Posts: 76
Location: Holmfirth, West Yorkshire
Post Coupe front damper extra support
Hi
My Coupe is 1989 and I have on more than one occasion had to repair the front damper location arm assembly due to the plate sandwiched between the subframe and the body fracturing by bending fatigue accross the holes. See sketch 014
Attachment:
GTM Oct 2011 014 copy.jpg
GTM Oct 2011 014 copy.jpg [ 36.63 KiB | Viewed 3833 times ]

The cure to avoid this or any future fractures is to add a support leg to stop the damper location arm flexing under load particularly with increased loads from stiffer competition damper units. See Photos
Attachment:
GTM Damper leg support Oct 2011 006 copy.jpg
GTM Damper leg support Oct 2011 006 copy.jpg [ 63.45 KiB | Viewed 3833 times ]

Attachment:
Damper pin support 005 copy.jpg
Damper pin support 005 copy.jpg [ 33 KiB | Viewed 3833 times ]

The top location needs a little more work since an hexagonal long nut has to be used to extend the threaded pin for the securing nut. The new arm should be secured to the extended top arm with a setscrew of an appropriate length. See Photo 005
You will notice that the extension spacer long nut allows the support arm to clear the diameter of the damper upper body and since it will be secured with a setscrew into the long hexigon nut, it allows more accurate marking out of the upper hole position prior to drilling.
Also note the use of sufficiently large tank washers either side of the damper bush to keep it in place.
I hope this helps and please take care because if you have a coupe and have not done this modification then you are very likely to suffer this type of failure at some stage.
[attachment=0]Damper pin support 005 copy.jpg


Attachments:
Damper pin support   011 copy.jpg
Damper pin support 011 copy.jpg [ 52.5 KiB | Viewed 3833 times ]
Damper pin support 008 copy.jpg
Damper pin support 008 copy.jpg [ 49.42 KiB | Viewed 3833 times ]
Mon Oct 31, 2011 5:40 pm
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Part built GTM
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Joined: Wed Feb 13, 2008 9:58 pm
Posts: 76
Location: Holmfirth, West Yorkshire
Post Re: Coupe front damper extra support
Hi again
I messed up this article a bit and some of it is missing. Here is the missing bit. The extra suppost arms are made from suitable steel tubing flattened at the ends in a vice. Only flatten one end first and be sure of the total length before flattening and dealing with the other end. Attach the lower end to the front suspension lower fulcrum pin shown in photo before flattening and marking out the top end. The upper damper location pin needs to be extended first using a longer nut.

That should do it. Please ask if anything needs clarification.


Mon Oct 31, 2011 5:57 pm
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