Peter F

Took my rear wing off to fix wiper and of course three of the four mounting bolts came loose
Have been searching the archives on how to fix this and got some good word of advice from Andrew.
This is my plan which combines some different solutions.
I hope this will be strong enough to keep the wing on the car also in high speed
I found M6 bolts which will screw into the foam in the wing.
(combined M6 and self tapping threads)
Will be using the old plastic bushings to get them centered properly.
Then remove the bushings and glue the bolts with epoxi or similar.
Once cured for a couple of days clean the surface from paint with the dremel and make sure the surface is flat and nice.
Then attach an aluminum plate like described in another thread with both glue and self tapping screws.
Perhaps cover the aluminum with a thin rubber layer which will protect against the hatch?
The screws are long enough to give some extra thread to compensate for the aluminum thickness which is a big plus.
Heres a couple of pics of the bolts I will use and how they will be mounted.




Any tips on the subject are well received

Thanks/Peter

ROG100

Peter,
I did not put new bolts in just used the aluminium cover - been good for two years now.
Roger

Peter F

Thanks Roger,

i found your drawing for the aluminum plates for the base on another thread.
I hope this combination of things will make a strong repair.
(as long as no one uses the wing as a handle:-)

Cheers/Peter

Garth S

I would suggest making two jigs out of ~2cm thick wood , each with two 6mm holes exactly spaced and perpendicular to the holes in the hatch. Clamp or tape these jigs over the M6 studs before the epoxy cures in the wing.... and use a wax paper seperator under the jig, or it will be there for a while. It is a small precaution to assure a 'factory fit' ....

Peter F

Thanks Garth,

that is a good idea ,with some light pressure when curing it will also help shape the base of the wing flat.(less dremel grinding needed)
Still thinking each step trough before finalising the repair.
What do you think about using both glue and self tapping screws to secure the aluminum sheet to the wing?
As long as that aluminum sits firm to the wing the M6 threads will not come out.

/Peter

Garth S

Thinking of an aluninium base plate, I'd probably cut it to shape from ~2mm stock. This would give adequate thickness to chamfer/bevel the screw holes and allow use of flat head screws. The end result would be an absolutely smooth surface to contact the hatch area. A thin rubber gasket is a good idea; however, when I mounted a S4 wing on my '80, I used a thin bead of the non-hardening strip sealant used on windshields - good to have a water tight seal at least for the holes in the hatch.

Peter F

Ok,

new M6 bolts have been screwed into the foam, base have been cleaned up with the Dremel tool.(half of bolt is selftapping and other half has M6 thread)

Time for the wooden block suggested by Garth with drilled holes to secure correct distance between bolts.

Trying the alignment of the bolts, perfect it turned out :-)
And here is the hole filled with super glue

Finally back with the wooden block and wax paper so it doesn get stuck permanently, and some pressure added to level the surface.

Now it will be left alone for a couple of days to cure properly.
Meanwhile I will cut the aluminum plates for the base and think about what glue to use to attache it to the base.
It feels very strong already, hope it will not break due to being to hard and solid.

Cheers/Peter

Peter F

So finally after all holidays the wing is now done.
The good thing with the slow process is that the glues have had time to really cure properly between each steps.
Here's a couple of more pics of the final steps.
Thanks to everyone chiming in with ideas and advice

Here the aluminum plates(2mm thick) have been glued to the wing,
Then mounted it on the car and snugged it down to ensure it shaped after the hatch properly.(used Polyurethan glue for marine usage for this)

Once cured for a couple of days on the car it was time for the self tapping screws.(used four on each plate)

Final touch will be to glue a 2mm neopren rubber on top of the aluminum.
This will ensure no water can get into the wing trough the screws.


I expect the wing to stay on the car safely now but time will show

Cheers/Peter

Imo000

Looks good!

Mrmerlin

Hi , just a suggestion , the metal plates that you have made will lift the wing slightly further from the hatch, I would get some 3M clear film and cover the metal plate (you made)and the surface of the hatch on the outside , with the same stuff, nice work on your potting party, Stan

whitefox

Great work.

I can just imagine that wing flying off on the highway and the look on your face when you look in the mirror though.

jetrainor

Is this problem typical on removal of the s4 wing?

87 euro auto

Peter F

Just wanted to report the current result of my little repair project of the wing from early this Year.

It is still there on the back

It seems to be just perfect after the first season of driving

Cheers/Peter

dph928

I repaired my rear wing today, just one had snapped. I took a different approach from above which seems pretty solid and much simpler.

1) Remove plastic washer
2) Tighten down a nut until the remaining threaded bolt snapped flush with metal plate (embedded in the wing)
3) Drilled a 5mm hole through the centre of the bolt, starting with a 2mm drill bit (set drill to a depth of 4cm so as not to accidentally drill through wing).
4) Tapped an m6 thread into the hole.
5) Checked the thread, which gave a 3-4mm threaded area to bolt into.
6) Refitted, with a small amount of silcon to ensure the new thread doesn't rust and threadlock on the stainless bolt I used to attach.
Hope this helps.
Cheers.

Rob Edwards

My turn-

Any great advances in rear wing stud repair? I like the solution posted here, and in this thread: https://rennlist.com/forums/928-foru...ng-repair.html