Undertray stud replacements

[chaz1]

Car 987 Boxster/Cayman 2007 3.4

A couple of the studs for the under trays snapped off when undoing the plastic nuts despite the treads being cleaned with a brush and sprayed with penetrating oil.

Is there a way of replacing the studs from underneath some sort of rivet bolt?

Or anyone tried click bond ?

http://www.planet-9.com/r...ond-cs125-1024-cr.html

When the car is at high speed the under trays bang so needs fixing.

thanks for any info

 

[JohnCRS]

Chaz, my main undertrays are held on with screw fixings, same as the wing liners, and plastic bolts on to metal threaded studs. I assume you are referring to the latter items but you have metal bolts?

 

[chaz1]

John

yes stud is a better description.

It looks like this stud is in fact part of the body shell and cannot be replaced easily, but I may be wrong.

What I can't understand is why they snap when I applied plus gas and cleaned the thread before undoing them after the first one snapped?

I there some sort of nack to undoing them?

 

[JohnCRS]

Chaz. They are basically a piece of thread welded to the body shell. Mine have always come off easily without requiring lubrication etc. and it is hard for me to imagine how you get sufficient pressure to snap them. Can you identify which particular ones have broken so I can see where they are located.

You may be able to insert a rivnut if it is going into sheet metal, and then you can use a suitable bolt from the outside. Otherwise welding a new bolt in place of the broken stud is the logical solution. An alternative would be to grind the old stud away and use a two pack epoxy to bond a bolt head to the metal floor in place of the original stud. That is the easiest DIY solution, but may not be as permanent as a weld.

 

[chrishak]

I spent some time looking at the underbody of my 986 with our local indy, Tim O'Dowd at Marque 21. He was very careful when removing the plastic nuts, spraying them with WD40 first then slowly undoing them. The reason for the extreme caution? Because they can and do snap and are a bugger to replace afterwards...

 

[chaz1]

Thanks for the info.

Looking at one of the broken studs it was quite badly rusted may be as much as 30%.

I will let you know the position of the studs that snapped once I have removed all the undertrays.

I then will know how many I need to replace. I am letting them soak in plus gas before I go near them with a spanner again. The click bond is the way I am probably going to go.

I am just going back on shift so won't be able to do much for 7 days or so.