Engine undertray from hell (the 10mm nuts in the wheelarches are stuck!) 1.4i

SpdyHS

New Member
As my thread title says, I'm in trouble! (petrol 1.4)

When I bought the car I did not check for the undertray, the car turned out not to have one. I have now bought one used, as well as a set of "undertray nuts and washers" from ebay (they seem to be correct).

However, the old 10mm nuts in the wheelarches are still attached to the car, but they are stuck. I can turn them but I can't get them released. Therefor I can't fit my undertray 😓

Any ideas?
 

Edwrai

Member
As my thread title says, I'm in trouble! (petrol 1.4)

When I bought the car I did not check for the undertray, the car turned out not to have one. I have now bought one used, as well as a set of "undertray nuts and washers" from ebay (they seem to be correct).

However, the old 10mm nuts in the wheelarches are still attached to the car, but they are stuck. I can turn them but I can't get them released. Therefor I can't fit my undertray

Any ideas?
Drill bit the heads off or get something behind it to hold the clip if possible


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Naedugs

Member
Try soaking them with penetrating fluid for a day or two then clean the threads on the bolts fixed to the body then using a 6 sided socket carefully move the nut back and forward to loosen it then undo in the normal way, or try heat in you can..
 
.......
However, the old 10mm nuts in the wheelarches are still attached to the car, but they are stuck. I can turn them but I can't get them released. Therefor I can't fit my undertray 😓

Any ideas?
Hi,

Take care here.
The thread is not a bolt - it is just a threaded section that is press-fitted and glued to the structure.
If you "break" the fixing of the thread it will just end up spinning and eventually come loose and fall inside the chassis.
If the nuts will not come loose, the best plan would be to remove the threaded section by whatever means you feel appropriate, buy some aluminium rivnuts and fit those in the chassis and then use some appropriate bolts to thread into the rivnut.

If you do manage to loosen the nuts, clean the threads of the both nut and thread and use some greaseto coat them to stop future corrosion.
Remember, if you pressure wash your car and clean the wheel arches you will remove the grease, so just blob a little back on the thread and you'll not have this issue the next time.

Hope this helps
Cheers
Jeff
 

nod

Member
Nut splitter might do the job? It's pretty easy to damage the stud if you go for forcing the nut, I did on my breaker fsi recently. For speed....
 
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