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Undertray issues #1633301
12/06/2019 09:28
12/06/2019 09:28
Joined: Dec 2005
Posts: 882
Banbury
djmobi Offline OP
Enjoying the ride
djmobi  Offline OP
Enjoying the ride

Joined: Dec 2005
Posts: 882
Banbury
Hey everyone. We had some mental rain a few days ago and on the way home from work at 2am I was driving along a country road and despite just fitting brand new HID 5500k's which are amazing, i didn't see a load of flooding till too late and I hit it at about 40.

Now my undertray is hanging down and rubbing. It looks like it's torn out the clips and not damaged the undertray itself but I could do with a bit of advice on what to do.

I will obviously try and find some clips and order them, so if anyone has any advice on where to find them that would be cool, but I could also do with some advice on what I could use to secure it in the meantime.

I haven't had a chance to properly get under it yet so I thought I would ask to see if anyone has any top tips first.

Back at work tomorrow so I've got to sort it today


Back Owning a Coupe
Re: Undertray issues [Re: djmobi] #1633306
12/06/2019 12:39
12/06/2019 12:39
Joined: Dec 2005
Posts: 7,212
Lightwater, Surrey, UK
DaveG Offline
Club Member 311
DaveG  Offline
Club Member 311
Forum is my life

Joined: Dec 2005
Posts: 7,212
Lightwater, Surrey, UK
There's a load of screws at the front that screw into the bottom edge of the bumper, but they usually go rusty and break off / round off. There's a 13mm bolt at each side just ahead of the wheel that bolts into the bottom of the "eiffel tower" brackets which are close to the oil cooler (o/s) and intercooler (n/s) but often the bottom of the eiffel towers rust away too. There's a 10mm bolt that bolts into a short bracket coming from the radiator bottom support bracket (towards the n/s), and finally two more 13mm bolts (IIRC) at the rear that bolt into the subframe, either side of the sump, usually with big washers. But as well as the mounting points at the front/side rusting away, the rear points can become loose when the holes in the undertray grow bigger from wear, or the undertray starts to split/break at those points, meaning that any or all of the mounting points become fairly useless so that cable ties are commonly used to secure the undertray.

So in short, the answer is cable ties (or just remove the undertray for now, but that might take longer if you have to drill out any of the front screws)

Last edited by DaveG; 12/06/2019 12:41. Reason: fixed typos

1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Undertray issues [Re: djmobi] #1633307
12/06/2019 12:40
12/06/2019 12:40
Joined: Dec 2005
Posts: 1,600
Brisbane, Australia
Possum Offline
My life on the forum
Possum  Offline
My life on the forum

Joined: Dec 2005
Posts: 1,600
Brisbane, Australia
I would use cable ties as a short term fix as they are easy to fit and even easier to remove with a pair of side cutters.


Re: Undertray issues [Re: djmobi] #1633311
12/06/2019 14:52
12/06/2019 14:52
Joined: Feb 2019
Posts: 45
Behind a blue gate
clanger Offline
Discoverer
clanger  Offline
Discoverer

Joined: Feb 2019
Posts: 45
Behind a blue gate
Longer term where you have a solid support, Rivet Nuts work well. I've done a couple round the front and one on an Eiffel tower where the original nut had torn out.

Re: Undertray issues [Re: djmobi] #1633320
12/06/2019 21:54
12/06/2019 21:54
Joined: Dec 2005
Posts: 882
Banbury
djmobi Offline OP
Enjoying the ride
djmobi  Offline OP
Enjoying the ride

Joined: Dec 2005
Posts: 882
Banbury
Cheers for the replies everyone. I had a proper look and the undertray is slightly damaged in a few places and has no attachments to the front bumper anymore.

I looked online and found what was described as undertray clips but by the sounds of it they won't be right if it's mainly bolts and screws.


Back Owning a Coupe
Re: Undertray issues [Re: djmobi] #1633328
13/06/2019 09:48
13/06/2019 09:48
Joined: Sep 2007
Posts: 537
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 537
Freedom
If you get some large washers, you should be able to re-attach everything nice and tight. Even over the ripped parts

If there is a bit of rattle with the under-tray where its ripped and vibrating against the bolts just extra tie that area down with tie cables.

Hopefully you won't have any problems moving forward.

Regards

MM

Re: Undertray issues [Re: Master_Mariner] #1633333
13/06/2019 12:06
13/06/2019 12:06
Joined: Dec 2005
Posts: 1,600
Brisbane, Australia
Possum Offline
My life on the forum
Possum  Offline
My life on the forum

Joined: Dec 2005
Posts: 1,600
Brisbane, Australia
Originally Posted by Master_Mariner
If you get some large washers,
MM


What us "old blokes" refer to as "Penny Washers", because of their size,


Re: Undertray issues [Re: djmobi] #1633334
13/06/2019 12:43
13/06/2019 12:43
Joined: Sep 2007
Posts: 537
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 537
Freedom
Shhhh Possum...but your right. Very Old.

:-)

Re: Undertray issues [Re: djmobi] #1633338
13/06/2019 14:25
13/06/2019 14:25
Joined: Feb 2006
Posts: 111
Newbury
MIB Offline
Club Member 1579
MIB  Offline
Club Member 1579
On a journey

Joined: Feb 2006
Posts: 111
Newbury
The fixings that slide onto the front edge of the undertray are M6 Chimney Nuts.
I bought 20 on E-bay from adl-componentsltd, described as 'M6 Chimney Nuts Lug U-Nut Speed Threaded Fasteners Spire Captive Clips Fixings' for about £6 delivered.


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Re: Undertray issues [Re: djmobi] #1633359
14/06/2019 08:47
14/06/2019 08:47
Joined: Dec 2005
Posts: 882
Banbury
djmobi Offline OP
Enjoying the ride
djmobi  Offline OP
Enjoying the ride

Joined: Dec 2005
Posts: 882
Banbury
Thanks for all the advice everyone. I have temporarily sorted it and have ordered some m6 chimney nuts to do it properly later


Back Owning a Coupe
Re: Undertray issues [Re: djmobi] #1633581
25/06/2019 22:20
25/06/2019 22:20
Joined: Jan 2008
Posts: 191
Isle of Wight,
Skiday Offline
Club Member 1700
Skiday  Offline
Club Member 1700
On a journey

Joined: Jan 2008
Posts: 191
Isle of Wight,
Isn't it illegal to fit after-market HID lights nowadays?


20VT, Aston DBS, Ferrari F355
Re: Undertray issues [Re: djmobi] #1633602
26/06/2019 17:50
26/06/2019 17:50
Joined: Dec 2005
Posts: 32,174
Hemel in the Hempstead
barnacle Offline
Club Member 18 - Minister without Portfolio
barnacle  Offline
Club Member 18 - Minister without Portfolio
Forum Demigod

Joined: Dec 2005
Posts: 32,174
Hemel in the Hempstead
Yes. Also LED lights. I believe it's also part of the MOT check, too.


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