Anybody know the bolt size and thread pitch for the last 2 bolts all the way toward the back of an 03 S-type R's undertray? I've got upgraded fasteners for all of it except those two, and I can't seem to find any that fit.

(I lost the fasteners due to an unfortunate roadkill incident that I'm still rectifying)

 

Hmmm.. You say you need bolts?? On my 05 they weren't bolts, but nuts that attached to threaded studs that clipped to the underside of the car.. But I know that things tend to change with these cars... Anyway, I believe the nuts were 6mm x 1.5 pitch, but I may be wrong.

If someone else doesn't pipe up, a quick call to the dealer parts desk should get you an answer.

 

Three bolts across the frt, two in the rear. The 2 studs with nuts are in the middle. Total of 7 fastener points. I have new stuff from Jag for the middle since the dealer snapped the rusted studs off at some point servicing. Only thing I remember is using a 10mm socket. When I get around to fixing it, I could check the sizes but you probably want an answer sooner than that.

Anyway that is how ours is. The brackets are just flimsy pieces of tin and parts could be swaped around.

 

Doh! See what happens when you haven't worked on one in a long time! You are correct. I forgot about the two rear most bolts that attached to the metal brackets that always seemed to move back and forth. Anyway, I'm pretty sure they are 6mm bolts (yes, 10mm socket). Needed 10mm socket and a phillips head screwdriver for mine as well.

 

Anybody out there know the length, thread, pitch? Anybody?

 

I'm wondering why anyone would.

If I wanted more fasteners and couldn't figure out what they were I'd improvise or if desperate I'd buy more from a dealer.

 

I've seen several people on these forums comment on replacing all of their fasteners with stainless in order to prevent/slow corrosion from winter weather, I figured they may recollect the size or still have some leftovers in the packaging out in the garage.

At this point I could go buy every 6mm bolt with a 10mm head and hope one fits... not optimal.

 

IIRC they are M6, Bodymans 10mm socket would confirm that, standard pitch is 1mm, I'd guess anywhere between 20-30mm will work for length.

 

Yeah, you could do that but it would be about as sensible as your statement.

Anything that fits will do. I've yet to meet anyone who works on cars who doesn't have various sizes of nuts, bolts etc "spare" from one car or another or who can't remove them from another part of a car to see what fits good enough. Especially when you have what others have posted already as a guide. Getting hands dirty is often the best thing rather than hoping someone will do it all for you via a keyboard.

 

Everyone has this problem at one time or another - I have changed my fittings for expandable rubber screw plugs. This is a rubber tube with a shoulder, a s/st nut molded inside and a s/st screw going through the middle. when you tighten the screw the rubber sleeve expands and gives you a good fixing for splash shields, I would not use them for a critical fixing but for this use they are great. First used them on a Merc 4x4 on the 3 x splash shields underneath as trying to get replacement parts was a nightmare and costly. They come in various sizes and don't need any threads just a hole to poke them in. Most good Engineering fixings suppliers will have them -
1/4 of the price of manufacturers fittings ( £3 for 18 [6mm] )
Also use them for mud flaps and various fittings around car/boat.
Worth a try

 

Putting my 05 S type away for the winter today; blocking the wheels, coat of wax, fuel conditioner, etc., noticed the under tray loose at the rear connections points. Ill not do anything until the daffodils appear, but when I do your suggestion makes great sense. Thanks.

 

If you would get the free JEPC from this site you could look it up yourself instead of someone else!!

It is free! Plus it has so much more.
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