21 replies to this topic

[RobWill116]

On my mini, the previous owner has fitted over sills, I know theres quite a few people who would advise not to fit them but them came on the car. Anyways, I am wanting to preserve the mini by waxoyling. I was told that on over sills I will need to drill a few small holes in the raised square sections for ventilation and then use the cavity extension to waxoyl inside. I just wanted to check whether this is the right thing to do before I start putting holes in it?

Thanks

[lil3on]

hi i have oversills on mine, i didnt no they were bad till people told me :/ but i was told the same about drilling a few holes, i dont no if it will work but its what im doing to mine :)



Leon

Edited by lil3on, 27 February 2012 - 10:41 AM.

[AVV IT]

Yes you should drill holes in the bottom/lowest part of the square sections, in order to replicate where the gaps would exist in vented sills, to allow both ventilation and for moisture/condensation to drain out. You can inject waxoyl via an extension probe through these holes and also via the end of the sill that can be accessed via front bottom corners of the rear companion bins. Later models also have a series of rubber stoppers inside the car, along the length of the sills, that can be removed in order to inject waxoyl through.

[mini_in_progress]

i was going to say you could drill a couple of holes in the inner sill, theres already one if you unbolt the seatbelt! just keep going till it comes out the bottom where you drill your new holes!

[RobWill116]

Thanks for replies. :) Anybody be able to upload a pic with the location of holes on vented sills please? I know where the square sections are but I just want to be sure.

[mini_in_progress]

where them square sections are on a small standard sill are the bottoms are open ill have a look in someones thread on here to find you one :)

[AVV IT]

See pic below, does this help??

[RobWill116]

See pic below, does this help??

Yeahh thanks a lot. How many holes do you reckon is needed in each section? I was thinking of 3 maybe for max

[ajpmsport]

If this comes out,i think the guys are trying to say the holes should be where the orange dots are.

Edited by ajpmsport, 27 February 2012 - 08:41 PM.

[mini_in_progress]

If this comes out,i think the guys are trying to say the holes should be where the orange dots are.

http://i860.photobuc...t/0102-Copy.jpg

thats the one :)

[RobWill116]

Cheers for the pic. Hopefully will have it done this afternoon

[lil3on]

can u upload a photo of it finished? just so i can use yours as a refrence?

cheers

Leon

[tiger99]

You really ought to replace those sills. As well as the corrosion trap, if they are welded along the lower edge, the structure is not nearly as stiff or strong as in the proper arrangement, where the welds are near the base of the inner sill, forming the box section properly. The flexing which results is one of the reasons why the corrosion happens so quickly.

It is a lot easier to replace an outer sill, than to have to replace the outer, and part of the floor pan when it rots, as it will. The inner sill is part of the floor pan, and replacement involves a long butt weld, all the way from the toeboard to the heelboard. the outer sill only needs spot or plug welding, except at the front and rear corners, where a very small amount of seam welding is advisable.

And, please, when it does go rotten, as it surely will, with or without Waxoyl, don't even think about so-called inner sills which have a cutout to fit over the crossmember. They are positively dangerous as they leave a major structural weakness. If spotted, they should be an immediate MOT fail, as they are not a like for like replacement of the original structure, or a partial panel replacement, seam welded, both of which are allowed.

[GTIAlex06]

Yeah i got oversills on and iv drilled holes and put wax oyl in there no problemo.

[tiger99]

You only think that you have not got problems. You have a serious structural deficiency, as well as a corrosion trap.