Gav_b89 Posted September 23, 2018 Share Posted September 23, 2018 Hi I'm Gav, new to the forum and new to 4x4 in general, I have picked up my 1st discovery (300tdi) I have read a few threads on here about box section sills. If any of you can help I'm after a bit of advice, I've bought some 100x60 box section and am going to fit them over the next couple of weeks, my sills am pretty much non existent. I am going to remove doors and brace the a,b and c pillars to stop any movement. My inner sills are half rotten. Do I need to keep/replace these when i box section for mot purposes or can I do away with them? My front and rear mounts am rotten too so I will be buying new ones. Pics as follows Thanks in advance Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted September 24, 2018 Share Posted September 24, 2018 I believe the 100x60 is chosen so that it replaces the entire cill box, i.e. Inner and outer cills. Quote Link to comment Share on other sites More sharing options...
Gav_b89 Posted September 24, 2018 Author Share Posted September 24, 2018 Ahh cheers mate so it will have no problem with the mot man then? Quote Link to comment Share on other sites More sharing options...
Snagger Posted September 27, 2018 Share Posted September 27, 2018 That's right. The existing sill forms a box section, so if you fit preformed box, there is no need for anything more. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted September 27, 2018 Share Posted September 27, 2018 Yup indeed, sorry, didn't see your other reply. Quote Link to comment Share on other sites More sharing options...
SPendrey Posted September 27, 2018 Share Posted September 27, 2018 Just for your information, I did mine a couple of years back. The inner sills on both sides were OK, so I sort of welded the box section 'inside'. What I mean is, I cut the outer sill away bar the top centimetre or so, and reduced the height of the inner sill to about 5cm, then used those surfaces to weld to. At the rear wheel arches I didn't close off the box section, instead I inserted plastic caps. This way I can (and did) spray the inside with rust preventing stuff. Quote Link to comment Share on other sites More sharing options...
Gav_b89 Posted September 27, 2018 Author Share Posted September 27, 2018 Cheers for the replies, I'll go ahead and start chopping the weekend 😎 Quote Link to comment Share on other sites More sharing options...
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