Hi All
My 59plate D4 went through its MOT today and the tester put an advisory on that there is corrosion on the chassis at the rear but not effecting structural rigidity. I’ve had a look under it and it is looking a bit scabby. Underneath and doesn’t look like it’s got any protection on anything.
Can anyone recommend a good place or person to get it cleaned up . Treated and cleaned on the underside? Ideally in the Cheshire or Staffs area please.
Cheers
Andy
17th Jul 2021 9:24 am
MJA
Member Since: 08 Jul 2021
Location: Hertfordshire
Posts: 85
Don't fancy giving it a go yourself? I had one of my cars done at place in Hoddesden when I lived down there and all they did was plaster dinitrol over the top of whatever corrosion was there. A few months later it was coming away on those areas.
If you were to do yourself or even if you want to find someone who does this sort of work do the following steps:
1. Clean up the underside, steam cleaner is pretty good. Allow to dry - weather like we are having now is perfect for this job.
2. Wire brush/mechanically get rid of surface rust. Weld where necessary (appreciate that bit might be a bit much for a DIY job, hopefully you won't need to do that on one of these).
3. Use something like hydrate 80 to convert whatever rust is left to something benign.
4. Use dinitrol 3125 in the cavities
5. Spray a light mist of 3125 over the unerbody as a "primer" for the next step.
6. Apply Dinitrol 4941 over the underbody.
Remember it is a semi flexible coating to protect. It will need topping up on jacking points and other impact areas over time.
Other products are available. I re-did mine as above (and had to weld) on my non LR. The professional place just slapped step 6 on.
17th Jul 2021 1:28 pm
Andy500
Member Since: 27 Aug 2018
Location: Cheshire
Posts: 228
Hi MJA, thanks for the advice, I would do it myself but it’s just time and space really.. I want to find someone who will do it properly like you recommend rather than slapping it on top. I found that before and after place online but after a bit of searching the feedback doesn’t look great!
You would have thought there must be someone out there with a wire brush whose willing to do a proper job! I know it will cost but figure it’s worth it.
17th Jul 2021 3:53 pm
NC500
Member Since: 18 Sep 2017
Location: On the NC500
Posts: 549
I do mine every 3 years just as suggested using Dinitrol products. Despite doing a careful proper job every time, the chassis surface corrosion does come back so it’s not a do it and forget it job I’m afraid!
18th Jul 2021 7:52 am
motorworks
Member Since: 14 Nov 2019
Location: Usk
Posts: 412
The main areas of chassis that rust are above the rear axle, especially top of the cross beam and sections that the driveshafts go through. There is not much you can achieve from underneath beyond cosmetics, even on a lift.
A good wash to remove dirt holding water against rusty metal can reduce rate of decay. Chisel or brush off any accessible loose debris. Rust remover and/or protective oil will also help, but need to repeat the process at regular intervals for best results.
If anytime the body needs to come off for a major job, that is a good opportunity to treat the chassis and make it last longer.Chris
18th Jul 2021 2:40 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20858
If its not done properly, you'll only make things worse, and accelerate the corrosion process
You really need to do it from new/nearly new, before the metalwork begins rusting, otherwise you have to remove ALL the loose and flaking rust/paintMy D3 Build Thread
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