 | Home > Maintenance & Modifications > Best way to fix these corrosion holes |
 
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| kenzle8a Member Since: 12 Feb 2020 Location: None Posts: 1074  
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(This is in no way advice as im a Scottish farmer who is prone to a good in his view bodge) I've plugged stuff like that with lumi weld or chemical metal plenty of times without a single regret. Then again I also paint most of the spots on mine with a brush...
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6th Apr 2021 10:59am |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3677  
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I had strange holes like that in the same place. Behind was a white gungy liquid, no idea what caused it. Was lucky enough that it was under warranty though so had the whole panel replaced.
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6th Apr 2021 5:35pm |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2655 
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It’s dissimilar metal corrosion, due to the steel strip behind it.
To fix it you’ll need to replace the part, which involves dismantling some of the tub panels and drilling out spot welds etc. You can fill them but it’ll keep getting worse until eventually the aluminium is all gone around the mountings. |
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6th Apr 2021 6:38pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3418  
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Indeed, it is galvanic corrosion. The good news is that the tub is protecting the chassis by sacrificing itself.
Not what you want to hear... but before repairing the holes, better try to isolate the steel from the aluminum. I have been pondering how to remove that bracket, a long angle iron, to get it galvanized as well, without removing the whole body. Have not attempted yet though. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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6th Apr 2021 6:51pm |
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| Beero Member Since: 05 Jan 2021 Location: Southampton Posts: 21 
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Mine is like that as well. Does anyone know what the part is called and how difficult it is to replace?
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6th Apr 2021 9:22pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3418
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https://yrmit.co.uk/product/rear-body-moun...series-23/
Once pulled out one out from a damaged tub. Was not easy. Lot of spot welds and IIRC a couple of rivets which are hard to reach. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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6th Apr 2021 10:44pm |
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| TamarBlue11 Member Since: 25 Sep 2020 Location: England Posts: 226 
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Thanks guys, some food for throught.
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7th Apr 2021 7:36am |
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| Oldowner Member Since: 26 Dec 2018 Location: South west Posts: 623 
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The aftermarket versions of the tub mounting rail KVU101160 only have five tabs sticking up to mount the tub to instead of the full length original rail, this prevents the majority of the rot as the steel is not there to react with the alloy in the first place.
On a 90 hardtop they can be changed in situ by unbolting the rear tub mounts, and unbolting the rear tub forward seatbelt mounts and outrigger bolts, opening the front doors and jacking the rear body up. |
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8th Apr 2021 6:11pm |
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