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D1SCD
Member Since: 13 Feb 2013
Location: North Yorkshire
Posts: 407
  
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At least I think that's what they're called.. 
I'm in the middle of trying to remove the fuel tank, but now every bolt I've tried to remove is spinning 
The spire nuts are rusted and have broken free - any suggestions how I can get them off ?
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 2nd Oct 2022 7:48 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
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I had the same thing, i had to drill the heads off one of my bolts and then get the bolt out of the chassis with a magnet.
Did you buy new nuts? Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 3rd Oct 2022 6:17 am |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26714
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They are Rivnuts. Drill out the heads, remove the tank, and then drill out the old rivnut. You can set a new rivnut with a special tool, or improvise with a suitable bolt and washers.
Just Google rivnut to find out more. I put plenty of anti-seize compound on the replacement bolts. You may have to install a larger rivnut if the hole is oversized by the old nut spinning.
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| 3rd Oct 2022 8:51 am |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12725
 
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Some rivnuts have a bigger outside diameter. Have a look at the set from screwfix. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer  ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
Last edited by Hardware on 3rd Oct 2022 6:40 pm. Edited 1 time in total
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| 3rd Oct 2022 9:08 am |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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They're not rivnuts, they are M10 'U' spring nut KYH500100 my advice would be to use an angry grinder to take the heads off the bolts and push the remnants into the chassis where you can hopefully fish them out with a magnet or seal them in their rusty grave with some expanding foam...
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| 3rd Oct 2022 3:23 pm |
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Moleshome
Member Since: 15 Oct 2020
Location: Wokingham
Posts: 412
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I could be wrong, according to my wife it wouldn't be the first time, but I thought using expanding foam inside metal cavities was a seriously bad idea due to it trapping moisture?
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| 3rd Oct 2022 3:27 pm |
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D1SCD
Member Since: 13 Feb 2013
Location: North Yorkshire
Posts: 407
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Flatlander wrote:They're not rivnuts, they are M10 'U' spring nut KYH500100 my advice would be to use an angry grinder to take the heads off the bolts and push the remnants into the chassis where you can hopefully fish them out with a magnet or seal them in their rusty grave with some expanding foam...
I had thought angle grinder, but was thinking everyone would say bad idea near fuel tank..
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| 3rd Oct 2022 4:10 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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It's diesel so unlikely to flash over in current temperatures and you'd have to be going some to get through the tank guard and into the tank without realising, plus the fuel would most likely short out the grinder motor causing the RCD to trip first...
How do you suppose it's done in a workshop? 
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| 3rd Oct 2022 6:11 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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Moleshome wrote:I could be wrong, according to my wife it wouldn't be the first time, but I thought using expanding foam inside metal cavities was a seriously bad idea due to it trapping moisture?
That part wasn't entirely serious, but given the corrosion likely to be inside the chassis rails already, it's not likely to bond in any meaningful sense - but it would dampen the rattling of the loose bits... I think you'd get through several D3 bodies before the chassis shows any signs of weakening due to corrosion - a couple of blobs of expanding foam or not.
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| 3rd Oct 2022 6:15 pm |
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Moleshome
Member Since: 15 Oct 2020
Location: Wokingham
Posts: 412
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Fair enough, so my wife was right again 
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| 3rd Oct 2022 9:06 pm |
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