 | Home > Technical > Front Mud Flat bolt thread |
 
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| AndyS Member Since: 18 Aug 2012 Location: London Posts: 595   
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Hello,
I tried to put my front mud flaps back on today (after Dinitroling the chassis a while back) but I'm having trouble getting the bolts out (2011 110). They're not tight, they spin freely, but I think LR used one of them inserts that goes into the chassis hole rather than thread the actual hole, the insert must have the thread that the bolt screws into. However, it seems the insert is spinning freely in the hole now it's nicely lubricated with all that Dinitrol. The question, how to I get the bolts out? I've tried using mole grips on the bolt and pulling the bolt while turning to try and get the insert to grip against the chassis but no luck. You can get to the back of the bolt just about but there isn't sufficient space to get any tools up there (the back of the bolt is in a chassis leg). Help appreciated. Thanks. |
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28th Sep 2014 9:12pm |
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| Matt Member Since: 28 Feb 2011 Location: Aylesbury, Bucks Posts: 177 
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I've used a hacksaw before to cut the bolt heads off to remove the mudflap, then punch the rivnut with the remains of the bolt back into the chassis rail. You will then need to install a new rivnut and a bolt.
The bolt threads corrode to the rivnuts and seize so when you try to undo them, it just makes the rivnut spin, is a fairly common problem. 15 plate 2.2SW XS |
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28th Sep 2014 9:32pm |
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| Grouse Member Since: 16 Apr 2012 Location: on the hill Posts: 513 |
Forget the rivnuts, get rid of the old ones, drill new holes and use self tapping bolts - you can remove and refit then at your hearts content - and re tighten without issue - rivnuts are a bloody nightmare, ok when new but crap once light corrosion sets in, they work loose with use in the hole, spin and are always slack once re tightened - hate them
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29th Sep 2014 7:02pm |
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| MartinK Member Since: 02 Mar 2011 Location: Silverdale (Lancashire/Cumbria Border) Posts: 2664 
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Whilst I'm unsure of the exact position for your particular issue...
When I fitted side steps, LR themselves use rivnuts into the chassis rail. I bought some 110mm bolts and they pass through the whole chassis rail, so no need for rivnuts, and IMHO a better system (plus I used stainless fasteners, and squirted loads of dinitrol). Job sound Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's) |
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29th Sep 2014 7:52pm |
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| AndyS Member Since: 18 Aug 2012 Location: London Posts: 595
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Thanks chaps, looks like brute force is needed.
I managed to get my phone camera up through the chassis hole to have a look, I might be able to get a small set of mole grips on the back of the insert so I'll give that a go before hitting it with increasing sizes of hammer. (Amazing how much dirt gets up there.)  |
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30th Sep 2014 6:06pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1571  
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Real pain so they are! I do as above and use the self drilling bolts too.
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1st Oct 2014 10:53pm |
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