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Rear diffuser nut fixtures, pics please?

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m roj
(@rojid)
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Joined: 1 year ago
Posts: 106
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When i removed the diffuser and on refitting, found the thread had stripped, so had to do a bit of a botch job to get me through the track day.

PXL 20221030 172109959 2

I was going to helicoil thread repair it, but I've found what i think is the part on the radical catalogue, so i guess these simply screw into the chassis.

2022 10 30 20 53 25 MU0024   Rear Diffuser Nut   Radical Online

 

Could anyone share pics of what is the 'official' manufacturer way to secure the diffuser mounting holes to the nut? Is it simply just an M6 bolt and washer? 


   
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Rod Bender
(@rjbender)
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Joined: 4 years ago
Posts: 192
 

G'day,

When I received my car it just had a larger washer on the M6 Socket Head Cap Screw that was used.

I can't easily take a photo of my car today as my car is in it's trailer and the rear engine cover is on.

I converted the washer supplied to use one of these instead... it spreads the load over a larger surface on the vertical sheet metal bracket that's molded into the diffuser

image

... and then also drilled the head of the Socket Head Cap Screw to allow me to lock-wire these two bolts in situ.

One other thing to be aware of that could be the reason for the stripped thread, is that the part you have identified screws onto a 'through-bolt' (19mm from memory?) that runs from one side of the chassis to the other and fixes the bottom of the engine cradle.  What is important is to make sure that these 'rear diffuser nuts' (MU0024) are threaded onto the through bolt equally deep on both sides (within a mm or two OK).  If you have one threaded deeper than the other, then the end of the 19mm 'through bolt' will be too deep in one of the 'rear diffuser nuts'.. and this then means that the M6 bolt you are trying to screw in from the outside will 'bottom out' on the end of the 19mm 'through bolt' before it is tight against the diffuser bracket.... and this can cause it to be stripped (assuming someone was a bit heavy handed and didn't work out what is actually wrong)


   
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m roj
(@rojid)
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Joined: 1 year ago
Posts: 106
Topic starter  

well i used a helicoil thread repair kit which did the job for now so haven't bothered replacing them. Used a cap head socket screw and multiple penny washers to ensure the screw actually provided some friction. Whoever fitted them like that to the car originally....no idea what they were thinking. When i removed the diffuser to do the oil service, one side was an M6 set bolt and the other a cap head. Both were just bottomed out with the diffuser stays perched on the exposed thread. I didn't think anything of it as i thought it was just supposed to be like that. Obviously not. 

Anyway it's now all properly secure with some bolts of appriopriate length actually providing friction via the washers. 

I'd never used a helicoil type thread repair kit before, very easy to use. 


   
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Rod Bender
(@rjbender)
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Joined: 4 years ago
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@rojid .... pics from the weekend of what I was explaining I did in my original reply

image
image

   
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