Lotus Elan

S4 - Bolt through rear underbody

PostPost by: Gorpon73 » Wed Nov 20, 2019 7:13 pm

Hi,

Anyone possibly tell me what the bolt is protruding from the underside of the right rear body? I see most cars with this having a washer and nut affixed to this bolt on the outside of the body. Having trouble finding this in my manual and not keen to pull my fuel tank to discover what it is for?

Cheers
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PostPost by: seriouslylotus » Wed Nov 20, 2019 7:16 pm

Fuel tank fixing....
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PostPost by: MarkDa » Wed Nov 20, 2019 7:51 pm

+1 to fuel tank.
I put a dome nut on it to smarten it up a bit
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PostPost by: Gorpon73 » Wed Nov 20, 2019 9:39 pm

Fabulous, thanks!

Possibly know the thread pattern for this bolt? Nothing I have around seems to fit....

Cheers, DJS
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PostPost by: MarkDa » Wed Nov 20, 2019 10:02 pm

1/4" probably unc if I remember correctly.
I fear I may have cut to length and cross threaded a 6mm dome nut onto it as I view it as a "one time" fixing.
Last edited by MarkDa on Thu Nov 21, 2019 6:37 pm, edited 1 time in total.
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PostPost by: Gorpon73 » Thu Nov 21, 2019 4:49 pm

Haha. Sound logic from where I'm standing. Thanks for the info.

Cheers.
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PostPost by: Pastapesto » Thu Nov 21, 2019 7:48 pm

Not sure but I think it's an UNF thread & not UNC......I'll check later & if I'm wrong.

If it has a non original tank then there is the chance it is something else of course.

Hope that helps

Adam
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PostPost by: Gorpon73 » Fri Nov 22, 2019 8:37 pm

OK, thanks for the info.

I've tried everything I had in my various piles, but nothing fit yet.

Looks to be a very narrow thread....
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PostPost by: MarkDa » Fri Nov 22, 2019 10:34 pm

Could be 6mm?
Do you have a diameter and thread pitch?
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PostPost by: oldelanman » Sat Nov 23, 2019 2:54 pm

If your fuel tank is original it will definitely be 1/4" UNF as stated above (just checked mine to be sure) but if it's a replacement tank it could be anything and as Mark says you will have to measure it. Could it be that your thread is corroded or gummed up if the nut has been missing for a while and just needs cleaning up ?
Roger
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PostPost by: MarkDa » Sat Nov 23, 2019 5:33 pm

Yes - a bit of oil and then hand run a 1/4 unf die down it ought to do the trick to get it operational.
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PostPost by: oldelanman » Sat Nov 23, 2019 5:53 pm

MarkDa wrote:Yes - a bit of oil and then hand run a 1/4 unf die down it ought to do the trick to get it operational.

Or ... if you don't have a die you can just use a nut with a saw cut at right angles to the thread, works just as well.
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PostPost by: Gorpon73 » Sat Nov 23, 2019 9:35 pm

Thanks for the advice.

It's a 1/4-28. Got it all stitched up....

Cheers
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PostPost by: MarkDa » Sat Nov 23, 2019 10:22 pm

Well done - yes that's standard unf.
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