Lotus Elan

Bellhousing bolts

PostPost by: jerryh » Wed Jan 16, 2013 9:13 am

Hi

Can anyone tell me what thread size the bottom belllhousing cover plate should be fixed with, I've tried various unc and unf but can't find anything that fits.
Any help would be most appreciated.

Cheers
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PostPost by: types26/36 » Wed Jan 16, 2013 10:05 am

jerryh wrote:Hi

Can anyone tell me what thread size the bottom belllhousing cover plate should be fixed with, I've tried various unc and unf but can't find anything that fits.
Any help would be most appreciated.

Cheers
Jerry


As I recall it is 1/4 UNC.
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PostPost by: 512BB » Wed Jan 16, 2013 10:39 am

Thats correct Brian, and I suppose, if you have already tried those Jerry, a DPO has messed with your bellhousing, and you are going to have to carry out some remedial work.

And good luck with that into cast iron.

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PostPost by: MickG » Wed Jan 16, 2013 1:27 pm

1/4 UNC on mine.
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PostPost by: jerryh » Wed Jan 16, 2013 2:11 pm

Thanks for all the replies, I have tried 1/4unc so as Leslie says a bit of remedial work required, I will run a tap through first and may get lucky.
Thanks again

Jerry
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PostPost by: CBUEB1771 » Wed Jan 16, 2013 3:06 pm

Should be an easy fix with a helicoil.
Last edited by CBUEB1771 on Wed Jan 16, 2013 3:44 pm, edited 1 time in total.
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PostPost by: oldelanman » Wed Jan 16, 2013 3:28 pm

Or....if the threads are stripped in the bellhousing you could simply use nuts and bolts instead.
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PostPost by: el-saturn » Wed Jan 16, 2013 3:43 pm

that's what i had to do to my alloy bellhouse! ------------nobody knows and nobody can see!
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PostPost by: 512BB » Wed Jan 16, 2013 5:16 pm

I don't think I would go the nut and bolt route if it were my application.

You do not say Jerry if the engine and gearbox are in situ, but if they are NOT, I would do a proper job, and get a decent welder to fill up the holes and start again. If they are in situ, then your options are somewhat limited due to access.

Good luck with it.

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PostPost by: oldelanman » Wed Jan 16, 2013 5:36 pm

Deleted.
Last edited by oldelanman on Wed Jan 16, 2013 7:27 pm, edited 1 time in total.
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PostPost by: types26/36 » Wed Jan 16, 2013 6:01 pm

512BB wrote: I would do a proper job

Well that's me put in my place then :shock: .......:[/quote]

Roger,
You are suggesting committing the ultimate sin of adding weight (some nuts) ....This violates Colins basic philosophy :lol:
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PostPost by: oldelanman » Wed Jan 16, 2013 6:27 pm

types26/36 wrote:
512BB wrote: I would do a proper job

Well that's me put in my place then :shock: .......:

Roger,
You are suggesting committing the ultimate sin of adding weight (some nuts) ....This violates Colins basic philosophy :lol:[/quote]




Fair point Brian.
Maybe the best solution for Jerry would be to discard the sandwich plate altogether and then he won't need any hardware and the weight saving will be maximised. :roll:
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PostPost by: AHM » Wed Jan 16, 2013 11:35 pm

512BB wrote:I don't think I would go the nut and bolt route if it were my application.


No neither would I. They are only holding a bit of tin in place a good clean and a bit of JB weld to glue them in situ will do it. or if they are not too bad some threadlock. No need for helicoils or welding. the only stress they see is that you have done them up!
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PostPost by: 512BB » Fri Jan 18, 2013 11:39 am

AHM wrote: They are only holding a bit of tin in place a good clean and a bit of JB weld to glue them in situ will do it. or if they are not too bad some threadlock. No need for helicoils or welding. the only stress they see is that you have done them up!

Thats not strictly true Simon. There is often a bit of tension when offering that plate up, specially if you have the correct piece of foam in place at the top of the plate. So gluing it in place with JB is not something I would use, prefering a more positive fixing method. Each to their own though.

But hey, what do I know, I haven't got many Elans.

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PostPost by: AHM » Sun Jan 20, 2013 9:44 pm

Leslie,
I am referring to the bolts as this is the subject of the thread! Clamp the plate in place (foam and all!) apply threadlock, or if needed JB weld or similar.
Let it set - Job done. It is not going to come undone!

The threads are close to the edge so the over-drilling and tapping is undesirable. Welding would introduce unnecessary stresses into the casting.

512BB wrote:But hey, what do I know, I haven't got many Elans. Leslie

What has that to do with thread repair?
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