Lotus Elan

MX5 fuel filler valve not working very well

PostPost by: The Veg » Wed Apr 08, 2020 2:45 pm

I had a threaded bung brazed into the neck by my local radiator-repair shop, and then they ground-down most of what protruded on the outside so that the neck could still slip through the grommet. I think they charged me a whopping $10 for the job.
1969/70 Elan Plus 2 (not S) 50/2036
"It just wouldn't be a complete day if I didn't forget something!" -Me
User avatar
The Veg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1645
Joined: 16 Nov 2015
Location: Atlanta 'burbs (southeast USA)

PostPost by: JonB » Wed Apr 08, 2020 4:08 pm

We don't really have local radiator repair shops round here, sadly; and I have no lathe equipped friends!

Which explains why I've not tried to implement the mod yet.
User avatar
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2113
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: alan.barker » Thu Apr 09, 2020 8:29 am

What's the biggest size for a "Rivnut" :?:
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
alan.barker
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2518
Joined: 06 Dec 2008
Location: BRITTANY FRANCE

PostPost by: Mudmouse » Thu Apr 09, 2020 8:40 am

Alan, I see where you are going with a Rivnut however the shoulder on a Rivnut would be too large to get the body sealing grommet over so would not work. The outside of the filler tube must be flush. When I soldered the brass reducer to the inside of the filler tube it was very straightforward. The only issue is having a reasonably sized soldering iron, carefully cleaning the inside of the tube, good flux and preventing the solder running too far (hence use of solvent Tippex).

Steve
Mudmouse
First Gear
First Gear
 
Posts: 18
Joined: 15 May 2019
Location: Wellington, Somerset

PostPost by: alan.barker » Thu Apr 09, 2020 9:21 am

Steve,
i like the tip about the Tippex Solvent. You're right of course about no projection on O/Dia.
It's already a tight fit in the Grommet.
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
alan.barker
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2518
Joined: 06 Dec 2008
Location: BRITTANY FRANCE

PostPost by: john.p.clegg » Thu Apr 09, 2020 10:57 am

If you've a blowlamp?

Silver soldered mine...

John ;-)
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5736
Joined: 21 Sep 2003
Location: Manchester

PostPost by: Mudmouse » Thu Apr 09, 2020 11:23 am

John, I almost did the same but when I saw how close the filler cap fitting (which is soft soldered onto the filler pipe) was to the brass reducer that I fitted I decided to soft solder it to the tube. Silver solder flow temp is between 650 to 780 deg C whereas lead soft solder is 180 deg C

Did you put a heat sink on the cap end to reduce this risk?

Steve
Mudmouse
First Gear
First Gear
 
Posts: 18
Joined: 15 May 2019
Location: Wellington, Somerset

PostPost by: gav » Thu Apr 09, 2020 12:04 pm

Excuse my ignorance but where does the other end of the vent go to?
Thanks
Gavin
One day I'll actually finish - completely - one day....
User avatar
gav
Third Gear
Third Gear
 
Posts: 477
Joined: 26 Jan 2004
Location: Hertfordshire UK

PostPost by: Mudmouse » Thu Apr 09, 2020 12:25 pm

In my case the vent from the filler goes to the nearest tank vent fitting and the other vent goes via a tank pressure limit valve to the normal +2 vent which comes out by he rear wheel after going via the roof.
Attachments
DSCF0704.JPG and
DSCF0700.JPG and
DSCF0701.JPG and
Mudmouse
First Gear
First Gear
 
Posts: 18
Joined: 15 May 2019
Location: Wellington, Somerset

PostPost by: john.p.clegg » Thu Apr 09, 2020 1:33 pm

Mudmouse wrote:John, I almost did the same but when I saw how close the filler cap fitting (which is soft soldered onto the filler pipe) was to the brass reducer that I fitted I decided to soft solder it to the tube. Silver solder flow temp is between 650 to 780 deg C whereas lead soft solder is 180 deg C

Did you put a heat sink on the cap end to reduce this risk?

Steve


Not that I remember,but I may have it stood on my Steel Flatplate while doing it..

John ;-)

viewtopic.php?f=51&t=33994
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5736
Joined: 21 Sep 2003
Location: Manchester

PostPost by: alanr » Thu Apr 09, 2020 2:51 pm

Gavin,
You need to have a read of the Club Lotus Breather Mod.
Elan +2 Petrol Tank Mod.pdf
(942.32 KiB) Downloaded 64 times
Alan
'71 +2 S130/4
alanr
Third Gear
Third Gear
 
Posts: 397
Joined: 14 Sep 2018
Location: Derby. UK

PostPost by: gav » Thu Apr 09, 2020 7:33 pm

Thanks Alan

That’s a really useful article which clearly explains the issue and solution.

Much appreciated

All the best
Gavin
One day I'll actually finish - completely - one day....
User avatar
gav
Third Gear
Third Gear
 
Posts: 477
Joined: 26 Jan 2004
Location: Hertfordshire UK

PostPost by: Matt Elan » Thu Apr 09, 2020 7:57 pm

Hi Jon
I’m fully lathe equipped if you need a spot of turning once we are out of lockdown
Mat
Matthew Vale - Classic Motoring Author
1968 Plus 2 - Somewhat cosmetically and mechanically modified
1969 Plus 2S - Currently undergoing nut and bolt restoration
Visit me on matthewvale.com
User avatar
Matt Elan
Fourth Gear
Fourth Gear
 
Posts: 581
Joined: 27 Oct 2011
Location: Fleet, Hants, UK

PostPost by: JonB » Fri Apr 10, 2020 7:53 am

Oooh you lucky fellow. Mind you, if I had a lathe I wouldn't know what to do with it. I'd need training.

Thanks, I'll let you know... come to think of it, a nice drive out to your neck of the woods might be very pleasant once this is all over.

JonB
User avatar
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2113
Joined: 14 Nov 2017
Location: South Coast, UK
Previous

Total Online:

Users browsing this forum: checkrail and 6 guests