Lotus Elan

Sealing Temperature Sender

PostPost by: William2 » Thu Sep 15, 2016 4:21 pm

My car has a very small leak around the temperature gauge sender union that screws into the cylinder head. What is the best product for helping to seal the threads. I have noticed that on my particular union adaptor that the threaded part that screws into the head is shorter than the other side which doesn't help to get a good seal.
William2
Fourth Gear
Fourth Gear
 
Posts: 943
Joined: 20 Jan 2013
Location: West Sussex

PostPost by: KevJ+2 » Thu Sep 15, 2016 4:28 pm

I think I would use pva tape on the thread.
KevJ+2
Fourth Gear
Fourth Gear
 
Posts: 819
Joined: 23 Aug 2013

PostPost by: KevJ+2 » Thu Sep 15, 2016 5:54 pm

Hmmm...thought about this. Although I did this on mine and all was okay, I suppose it could cause a loss of earth connection if too much is used or needed!
Just an afterthought :roll:
KevJ+2
Fourth Gear
Fourth Gear
 
Posts: 819
Joined: 23 Aug 2013

PostPost by: billwill » Thu Sep 15, 2016 11:21 pm

You need to say whether it is an electrical sensor (plus 2s) or a ether-vapour-pressure bulb and capillary tube (2--seater Elans).

The bulb type seals well with the white slippery PTFE plumbing tape.
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4723
Joined: 19 Apr 2008
Location: London UK

PostPost by: Elan45 » Fri Sep 16, 2016 7:24 pm

If you have the capillary tube type, there is a very narrow copper crush washer that goes into the bulb/ adapter connection. It will leak w/o the washer! I use teflon tape on the adapter/ head connection.

Roger
'67 Elan S3 SS DHC
'67 Elan FHC pre-airflow
'67 Elan S3 SE upgrade to 26R by Original owner
'58 Eleven S2 (ex-works)
'62 20/22 FJ (ex-Yamura)
'70 Elan +2S RHD
'61 20 FJ project
'76 Modus M1 F3
Elan45
Fourth Gear
Fourth Gear
 
Posts: 886
Joined: 23 Nov 2008
Location: Ohio, USA

PostPost by: mbell » Fri Sep 16, 2016 7:45 pm

KevJ+2 wrote:Hmmm...thought about this. Although I did this on mine and all was okay, I suppose it could cause a loss of earth connection if too much is used or needed!
Just an afterthought :roll:


I doubt it. It's a low current circuit, so would only need a very small contact patch to operate fine. Generally PVC tape will end up filling the gaps between the two threads where they occur and will be removed from the areas that the two threads are tight. Meaning the area it ends up wouldn't have provide a good electric connection to start with, so the PVC is insulating some that wasn't a connection anyway. It is removed from the tight metal to metal areas leaving a good connection.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1673
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

Total Online:

Users browsing this forum: No registered users and 11 guests