Lotus Elan

Vacuum pods S3

PostPost by: phil1800 » Tue Aug 01, 2017 4:13 pm

Recently I bought my first Lotus, a 1967 S3SE DHC. My questions is about the vacuum pods: The vacuum from the engine is routed via the vaccum dash switch to the LH pod and from there to the RH pod. Is the vaccum of the RH pod dependent on the LH pod, or is the vaccum line split in the LH pod? My LH pod is not working, but the RH is, so I wonder how this could be.?..Most likely a stupid question...

Thank you!

Phil
phil1800
First Gear
First Gear
 
Posts: 25
Joined: 29 Jul 2016
Location: Germany

PostPost by: billwill » Tue Aug 01, 2017 11:52 pm

If the LH pod is not working and the RH one is, I would guess that either the inlet pipe of the LH pod is clogged up or the rod that pokes out of the top hole has become disconnected from the diaphragm inside.

It is unlikely to be a split diaphragm or a hole in the lower metal case as that would tend to let the ambient air in and prevent the other pod from working.


Image


lotus-chassis-f36/vacuum-pod-repair-t25234.html#p164248
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4721
Joined: 19 Apr 2008
Location: London UK

PostPost by: oldelanman » Wed Aug 02, 2017 9:42 am

Check the system for leaks - usual place is the Tee piece on the front crossmember which is the vacuum reservoir - and also check the pods are moving freely on their pivots. Low vacuum and a stiff LH pod could combine to produce your symptoms.
Roger
S4 DHC
oldelanman
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1676
Joined: 02 Jan 2008
Location: Dorset UK

PostPost by: Elan45 » Fri Aug 04, 2017 1:33 pm

If your LH pod is not operating but the RH one is, that tells me the LH one is holding vacuum, so your problem must be in the operating links between the vac chamber and diaphram and the headlamp pod. I suppose it could also be something locking the pod from pivoting on its axis. Can you raise the headlamp by hand against the spring force?

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: 885
Joined: 23 Nov 2008
Location: Ohio, USA

PostPost by: phil1800 » Fri Aug 04, 2017 6:56 pm

Thank you all for your input. I can raise the lh easily against the spring. I have 'tested' the vaccum pod with my mouth(tasty) and the rubber seems to be intact.
phil1800
First Gear
First Gear
 
Posts: 25
Joined: 29 Jul 2016
Location: Germany

Total Online:

Users browsing this forum: SimonH and 9 guests