Sprint headlights closing

[WillB]

hi there,

Not sure if this is a simple problem, but my headlights are closing (72 Sprint) when i accelerate in any gear. Literally anything other than very mild acceleration is causing them to close up... and on lifting the throttle, they pop open again.

Any suggestions for cause/cure very welcome.

Best

Will

[john.p.clegg]

One thing that could cause this is the one-way valve vibrating to engine revs(mine did) a quick solution is to put another in line with it.
John

[types26/36]

Check the one way valve, its screwed into the end of the manifold then the vacuum pipe goes onto it. It should only pass vacuum one way.
Brian

[khamai]

Check out the "Headlamp" article on the Golden Gate Lotus website.
www.gglotus.org

Then go to "TECH" and check in the "ELAN" Section.

Kiyoshi
GGLC Webguy

[brassringfarm]

Hmmm--Sprints theoretically should have the Failsafe System, which means they should OPEN when vacuum lost. Regardless - I had similar symptoms (except opened upon slight acceleration, and my one-way valve innards had vibrated loose. I simply unscrewed one end of the pencil shaped valve, put a dab of lock-tight onth inner threads and tightened the inner valve body a few turns until vacuum operation was restored. Voila! My valve was purchased from Bean -so if yours is different - look for a similar adjustment.
Good luck
Paul Zimmerman
65 S2 with converted Failsafe headlights

[M100]

Not sure about Sprints having fail safe lights. Mine is a very late 72 UK spec and its always been non fail safe. Maybe it was just for export markets?

[types26/36]

Mine is a very late 72 UK spec and its always been non fail safe.

Same here,mine is October 72 and also a non-failsafe.
Brian.

[WillB]

Thanks for all your advice - will have a go at the weekend!

Best

Will