Lotus Elan

servo

PostPost by: gsl » Sun Jul 13, 2014 8:23 am

Hi guys anybody know what the air valve is for on a servo i think mine is sticking or slow to operate.

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PostPost by: au-yt » Sun Jul 13, 2014 9:00 am

Hi George
Are talking about the filter or the check valve in the vacuum line?

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PostPost by: gsl » Sun Jul 13, 2014 1:31 pm

Thanks for reply Greame dont have a check valve in line just been working on brakes with the servo vacuum line disconnected brakes work but not as effective with line connected brakes are slow to operate and slow to release as though the servo is sticking.It,s a new servo,lockheed type.I,ve checked and i can hear air valve operating and i,m now at a loss as to what to try next.

thanks
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PostPost by: types26/36 » Sun Jul 13, 2014 3:04 pm

This is quite useful to explain the workings of a Lockheed servo ( even though its fitted to an MGB)
http://www.v8register.net/FilesV8WN/Bra ... 190109.pdf
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PostPost by: billwill » Sun Jul 13, 2014 4:50 pm

Your problem may be caused by the abscence of a non-return valve in the suction pipe from the engine input throat.
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PostPost by: gsl » Sun Jul 13, 2014 7:30 pm

Thanks for input guys i dont understand the need for a non return valve in the suction pipe as the servo has a non return fitted but i will fit one to see if it cures problem.

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PostPost by: types26/36 » Sun Jul 13, 2014 8:07 pm

There is no need for another non return valve in the suction pipe if the servo has one (which most servo's do)
The brass right angled fitting fitted by Lotus to the manifold has no valve in the servo take off pipe as that is straight through, the other take off pipe to the headlights does have a one way valve in it.
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PostPost by: elansprint71 » Sun Jul 13, 2014 10:17 pm

billwill wrote:Your problem may be caused by the abscence of a non-return valve in the suction pipe from the engine input throat.


Or it could just be new.
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PostPost by: au-yt » Sun Aug 03, 2014 7:42 am

When I had my booster overhauled last month they could not get a a check valve, white plug in connection to the booster so they gave me an inline one and that works, if that's of assistance.
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