Lotus Elan

Servo Non Return Valve Sticking

PostPost by: david.g.chapman » Tue Apr 16, 2019 12:22 pm

I have this problem now and again. the non return valve seems to get sticky after a few weeks driving, and needs a fair puff to release it. I also notice that the first time I try the servo after startup it does not always operate properly.

When I take the non return valve out and clean it with petrol the problem goes away.

It seems that unburnt fuel might be getting to it and gumming things up? Normally the non return valve is at a high point in the vacuum line and my valve is low, and close to the servo (the valve was rattling where it used to be). Could this be the issue?

Dave Chapman.
Fourth Gear
Fourth Gear
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Joined: 26 Nov 2003
Location: Writtle, Essex

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