Tightening vacuum advance pipe

Harrris303 · Oct 26, 2011

Hi all, I'm having trouble getting my SIII running nicely on acceleration and I've just noticed that the vacuum advance pipe from the carb to the distributor is only slotted on at the carb end, whereas all the other pipes are clamped on with those circular ratchet things that you tighten with a screwdriver (if anyone can tell me what they're actually called it would be useful).
Seems to me that if something needs a vacuum to operate then it best be airtight...

Anyway, just wondering if clamping the vacuum pipe on might help the running of the engine (on acceleration), and if so does anyone know where I could get my hands on some of the ratchet things i need.

Cheers.

jamesmartin · Oct 26, 2011

hose clip .vacuum pipes dont need a clip, suck through manifld end to see if diaphragm still holds vacuum and moves plate in dizzy

Beneagles · Oct 26, 2011

Jubilee clip or jubilee hose clamp.
Vacuum pipe is usually just a push fit...I think

Harrris303 · Oct 26, 2011

Ok brilliant, I was kind of hoping that might be the cure for some of my problems but things are never that simple are they?
I'll definitely check out the diaphragm thing though when I get home.

Cheers guys.

oxides · Oct 26, 2011

They're a push fit 'cos the vacuum sucks them on. I've had a few perish and once they lose their stretch and get sloppy they tend to suck air in - you can usually hear it hissing. Might be worth replacing the pipe anyway.

Harrris303 · Oct 28, 2011

Yeah I may as well because it looks like I need a whole new vac adv unit anyway. I'm assuming the diaphragm should be totally airtight, which I've now found out mine isn't. It still moves the mechanism but when I took it off and sucked on it there was definitely some air getting through.
I've found the right part at my local landy specialist but unfortunately it's £40 (it's a genuine part at least). There are others on the internet but it's impossible to tell if they're the right ones from the pictures.
Anyway, I hope it makes a difference...

Thanks for the replies.

oxides · Oct 28, 2011

Buy a new dizzy complete - there have been some good deals on these recently.

Harrris303 · Oct 29, 2011

That's a good idea actually. Having just looked at prices they're nowhere near as expensive as I would've thought. Cheers.

Cal110 · Nov 11, 2019

Hi,
Having trouble starting my 1969 series2A. Noticed the hollow copper core leading from diaphragm to carburettor was not connected - would this be an issue?

Zero sound from starter. Last time it was started it seemed stressed and didn’t fire first time. Somethings there would be a humming noise not starting.

Replaced distribution head and rotator arm along with condenser.
Replaced ignition coil a few months ago. Lights on dash are on and battery reads 12.08 - also tried jumping it.

Any help would much appreciate.

Best

Cal

Tightening vacuum advance pipe

Harrris303

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jamesmartin

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Beneagles

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Harrris303

Active Member

oxides

Well-Known Member

Harrris303

Active Member

oxides

Well-Known Member

Harrris303

Active Member

Cal110

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