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MG Midget and Sprite Technical - Ignition timing adjustment query

The micrometer adjuster on the vacuum advance is worn and no longer "clicks". Does anyone know how many clicks there are to a complete turn of the adjustment nut? Knowing that, I could mark the nut so I can reliably return it to its original setting when adjusting.
The Leyland Workshop manual says approx 55 clicks to each graduation on the adjusting spindle, so I could work it out with the distributor removed, but I don't want to do that and disturb the basic timing setting.
The car is a Mk3 midget with mildly tuned 1275 engine.
Can anyone help?
Peter Blockley

From what I remember, there are 55 clicks in total, 11 clicks per degree, giving a total adjustment range of 5 degrees.

I'm not sure what it is that you're trying to achieve.
Dave O'Neill 2

Dave
Thanks for the information. I already knew that, but it has set me thinking that if I mark the present position, then fully retard the timing nut and count the revolutions to full advance, i.e. 5 degrees, I will have the information I need.

Problem solved, so thanks for the nudge in the right direction.
Peter Blockley

This thread was discussed on 30/11/2016

MG Midget and Sprite Technical index

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