Haven't experienced this particular Healey joy (yet), but Alan's diagnosis
sounds very likely.
In addition, the large vacuum cylinder is lined with a magical 'dry lubricant.'
Along with a too large/firm/stubborn
seal, this lubricant may be eroded enough to contribute to the problem, and
should be restored. I used one of these
products (most likely, the 28A):
http://www.sandstromproducts.com/air-dry.html
Unfortunately, this stuff is beau coup expensive, and has hazmat shipping
requirements. One can would probably do 20
boosters, and it expires after a couple years.
I don't know if there's a definitive way to tell if the lubricant should be
renewed, but if the booster has over 100K
miles it may need it.
Bob
On 5/23/2012 3:28 AM, healey.nut at gmail.com wrote:
> Chris -
>
> The rubber seal used under the leather seal of the vaccum piston needs to be
> cut in about half. The leather seal only needs a slight amount of pressure
> from the rubber to work properly.
>
> Many kits use a rubber seal that's either too firm or too big, and it causes
> the piston and the can to lock shut.
>
> Very common problem for years.
>
> Hope that helps.
>
> Alan
>
> Sent from my BlackBerry. smartphone
> www.blackberry.com
>
>
>
--
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Bob Spidell San Jose, CA bspidell at comcast.net
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