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#817221 01/17/2012 10:43 PM
Joined: Nov 2009
Posts: 239
D
'Bolter
'Bolter
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Joined: Nov 2009
Posts: 239


Can a mechanical vacuum advance work intermittently or is it an all or nothing scenario?

Thanks,
Dale


When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
-Unknown-
di1953gmc #817232 01/17/2012 11:44 PM
Joined: Oct 2006
Posts: 9,671
D
'Bolter
'Bolter
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Posts: 9,671
It's simply a vacuum diaphragm, when the is vacuum suck the air out of it, it moves in compressing a
spring and when the vacuum is removed and it rises back up to atmospheric pressure the spring pushes
it back to its stop.
If you mean by intermittent, can it operated in between full vacuum advance and no vacuum advance,
yes. I does operate anywhere in between depending on the strength of the vacuum signal.

Denny graham
Sandwich, IL


Denny G
Sandwich, IL
Joined: Aug 2011
Posts: 835
K
Shop Shark
Shop Shark
K Offline
Joined: Aug 2011
Posts: 835
Dale,

If you have a hole in the diaphragm, the vacuum advance is not going to work at all. So it's an all or nothing scenario. The mechanical advance would still work however.

(Denny, just another interpretation of what the "intermittent" question might mean)

Kurt

Joined: Nov 2009
Posts: 239
D
'Bolter
'Bolter
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Joined: Nov 2009
Posts: 239

thanks,

What I meant was, can it work... moving the distributor then not work, then work again under normal circumstances?

you both have answered my question. I must have another issue.



When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
-Unknown-
di1953gmc #817272 01/18/2012 1:53 AM
Joined: Oct 2006
Posts: 9,671
D
'Bolter
'Bolter
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Posts: 9,671
Oops, thought I read into it that he was asking about the vacuum advance not the
centrifugal mechanical advance.

DG


Denny G
Sandwich, IL
Joined: Jun 2008
Posts: 145
H
Wrench Fetcher
Wrench Fetcher
H Offline
Joined: Jun 2008
Posts: 145
When I got my 54 the po said the vac. advance worked when it was warm. I never found that and replaced it. I guess you could call that intermittent.


First time I saw this truck I said "That's the one!"
1954 Canadian-built Chev Short Box

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