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78 Vacuum Components - Need Help Identifying

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Old Sep 4, 2011 | 05:06 PM
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Default 78 Vacuum Components - Need Help Identifying
I have a 78 and there is a vacuum piece with a diaphram that baloons in and out that's right beside distributor. Trying to find out what it is called so I can order replacement. Thanks
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Old Sep 4, 2011 | 05:31 PM
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Not sure what you're referring to but suspect its the cruise control vacuum diaphram.
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Old Sep 4, 2011 | 05:47 PM
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Originally Posted by hunt4cleanair
...cruise control vacuum diaphram...

That would be my guess.

Post a pic.
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Old Sep 4, 2011 | 05:53 PM
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If you don't know what it is,why do you want to replace it ?
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Old Sep 6, 2011 | 06:41 PM
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Originally Posted by JTBMemphis
I have a 78 and there is a vacuum piece with a diaphram that baloons in and out that's right beside distributor. Trying to find out what it is called so I can order replacement. Thanks
That is called the Vacuum Particulate Encapsulator Receptacle. (Most folks just call it the Vacuum Balloon) Any extra vacuum that isn't used by the Vacuum Advance gets stored in the Vacuum Balloon, untill the Vacuum Advance needs it.


Scott
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Old Sep 6, 2011 | 06:52 PM
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Originally Posted by scottyp99
That is called the Vacuum Particulate Encapsulator Receptacle. (Most folks just call it the Vacuum Balloon) Any extra vacuum that isn't used by the Vacuum Advance gets stored in the Vacuum Balloon, untill the Vacuum Advance needs it.


Scott
I'm sorry, that's just a buncha nonsense I made up, I couldn't resist!!!!!


Scott
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Old Sep 7, 2011 | 03:05 PM
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Originally Posted by scottyp99
I'm sorry, that's just a buncha nonsense I made up, I couldn't resist!!!!!
Go to your room. No dessert for you tonight.

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Old Sep 7, 2011 | 04:17 PM
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Hi,
That answer had so many important sounding words that it had to be right!!!
Regards,
Alan

I guess to some degree a diaper is an 'encapsulator'!
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Old Sep 7, 2011 | 05:31 PM
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Originally Posted by hunt4cleanair
Not sure what you're referring to but suspect its the cruise control vacuum diaphram.
it's actually called the cruise control servo. to test if it is any good, pull the vacuum tube off the rear , then pull the bellows out from the front side (the carb side) and place your finger over the nozzle you removed the tube from before releasing the bellows. if the bellows stays expanded until you remove your finger from the vacuum tube nozzle, the servo is good. if it loses the vacuum "seal", the bellows material is leaking and it is bad. it is one of the few parts that isn't being reproduced at this point (at least that has been my experience in repairing my system on my 78). i had to find a good used one. expect to pay $75-100 for a really good used on. they are not the same in later years as the later ones have a black plastic case on them instead of the silver metal case used in the 78
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