| Aux vacuum pump whistle [message #206397] |
Tue, 30 April 2013 08:53  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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Recently installed a JC4 Aux. vacuum pump. Works fine, but emits a loud whistle when operating and until it empties. I assume its leaking from the grommet on the booster.
Anyone have a part # for this grommet, or any other solution?
Thanks.
77Palm Beach 403
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| Re: [GMCnet] Aux vacuum pump whistle [message #206405 is a reply to message #206398] |
Tue, 30 April 2013 10:03  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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RD,
Seems to me that it would be a bit easier to drive the GMC to AutoZone and buy a new grommet:
http://tinyurl.com/c8f95ex
http://www.autozone.com/autozone/accessories/Help-1-2-in-i-d-grommet-fits-3-4-in-dia-hole-and-13-16-in-i-d-grommet-fits-1-1-16-in-di
a-hole-fits-most-common-brake-check-valves/_/N-25pd?itemIdentifier=237990_0_0_
Regards,
Rob M.
-----Original Message-----
From: gene Fisher
mount it in series with the manifold vacuum like this
http://www.gmcmhphotos.com/photos/vacuum-booster-pump-auxiliary-gmc-jc4/p27712-yeager.html
good luck
gene
On Tue, Apr 30, 2013 at 6:53 AM, R.D. Hart <regor5556@yahoo.com> wrote:
> Recently installed a JC4 Aux. vacuum pump. Works fine, but emits a loud
> whistle when operating and until it empties. I assume its leaking from the
> grommet on the booster.
> Anyone have a part # for this grommet, or any other solution?
> Thanks.
>
> 77Palm Beach 403
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Aux vacuum pump whistle [message #206408 is a reply to message #206397] |
Tue, 30 April 2013 10:30 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| biggreen wrote on Tue, 30 April 2013 06:53 |
Recently installed a JC4 Aux. vacuum pump. Works fine, but emits a loud whistle when operating and until it empties. I assume its leaking from the grommet on the booster.
Anyone have a part # for this grommet, or any other solution?
Thanks.
77Palm Beach 403
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Rob has pointed you to a source fof a gromet. But....
Seems to me that for us to properly help you troubleshoot, we would need to know how your jc4 is installed. There are a couple of ways that work.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Aux vacuum pump whistle [message #206417 is a reply to message #206409] |
Tue, 30 April 2013 11:23 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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So if it "whistles" while the pump is running and continues after you shut the pump off. It does sound like a vacuum leak. (Does it also whistle with the pump off and the motor running?)
As long as the pump is plug directly into the booster and the pump is in-line with the vacuum line to the intake, the leak can only be the pump, the booster or the grommet. Double check that the grommet is still in position and then replace it. While you have the pump off, you should be able to check it. Plug the booster side and turn it on. It should pump for a very short time and stop as it pulls a vacuum on your plug.
I assume the booster was fine before you added the JC4.
| biggreen wrote on Tue, 30 April 2013 09:03 |
Good point. Mine is plugged directly into the booster, with a filter on the way back to the motor.
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Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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