| T.V.S. vacuum line conundrum [message #259131] |
Sun, 17 August 2014 14:31  |
thorndike
Messages: 406
Registered: January 2011
Location: Conifer, Colorado
Karma: 0
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While trying to straighten up under the engine hatch, I discovered a loose vaccum line.
This is the line that connects to port "MT", the bottom of the three ports on the Thermal Vacuum Switch. According to the manual, it should connect to a tee fitting that branches off to the manifold elbows. Here is my problem, I don't seem to have any manifold elbows, and I can't find any open vacuum ports either. Should this port be capped or what? I can post pictures of the manifold if anyone needs to see one.
Bob
Robert Peesel
1976 Royale 26'
Side Dry Bath
Conifer, Colorado
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| Re: T.V.S. vacuum line conundrum [message #259134 is a reply to message #259133] |
Sun, 17 August 2014 14:50  |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
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Just remove all the lines going to the TVS. I really doesn't do anything useful. Run the hose from the vacuum advance directly to the carb. Make sure the hoses are plugged or the ports they go to on the manifold and carb are capped. You don't need to cap the TVS ports. I removed mine completely about a year ago and installed a direct reading temperature gauge instead.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
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| Re: [GMCnet] T.V.S. vacuum line conundrum [message #259143 is a reply to message #259135] |
Sun, 17 August 2014 15:40 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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It is your choice as to what you want to do, however having been in many
situation where the engine was heating up with A/C on in downtown St Louis,
the engine rpm came up enough and kept the temperature down.
I see so many coaches come in with vacuum lines disconnected or mis
connected.
Moat do not see the value of the Port Vacuum and where it is on the carb.
You'll hear me yelling at our guys about improper vacuum connection.
I have no patience with our guys as they know better and will chew them out
in front of a customer.
If you know more than the people at GM, then do it.
On Sun, Aug 17, 2014 at 12:54 PM, Bill Wevers wrote:
> The MT port opens when the engine overheats and advances the ignition
> timing to cool the engine.
> In this photo you can see where the manifold vacuum port was originally,
> unless it has been removed:
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: T.V.S. vacuum line conundrum [message #259161 is a reply to message #259131] |
Sun, 17 August 2014 18:55 |
thorndike
Messages: 406
Registered: January 2011
Location: Conifer, Colorado
Karma: 0
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Senior Member |
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I found the manifold connection. Not only was I looking in the wrong place, it was buried under other lines. Thanks for posting the manifold picture bwevers!
I added a T connector to the line going to the manifold port as shown in the manual so everything should be cool!
JimK, I agree with you, I am not knowledgable enough to begin changing things from the way they were designed.
Bob
Robert Peesel
1976 Royale 26'
Side Dry Bath
Conifer, Colorado
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