what is it for
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what is it for
on the front of my 351M motor i have a 3 prong vacuum tree about 2.5 inches tall i was told it had something to do with heat regulating. does anyone know what it is and where the lines would go? there are no vacuum lines attached to it and i can't seem to find it on a schematic. the motor is in a 78 f-150 4x4.
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From: Kansas City, KS
I assume you're referring to the one on top of the thermostat housing.
Mine wasn't hooked up either. After disassembly, it appeared to be a temperature sensitive switch...i.e. as the coolant warmed up, the vacuum was redirected. I imagine the temerature controlled vacuum would have gone to the choke.
However, as I said, mine wasn't hooked up, and the switch wasn't healthy, so I just pulled it out all together and used that port for a mechanical water temp gauge.
Mine wasn't hooked up either. After disassembly, it appeared to be a temperature sensitive switch...i.e. as the coolant warmed up, the vacuum was redirected. I imagine the temerature controlled vacuum would have gone to the choke.
However, as I said, mine wasn't hooked up, and the switch wasn't healthy, so I just pulled it out all together and used that port for a mechanical water temp gauge.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
D7AZ-12A091-A .. Distributor Vacuum Control Valve~fits 1977/79 E & F100/350 351M/400 and dozens of other applications.
It's part of the smog system, that's prolly why it isn't hooked up. These have been on most Ford cars and trucks since 1968 (there are others besides the one I listed, some have 4 ports). Many have been removed, or have had the vacuum lines disconnected.
It's part of the smog system, that's prolly why it isn't hooked up. These have been on most Ford cars and trucks since 1968 (there are others besides the one I listed, some have 4 ports). Many have been removed, or have had the vacuum lines disconnected.
Last edited by NumberDummy; Apr 6, 2007 at 08:10 AM.
Posting Guru
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From: East Flat Rock NC
You may want to look at these,
https://www.ford-trucks.com/user_gal...136672&width=0
http://www.clubfte.com/users/mil1ion...mDiagrams.html
Wally Womack
https://www.ford-trucks.com/user_gal...136672&width=0
http://www.clubfte.com/users/mil1ion...mDiagrams.html
Wally Womack
Last edited by Pro-Street/StateTK; Apr 6, 2007 at 10:01 AM.
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From: Kansas City, KS
Originally Posted by tcbofade
it appeared to be a temperature sensitive switch...i.e. as the coolant warmed up, the vacuum was redirected. I imagine the temerature controlled vacuum ...
Those diagrams are clear as mud to me.
Dennis, could you label the switch in question on that diagram? Pretty please?
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Directly right of the word FRONT.
This gives me an idea for a part identification album
This gives me an idea for a part identification album
Last edited by Mil1ion; Apr 6, 2007 at 02:38 PM.
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Hotshot
Joined: Apr 2006
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From: Kansas City, KS
Thank you.
As you know, I'm about to begin a rebuild on a 400 then do an engine swap.
Seems to me that I read somewhere that I can leave most of these vacuum lines out of the plan.
I need to have a vacuum line for the distributor, one for the transmission modulator, and one for the choke....that I know of...is any of the rest of this really needed?
(Sorry for the hijack...)
As you know, I'm about to begin a rebuild on a 400 then do an engine swap.
Seems to me that I read somewhere that I can leave most of these vacuum lines out of the plan.
I need to have a vacuum line for the distributor, one for the transmission modulator, and one for the choke....that I know of...is any of the rest of this really needed?
(Sorry for the hijack...)
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Joined: Jul 2001
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From: MD
Originally Posted by Mil1ion
Directly right of the word FRONT.
This gives me an idea for a part identification album
This gives me an idea for a part identification album
I'm still figuring this stupid vacuum schematic on my 400. I need a walk through.
