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  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  351c temp sensor

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Author Topic:   351c temp sensor
joerigby5836
Journeyman

Posts: 54
From: FL
Registered: Feb 2004

posted 02-23-2004 06:25 PM     Click Here to See the Profile for joerigby5836        Reply w/Quote
Hi again
here is my question the temp sensor wire is connected to the sensor at the front of the engine and t stat. Now there is also another sensor thats on the water pump at same location but the sensor has like a coil spring at the end of it. What is It?? there is not a wire on it.
Thanks in advance
Joe

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Joe Rigby
1972 351c Mach 1 Fastback

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 02-23-2004 09:20 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
Sounds like a springy thingy to me.


lol

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Alex Denysenko
Co-Administrator and Moderator

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lonewolf
Gearhead

Posts: 419
From: Colorado; M&M #3117
Registered: Jul 2003

posted 02-23-2004 10:29 PM     Click Here to See the Profile for lonewolf        Reply w/Quote
Yep. Springy thingy. Also could be a doohickey.

Seriously, one sensor is most likely for a gauge and the other is for an idiot light. My Cleveland only has one (in the block by the t-stat) but I built it from a shelled block and used aftermarket gauges.

Cheers,

Rick

Mpcoluv
Gearhead

Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001

posted 02-24-2004 09:06 AM     Click Here to See the Profile for Mpcoluv        Reply w/Quote
Some clevlands had a temperature "switch" for the distributor vacuum mounted on the water pump. This was used with the dual diagphram distributors.
I think you had one advance curve with the engine cold and one with the engine hot.
I just plugged that hole on mine.

joerigby5836
Journeyman

Posts: 54
From: FL
Registered: Feb 2004

posted 02-24-2004 09:47 AM     Click Here to See the Profile for joerigby5836        Reply w/Quote
Yes it does have the dual diagphram distributors and the port colsest to the cap is pluged. Do you know what that vacuum switch would be call if i were to look for one? I am trying to put this car back to its correctnes. 65% of the vacuum lines correct and others were pluged. The aftermarket vacuum diagrams are of no hely and not worth the money I had spent.
Thanks Joe

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Joe Rigby
1972 351c Mach 1 Fastback

Hemikiller
Gearhead

Posts: 726
From: Killingworth, CT
Registered: Feb 2002

posted 02-24-2004 12:22 PM     Click Here to See the Profile for Hemikiller        Reply w/Quote
It's called a thermostatic vacuum switch. If you need one, I probably have a couple extras kicking around....

joerigby5836
Journeyman

Posts: 54
From: FL
Registered: Feb 2004

posted 02-24-2004 02:07 PM     Click Here to See the Profile for joerigby5836        Reply w/Quote
First do I need some kind of wire to go to it? Or should I how does it work in conjuction with that sensor on the water pump?

Joe
[email protected]

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Joe Rigby
1972 351c Mach 1 Fastback

Jeff
Gearhead

Posts: 306
From: Moore, OK USA
Registered: Mar 2001

posted 02-24-2004 04:03 PM     Click Here to See the Profile for Jeff        Reply w/Quote
Distributors having dual vaccuum diaphragm vaccuum advance.

There are two lines; advance and retard:

The advance hose pulls the diaphragm (normal vaccuum advance schema) when connected to the carb's timed vaccuum port.

The retard hose is switched by the temperature switch such that vaccuum arrives only when temperature is up (warm engine). This connection serves to equalize pressure on both sides of the diaphragm hence retarding total advance. Source of vacuum can be raw vaccuum or timed vaccuum depending on how much retard is wanted.

joerigby5836
Journeyman

Posts: 54
From: FL
Registered: Feb 2004

posted 02-24-2004 04:32 PM     Click Here to See the Profile for joerigby5836        Reply w/Quote
thanks
I do understand what you have said about the vacuum lines. so i would guess on that vacuum switch there are electrical connection that one wire goes to the disconnected sensor on the water pump and maybe another to complete the electrical circuit?
Thanks
Joe

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Joe Rigby
1972 351c Mach 1 Fastback

RonnieT
Gearhead

Posts: 912
From: Port Allen, La. 70767
Registered: Jun 99

posted 02-25-2004 06:20 PM     Click Here to See the Profile for RonnieT        Reply w/Quote
Joe,
The two do not connect at all. The switch in the block has a wire connected to it that goes to the temp gauge. The Thermal vacuum switch has only vacuum hose connected, no wires. Look at a vacuum hose diagram for your year model and it will show you how tha hoses should be connected.

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Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

joerigby5836
Journeyman

Posts: 54
From: FL
Registered: Feb 2004

posted 02-25-2004 06:55 PM     Click Here to See the Profile for joerigby5836        Reply w/Quote
Thanks for your reply Ron
It appears that this has gone off track from my orginal question. which before your reply had left me with more questions since Jeff indicated my second sensor gets hooked up to that vacuum switch.
Another words I'm back to square one now.
Joe

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