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Unread 07-23-2013, 08:56 AM   #1
Hacken
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1987 YJ Wrangler 
 
Join Date: Sep 2012
Location: Thompsontown, PA
Posts: 16
258 Crankcase Vacuum Fitting

Can anyone Explain what this vacuum fitting is for and/or what it should be connected to? I have not found it in any vacuum diagram. It is located on the drivers side of the block just below the freeze plugs in front of the motor mount. I am going to try to up load the only picture of it i could find on line.

img_1563size-1.jpg  
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Unread 07-23-2013, 09:22 AM   #2
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,152
That is the CTO switch
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418 miles on 19 gallons of gas. Can't beat the BBD !
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Unread 07-23-2013, 09:23 AM   #3
roadyrob
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1987 YJ Wrangler 
 
Join Date: Apr 2007
Location: west palm beach fl
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how old is that motor? I'll take a WAG, it looks like a CTO port. your don't have one on your intake as it isn't water cooled so that must be it. can't tell you what it hooks to as mine is long gone.

late again! I've got to learn to type faster.
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Unread 07-23-2013, 09:30 AM   #4
Old4X
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1990 CJ7 
 
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http://home.sprynet.com/~dale02/cto.htm
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Unread 07-23-2013, 09:35 AM   #5
Old4X
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1990 CJ7 
 
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Location: Ga
Posts: 5,152
That is an ancient motor. That vac switch works like the CTO, but is for the choke heater IIRC. You have the old married style intake and exhaust manifolds and there is a heat exchange tube (that rusts out and causes a bad vac leak) that hooks to the hot air tube to the choke coil. That vac switch shuts off the heat once the engine is hot enough.

The elect choke cap replace all that junk.
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