258 Crankcase Vacuum Fitting - JeepForum.com
 
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post #1 of 5 Old 07-23-2013, 07:56 AM Thread Starter
Hacken
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1987 YJ Wrangler 
 
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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.

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post #2 of 5 Old 07-23-2013, 08:22 AM
Old4X
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1990 CJ7 
 
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That is the CTO switch

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #3 of 5 Old 07-23-2013, 08:23 AM
roadyrob
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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.

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post #4 of 5 Old 07-23-2013, 08:30 AM
Old4X
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http://home.sprynet.com/~dale02/cto.htm

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #5 of 5 Old 07-23-2013, 08:35 AM
Old4X
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1990 CJ7 
 
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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.

418 miles on 19 gallons of gas. Can't beat the BBD !
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