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Unread 10-19-2009, 05:21 PM   #1
CarolinaAndy
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exhaust still getting really hot!!!

Hi. I posted a week ago about my exhaust mans getting up to 500 degrees and causing a "hard start while hot" condition (carb getting too hot as well). I checked timing and it was at 8 deg which is spec for the 232. I was told somthing about an exhaust riser? no idea what i'm doing i guess.

What do I look for? could a gasket leak cause an overheat of the manifold? HELP!!!!
-Andy

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Unread 10-19-2009, 05:22 PM   #2
CarolinaAndy
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is there a better source on the 232 than this sh!tty Hanes manual?
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Unread 10-19-2009, 05:27 PM   #3
scottymac62
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Quote:
Originally Posted by CarolinaAndy View Post
is there a better source on the 232 than this sh!tty Hanes manual?
Yes, It's called the Jeep CJ FSM.
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Unread 10-20-2009, 10:38 AM   #4
CJhollic
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How are you determining that your manifold and carb are getting too hot? Are you sure you dont have a dragging starter?
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Unread 10-20-2009, 05:57 PM   #5
CarolinaAndy
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I'm using a temp gun and scanning the whole motor for hot spots. and it starts up like a champ unless I run it for a long while and shut it off for about 20 minutes.
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Unread 10-21-2009, 02:18 PM   #6
CJhollic
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I supect you problem is probably a bad starter, bad battery are defective wiring.
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Unread 10-21-2009, 09:00 PM   #7
CarolinaAndy
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the motor turns over fine though. It will just keep cranking without firing off.
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Unread 10-21-2009, 09:20 PM   #8
popascj7
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Have you done a compression test on it when it's hot?
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Unread 10-22-2009, 11:34 AM   #9
CJhollic
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sorry, I thought you meant it was turning over slowly.
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Cold Air Intake
Lock-Right Lockers
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Unread 10-22-2009, 11:46 AM   #10
Mike Romain
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Well vapor lock after a hot shutdown is the reason they started putting the return lines and two outlet filters on them. If you have the proper filter and return line, make sure the return is at the top of the level sitting filter or the gas will blow back to the tank.
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Unread 10-22-2009, 08:22 PM   #11
CarolinaAndy
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There is an adaptor plate that the webber carb sits on that has a pinched off line coming out of it. Is that supposed to be the line to prevent vapor lock?
[IMG]C:\Users\Oberdier PC\Pictures\2009-10-14[/IMG]
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Unread 10-22-2009, 08:26 PM   #12
CarolinaAndy
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[IMG]C:\Users\Oberdier PC\Pictures\2009-10-14\020.JPG[/IMG]
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Unread 10-23-2009, 06:38 AM   #13
John Strenk
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Quote:
Originally Posted by CarolinaAndy View Post
There is an adaptor plate that the webber carb sits on that has a pinched off line coming out of it. Is that supposed to be the line to prevent vapor lock?
[IMG]C:\Users\Oberdier PC\Pictures\2009-10-14[/IMG]
You will have to use the "manage picture option" to upload that picture off your hard drive or put it someplace on the internet picture site for us to see the picture.

Are all your cylinders firing? sometimes a cylinder will be dead and the fuel and air mixture will get pumped into the exhaust and start to burn there.
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Unread 10-23-2009, 07:50 AM   #14
Mike Romain
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As John mentions, use photobucket or something to store your photos and post the img link here,

The gas filter is the return. It has two outlets, the center outlet goes to the carb and the top metered outlet goes to the return line,

Weber eh.... Well there are some nasty 'weber' clones out there like the '34' that run way too rich as they come and also run way too rich without a fuel pressure regulator on them. They need new jets and a regulator to run if you are lucky. This 'gent' fred wrote a paper worthy of a doctorate thesis on making one work: http://www.jeepforum.com/forum/f8/we...-258-a-631105/

Maybe that will be of use to you?
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 10-23-2009, 08:10 AM   #15
algmmech
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500 degrees is not too hot at an exhaust manifold. I've seen AIR systems bring temps above 900. I didn't read you other post, what I know so far is the engine cranks over fine when hot, but takes a long time before it actually starts. May be vapor lock, caused by a sticking heat riser. The heat riser is in the lower part of the exhaust manifold, just above where the exhaust pipe bolts on. The heat riser is a valve that has a counter weight and bi-metallic spring. When the spring heats or cools it will allow the valve to open or close. The valve will restrict exhaust in the manifold when cold to help keep the carb from freezing. Make sure you can rotate it, it should turn about 90*.

Now it may not be vapor lock. Is there anything you do than helps it start, like pumping the gas pedal or holding it to the floor. Have you checked spark? After shutting off the hot engine, look down the throttle bore, is fuel running out the venturi nozzle? Is the choke open fully? How long of cooling does it need to make it easier to start.

Give us as much information as possible, Once again 500* is not too hot. You may or may not be on the right track with the vapor lock theory.
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