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post #1 of (permalink) Old 08-21-2000, 12:05 PM
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intake manifold coolant

I have developed a leak where my intake bolts to the head. It had overheated before this started. Doesn't appear to be smoking, don't detect in water from looking at the dipstick, have not had chance to change oil and check it yet.

Just wanted to know the consequences of just plugging the coolant going to the intake, versus pulling everything and changing the gasket. Or maybe so other fix that I'm not aware of?

Kevin Low
84 CJ7
SE Michigan
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post #2 of (permalink) Old 08-21-2000, 09:30 PM
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Re: intake manifold coolant

I guess that means everything will be OK, go ahead and plug it all up???

Kevin Low
84 CJ7
SE Michigan
post #3 of (permalink) Old 08-21-2000, 09:44 PM
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Re: intake manifold coolant

personally i wouldnt plug it up....unless its really hurting performance.

i imagine that cooland passages to the manifold were put there for a reason. prob so th manifold didnt over heat and explode or something [img]/wwwthreads_images/icons/cool.gif[/img]

im not positve but i would recommend against it.....just my opinion

Jeep'n Greg
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2000 TJ 4.0L, jamboree edition
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post #4 of (permalink) Old 08-22-2000, 04:52 AM
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Re: intake manifold coolant

[img]/wwwthreads_images/icons/smile.gif[/img] On in-line engines there is a tendency for the venturi action of the carb at high RPM but LOW POWER settings to cause manifold icing. Manufacturers have used many different schemes to combat icing and warm the fuel mixture to the point where vaporization can occur. Exhaust heat has been one way, hot water is another, diverting the intake air to an exhaust-heated sleeve is yet another. You may experience icing on very cold days at low power settings where there is a tremendous pressure drop across the carb throttle plate if the hot water system is disconnected.[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #5 of (permalink) Old 08-22-2000, 10:06 AM
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Re: intake manifold coolant

I don't understand how it could leak where the intake bolts to the head. I just bought a new intake manifold Saturday which has the coolant flowing through it and there are no intake passages which flow between the head and the intake. There coolant flows into the front of the intake at the furthermost point from the head, below the air/fuel runners and out the rear of the intake. I would look for your coolant leak somewhere else and running to where the intake and head meet.

'75 CJ5,258,T18a,4.27's,33's,On-board air,Warn 8274
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