1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

antifreeze leak question.

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Old Feb 13, 2010 | 12:35 PM
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85rx7crazydriver's Avatar
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From: harrison, ar
Question antifreeze leak question.

hello, what is the problem called when you have antifreeze leaking out from around the intake manifold? and how hard is it to fix? thanks!
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Old Feb 13, 2010 | 12:42 PM
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well you have to pull it off, and change the two rubber O rings. take the used O ring to the auto parts store and get to new ones. the one at the auto parts store are a little bigger but will work just fine.
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Old Feb 13, 2010 | 01:02 PM
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From: harrison, ar
cool, thanks!
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Old Feb 15, 2010 | 04:54 AM
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the o-rings are in place because coolant runs through the intake manifold for accelerated warmup.
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Old Feb 15, 2010 | 11:44 AM
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You can circumnavigate having any sort of issues with those pesky O-rings by picking up 2 20mm freeze plugs from your auto parts store.
Just gently yet firmly drive them flush into the end of the water passage, and WALLAH!! no more coolant in your intake.... I still replace to O-rings just as a double measure it ensure there are no leaks.....
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Old Feb 15, 2010 | 02:11 PM
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If you do decide to block coolant flow, you must also block the ACV port. If you don't, hot exhaust will heat up your manifold. It's a little rectangular port below the two intermediate ports. I like Quicksteel in the engine side because you can swap to any manifold, even the '79 style. Otherwise the manifold side is a little easier to deal with. You must clean the metal really well because of carbon and oil deposits.
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