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Old 03-18-2013, 11:01 AM   #1
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What are these for?

Received my WJ style manifolds in hopes of fixing the problem of my jeep cracking the conventional style headers. I got to looking at the cast iron manifolds and wondered what these bolt/plugs are for. Also it looks like there was a gasket material that is now dry rotted. Any advice how I can properly seal these up? I've tried looking for the small rings or gaskets and can't find them anywhere. Any input is appreciated. Thanks!
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Old 03-18-2013, 12:51 PM   #2
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O2 sensor for a different model?

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Old 03-18-2013, 01:04 PM   #3
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I suppose it could be. Either way I gotta find a way to properly seal them.
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Old 03-18-2013, 01:06 PM   #4
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those are the upstream O2 sensor ports for late model 4.0L's. they're plugged, so you're good to go. just use the O2 port on the Walker downpipe suggested before.

if there was a gasket in place, it would have been a thin metal crush washer. those are also used on O2 sensors and spark plugs. the size is 18mm, and they are readily available at any local auto parts store.

look inside the exhaust flange. if the threaded plug are is caked with carbon build up, it's never been pulled out and you're fine. if it doesn't look like the rest of the manifold wall, then you might think about a new crush washer.
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Old 03-18-2013, 01:10 PM   #5
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Alright thanks sir. The bolts themselves will provide a good enough plug though? There is a black gasket material under them that are rotted and broken up.
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Old 03-18-2013, 01:11 PM   #6
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Nvm just read the rest if your post. Had to refresh my app. Thanks!

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