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Old 07-16-2013, 03:20 PM   #1
wasomma's Avatar
Join Date: Aug 2010
Location: Baltimore, MD
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Manifold tightening sequence question

I have a 95 YJ 4.0L and noticed a smell of exhaust about a week after I replaced my exhaust manifold. Went in and tightened the bolts back down and a couple days later I started to smell the exhaust once again. I think my sequence is wrong for tightening the bolts and after a little research came across this bad boy:

I think it is a diagram for a 4.0L out of a TJ but does it apply to the YJ as well or is there another sequence I should be using? I came across some other diagrams but they all have the EGR tube listed which my 4.0 obviously doesn't have.

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Old 07-16-2013, 03:44 PM   #2
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Location: SoCal
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That diagram is probably just fine. But if you tightened the manifold the first time and was good. Drive it and had to tighten it a second time, and now you smell it again? Are the nuts loose again? You might need to buy new hardware and a new gasket.

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Old 07-17-2013, 01:59 AM   #3
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Location: Baltimore, MD
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I still have to check the bolts to see if they are loose, I suspect because I put anti seize on there it may have not helped my case. Also if I suspect if the tightening sequence was wrong that may have also caused my issue, I'll check on thursday and see if they are loose.
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Old 07-17-2013, 07:46 AM   #4
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Join Date: Jul 2012
Location: JAX, FL
Posts: 635
Use the diagram and get rid of the antiseize. It isnt unusual to have to retighten after a few hot/cold cycles. Aftermarket headers are really bad for this and its good practice to check all exhaust fasteners.
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