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Old 07-16-2014, 01:27 PM   #1
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On a scale of 1 to 10 how hard is it to replace the exhaust manifold on an 4.2L 87 YJ. I am still a mechanical newb but I am learning. I just don't want to bite off more than I ca. Chew. I just can't afford $750 to have shop replace it. Thank you in Advance.

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Old 07-16-2014, 02:07 PM   #2
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I would say it s probably a strong 6 or weak 7.

Its not hard to do at all as long as all of the bolts come out. If you snap any of them off then the hardness factor climbs.

Probably why the shop has that high of a price on it. That and the fact that its not a quick 1hr job. I am far from a newbie as far as mechanics goes, and I did my own a few years ago and it took me about 4.5hrs of total actual wrench time to make the replacement.

The bolts that hold the exhaust manifold on, also hold the intake manifold on, so you have to remove the intake and all of its extras in order to get to the exhaust manifold.

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Old 07-16-2014, 06:48 PM   #3
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Wow!? You guys have given me something to look forward too.....Not!

I've gotta do mine in a few weeks. I was thinking, if I could just back the bolts out, pull the manifolds back, slip the old gasket(s) out, slip the new one(s) in.....and BINGO - you're done!

Mean, it's not that easy. Lol
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Old 07-16-2014, 08:13 PM   #4
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I would say it s probably a strong 6 or weak 7. Its not hard to do at all as long as all of the bolts come out. If you snap any of them off then the hardness factor climbs. Probably why the shop has that high of a price on it. That and the fact that its not a quick 1hr job. I am far from a newbie as far as mechanics goes, and I did my own a few years ago and it took me about 4.5hrs of total actual wrench time to make the replacement. The bolts that hold the exhaust manifold on, also hold the intake manifold on, so you have to remove the intake and all of its extras in order to get to the exhaust manifold.
Thank you, not what I wanted to hear but just the kind of information I needed.
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Old 07-17-2014, 01:16 AM   #5
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OIIIO is Right it's not a walk in the park, but it is a doable job, just park it for three or four days and soak it real good to get the nuts loose, then take you time and you can do the job your self. I would not pay $750 for the job, maybe $250 if I didn't work on my own stuff but not $750.
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Old 07-17-2014, 03:31 AM   #6
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I will also need to buy new bolts besides the obvious gasket right? Anything else?
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Old 07-17-2014, 05:28 AM   #7
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get a exhaust manifold stud kitstud kit when you replace it....if that will work with factory exhaust manifold....that what i did. ive had to remove my header and intake once after initial instal....SSSOOOOOO much easier
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Old 07-17-2014, 06:16 AM   #8
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I would say it s probably a strong 6 or weak 7.

Its not hard to do at all as long as all of the bolts come out. If you snap any of them off then the hardness factor climbs.

Climbs exponentially!

If there is an EGR, that adds to the PITA factor. MY 2.5 has power steering, and the bracket was in the way and a real bear to remove. I think the steering in mine was an afterthought, and the bracket is homemade. couldn't get the EGR bolts off with the bracket on, couldn't get the bracket off without removing the engine mount!

I took the easy way....I cut the EGR pipe. Welded it back together after installing everything. Make sure there is no gas around if you go this route.

Clean the threads in the head with a tap when you have everything out or if you have studs, run a die over them....makes life easier to obtain correct torque.

Have fun.....save the &750 for beer!
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Old 07-17-2014, 06:43 AM   #9
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When I did my exhaust manifold the end studs were already snapped off. So I drilled one out and used an easy out to remove the stud , the rear stud I couldn't get a drill on it straight so I had to remove the head but when I went to remove the head the front left head bolt snapped off. It seems someone had the head off and didn't use sealer on the bolt so it rusted in the block. I have done this type of work for 35 years and you learn to expect things like that when you price a job so you price it accordingly.
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Old 07-17-2014, 09:11 PM   #10
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Thank you all for the valuable input.
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Old 07-17-2014, 09:36 PM   #11
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Here is a great write up. I used it last year and I had never done any mechanic work before...

How-to: Replace your cracked exhaust manifold - JeepForum.com
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Old 07-17-2014, 10:49 PM   #12
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Here is a great write up. I used it last year and I had never done any mechanic work before... How-to: Replace your cracked exhaust manifold - JeepForum.com
This looks like it is for the 4.0L YJ would it be similar for the 4.2?
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Old 07-18-2014, 02:28 PM   #13
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Very similar, the only difference is a 4.0L is MPI injection and the 4.2L has a carburetor. But the sequence on doing the intake and exhaust manifolds are basically the same.

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