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Old 04-23-2011, 06:16 PM   #1
Join Date: Sep 2010
Posts: 73
Exhaust Bolts To Manifold

1990 YJ, 2.5L AX5

Removed my old exhaust as it was all rusted through and sheared the bolts connecting the exhaust pipe to the exhaust manifold. Are those bolts or are they threaded into the coupling there?

They're obviously rusted to hell, and I need to remove them to replace my exhaust.

Any recomendations on a full exhaust replacement?

Also, are Bosch Plantinum+2 Spark Plugs good or should I just use the stock type ones?

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Old 04-23-2011, 06:52 PM   #2
redsoxfan25401's Avatar
Join Date: Feb 2011
Location: Martinsburg,wv
Posts: 115
Can't comment on the exhaust but the Bosch plugs I can I used them and hated them Jeep ran funny with them installed changed them out went to a autolite plug and everything is fine now

Don't worry it's JEEP it's supposed to make wierd noises
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Old 04-23-2011, 07:25 PM   #3
90-YJ of CT's Avatar
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Location: Windsor, CT
Posts: 45
Exhaust manifold & intake use bolts into the head. There are alignment dowels. Make sure to get all the bolts started and gasket in place before snugging them down (then torque in proper sequence). If exhaust pipe is tweaked you may want to disconnect at the manifold so the gasket seats properly. Otherwise you may be repeating gasket replacement too soon.

I concur that standard spark plugs work fine with a stock engine. JMO.
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Old 04-23-2011, 07:48 PM   #4
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Location: San Antonio, Tx.
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The exhaust pipe bolts onto the exhaust manifold. They must really be rusted on there. I have to use 2 wrenches to get mine off. If I'm not mistaken, it's a 9/16" bolt head. Spray them down with some WD. As for the plugs, I've ran the Bosch platinums in the past and didn't notice any problems. I have however seen a lot of other posts where people said they weren't good on their Wranglers.
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Old 04-23-2011, 07:58 PM   #5
90-YJ of CT's Avatar
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Location: Windsor, CT
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My bad. Thought you meant into head. Manifold on mine had studs that were pressed into flange, got wrecked in disassembly. Replaced with standard bolts.
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Old 04-23-2011, 08:30 PM   #6
Join Date: Sep 2010
Posts: 73
Damn, yea mine aren't spinning at all, rusted in there solid.

Anyone have a recommendation on a full new exhaust system?
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Old 04-23-2011, 10:45 PM   #7
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Location: Spokane, WA
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My son just snapped his bolts trying to drop exhaust to pull tranny for a clutch slave replacement. The bolts are threaded into manifold and it cost him $50 to have exhaust shop fix it. The guy at the exhaust shop told us not to ever undo from there because they usaully break from all of the heat. He said next time just cut pipe below that and stick a coupler in to get it to muffler shop. He said that most places will just charge you $5 to weld coupler, and that sure beats paying $50.
Sorry I dont have any recommendations for exhaust, other then I have heard that a couple people have been pulled over recently for not having tailpipe all the way back to rear.
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Old 04-24-2011, 12:42 AM   #8
Join Date: Mar 2011
Location: Lake Ronkonkoma, NY
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As for the exhaust, i had the same exact problem a few months ago, if your talking about the two studs that are in a flange on the manifold that hold the front exhaust pipe. I ended up trying to get it off and the stud snapped so i had to take off my exhaust and intake manifold to put it on the drill press to remove what was left of the stud and place a helicoil in its place (its held up really good so far), with new stainless steel hardware from a local hardware store. The first thing i suggest is to get PB blaster and spray everywhere around the threading where the stud is and let it sit for a little while. then spray it a couple more times letting it sit and soak into the threads. I used a Stud/bolt Remover kit that i had in my toolbox to remove the other stud after it was soaked in PB blaster. It might also help to use a breaker bar on your ratchet to get more torque out of the ratchet.your going to want to replace your studs with stainless steel because you to wanna avoid all rust if you have to do work again in the future. to replace my exhaust, i picked up a walker front pipe, Dynomax Cat, Stock muffler, walker tail pipe from my local parts store. If you have to remove the manifold replace the gasket if you haven't already and also coat the threads with Anti-Seize compound to prevent stuck bolts.

1987 YJ, 4.2L I6, Weber carb, 4in. RC lift, 33x12.5x15 BFG KM2's, 15x8 Cragar soft 8's, custom steering box skid, and more
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