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Unread 04-19-2014, 01:09 AM   #1
xcaliber81
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1994 ZJ 
 
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Exhaust manifold flange bolts or studs?

Just wondering whats there studs or bolts sorry I never checked, real question is if there bolts i should probably replace them right? are they special bolts or will grade 8 bolts work?

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Unread 04-19-2014, 06:22 AM   #2
firsttimeZJ13
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I went to autozone and bought exhaust bolts. Two of the old ones broke anyways. They come in a kit of 4.
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Unread 04-19-2014, 07:42 AM   #3
AVR2
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There are two studs (far left and far right of the manifold), the rest are bolts.
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Unread 04-19-2014, 08:01 AM   #4
OverlandZJ
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Flange at the downpipe?

IIRC theres one stud and one through bolt.
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Unread 04-19-2014, 08:40 AM   #5
Uniblurb
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Where the flange on the downpipe meets the outlet on the manifold they are showing 2 studs (J4007109) on the 94-96 ZJ parts list but they don't give thread size.
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Unread 04-19-2014, 10:00 AM   #6
xcaliber81
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Sorry yea where the downpipe meets the manifold. If they are studs are they replaceable?
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Unread 04-20-2014, 10:06 AM   #7
Uniblurb
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Would imagine you can since they sell the replacement studs. You'd probably have to put a whole lot of heat to the area around them to turn it red hot since they're designed like wheel studs as can be seen below.

http://www.ebay.com/itm/GENUINE-OEM-...-/261289895244

Another option is once you pound them out use the bolt/nut exhaust kit since you may have a more difficult time getting new studs installed.
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-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 04-21-2014, 09:46 PM   #8
RescueZJ
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I just undid the flange on my 95 4.0. The studs were not going anywhere... bolts came right off with impact gun. I lost one nut while putting them back on and could not find correct replacement nut size outside of dealer..lucky for me I finally found the nut later that day.
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Unread 04-21-2014, 10:45 PM   #9
xcaliber81
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Alright thanks guys. After 492000 kms should I be worried about an impact snapping the studs? haha.
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Unread 05-03-2014, 12:43 PM   #10
xcaliber81
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So I thought i'd let everyone know mine were bolts, sounds pimp with just the front downpipe btw lol.
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Unread 05-05-2014, 01:18 PM   #11
BLacher
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@xcaliber81 Make sure to soak them in PB Blaster or Kroil or comparable (NOT while hot) at least the night before removing.
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Unread 05-05-2014, 10:52 PM   #12
xcaliber81
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sprayed them with lloyds movit 25 mins before and was able to loosen them with a ratchet.
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Unread 05-06-2014, 06:25 AM   #13
BLacher
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Quote:
Originally Posted by xcaliber81 View Post
sprayed them with lloyds movit 25 mins before and was able to loosen them with a ratchet.
Excellent, I will have to check that stuff out. Never heard of it.
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