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Unread 03-31-2014, 02:34 PM   #1
ZGYJ
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1989 YJ Wrangler 
 
Join Date: Dec 2008
Location: Studio City
Posts: 72
Exhaust Manifold Reboot

I have an 89' Wrangler, straight 6. After years of exhaust and intake leaks I'm finally getting around to replacing the gaskets and upon further inspection, the exhaust manifold. It has numerous cracks in it, it sounds like a xylophone when you tap it.

You can the big one in the middle picture.

I ordered a new manifold through ebay. It's super cheap and I'm hoping it works. Nuff said about that.

It needs the manifold heater moved from the old to the new. Has anyone done this and what did they use to reattach it to the new manifold? I've included pics.

Also, as you can see from the new one there are bolts going into the exhaust runners on the new one, where there are only blanks on the old one. I'm assuming those are used for another model and don't think it'll take away from the performance. Not that my 4.2 has much in the way of performance.

But what I'm hoping for after this is better starting and less of the wrong kinds of noise.

Help is appreciated!

photo-3-3-.jpg

photo-2-3-.jpg

photo-1-3-.jpg

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Unread 03-31-2014, 02:40 PM   #2
YJ4LIFE
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1989 YJ Wrangler 
 
Join Date: Dec 2011
Location: , San Angeles
Posts: 747
i bought the same one off of rockauto. didn't use that heat through. went efi. I'd dremel those studs off and repaint that heat sheak with some high temp paint.
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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 03-31-2014, 04:49 PM   #3
ZGYJ
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1989 YJ Wrangler 
 
Join Date: Dec 2008
Location: Studio City
Posts: 72
Quote:
Originally Posted by YJ4LIFE View Post
i bought the same one off of rockauto. didn't use that heat through. went efi. I'd dremel those studs off and repaint that heat sheak with some high temp paint.
I can get it off, but what's the best way to reinstall? I'm in Cal and they like their smog-like-stuff where the factory put it.
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Unread 05-07-2014, 11:54 AM   #4
ZGYJ
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2008
Location: Studio City
Posts: 72
Quote:
Originally Posted by YJ4LIFE View Post
i bought the same one off of rockauto. didn't use that heat through. went efi. I'd dremel those studs off and repaint that heat sheak with some high temp paint.
Got that part done, but I have a question for ya'all... the gasket kit I got for the manifold has a metallic side and a cloth side, am I right to assume the metallic side goes toward the manifold? I would think it would be hotter than the motor.

Also, there are two gaskets for the exhaust... my manual says nothing about these. One is an O ring.. and another... suggestions are appreciated!
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Unread 05-07-2014, 01:49 PM   #5
dcocch
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1989 YJ Wrangler 
 
Join Date: Jan 2012
Location: Minneapolis, MN
Posts: 171
I am about 95% sure metallic side goes towards the exhaust manifold. I'd have to look when I get home though. I used the copper spray crap on mine. I have a 2.5L though so I can't help with the heater thing.
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exhaust , exhaust manifold , wrangler , YJ

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