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Unread 12-09-2011, 07:26 PM   #1
Samick
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2001 4.0 cylinder head crack. best fix?

So i got the good ol' cylinder head crack between cylinders 3-4 on my 01 4.0 wrangler. i was wondering what the best fix is to keep this from happening again. is there a after market cylinder head i can buy thats less prone to this? i thought i read that the older heads wont bolt up to the new blocks for various reasons.

any advice would be much appreciated

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Unread 12-09-2011, 07:29 PM   #2
Molonlabemike
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Quote:
Originally Posted by Samick View Post
So i got the good ol' cylinder head crack between cylinders 3-4 on my 01 4.0 wrangler. i was wondering what the best fix is to keep this from happening again. is there a after market cylinder head i can buy thats less prone to this? i thought i read that the older heads wont bolt up to the new blocks for various reasons.

any advice would be much appreciated
A two piece header with flex joints seam to hold up pretty well.
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Unread 12-09-2011, 07:32 PM   #3
99TJSahara
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Originally Posted by Molonlabemike View Post
A two piece header with flex joints seam to hold up pretty well.
He's talking about a cylinder head, not an exhaust header.
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Unread 12-09-2011, 07:35 PM   #4
CJ7-Tim
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An older 0630 or 7120 head will bolt up to the block, but you will have to make exhaust manifold modifications and fabricate some sort of bracket for your spark plug rail. Search JeepForum or use the Google, these mods are discussed and detailed on many Jeep owners forums.

The best, cheapest, easiest fix is a 2003 and newer TUPY 0331 head from the junkyard. They are the revised heads that do not crack.

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0331-tupy.jpg  
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Unread 12-09-2011, 08:10 PM   #5
Samick
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any idea what tupy stands for? thats exactly the kind of information i was hoping to find!!!

i see the picture, but where does it say it? between ALL of the rocker arms? if i told a guy at the jeep parts desk i need a tupy 0331, would he know what i'm talking about?
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Unread 12-10-2011, 02:31 PM   #6
Samick
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bump. would like some more input on this.
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Unread 12-10-2011, 03:01 PM   #7
CJ7-Tim
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Originally Posted by Samick View Post
... if i told a guy at the jeep parts desk i need a TUPY 0331, would he know what i'm talking about?
Probably not. Just tell them you have an 04 TJ and inspect the head for TUPY before you buy it. Any 2002 or 2003 and newer 4.0L head that fits your engine should be TUPY. 0331 and TUPY are between the 3 and 4 cylinders.
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Unread 12-10-2011, 04:25 PM   #8
gremlinsteve
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just buy the head from alabama cyl heads. revised with a thicker deck. good head.

steve
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Unread 12-10-2011, 10:28 PM   #9
herbiehind
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Originally Posted by gremlinsteve View Post
just buy the head from alabama cyl heads. Revised with a thicker deck. Good head.

Steve
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Unread 04-17-2013, 08:18 AM   #10
rmxauto
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What TUPY means

Quote:
Originally Posted by Samick View Post
any idea what tupy stands for? thats exactly the kind of information i was hoping to find!!!

i see the picture, but where does it say it? between ALL of the rocker arms? if i told a guy at the jeep parts desk i need a tupy 0331, would he know what i'm talking about?
TUPY is the name of the foundry in Brazil or some latin american country where the revised, non-cracky 0331 casting heads are produced for Chrysler.
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Unread 04-20-2013, 09:32 PM   #11
laybackman
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Here is what I went through;

http://www.jeepforum.com/forum/f19/c...dence-1306393/
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