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Old 07-22-2015, 10:01 AM
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damn 0331 cracked head

I have known for a little while that I had a bad head do to a bad production batch of 0331 casted heads, I have a 2000 jeep grand Cherokee Laredo with a 4.0 which from what I understand has become the worst year for the bad heads, I wanted to know what I had to do so I could put a head from a 95 on it, from what I have read I would need the head gasket kit for a 95 and a down pipe for a 95 as well since the exhaust ports are slightly different would that be all that I would have to do? trying to get this done as cheap as possible.i also understand that the older head wont have the threaded holes for the coil pack but I am sure I can figure something out

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Old 07-22-2015, 12:23 PM
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Re: damn 0331 cracked head

What were the symptoms of the cracked head? White smoke out the tail pipe, or??
Mike Sal
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Old 07-22-2015, 01:03 PM
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Re: damn 0331 cracked head

Why go backwards to a 95 head? I'm not 100% sure, but I believe all the 03 and 04 WJ's with I6 had heads from a good casting lot. Why not swap up to a newer head that should be a direct replacement?
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Old 07-23-2015, 06:38 AM
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Re: damn 0331 cracked head

I had heard the 95 had the best air flow, I have considered using a newer head, there is no smoke and no thick emulsion in the valve cover but it was using small amounts of coolant over time so I pulled the valve cover and saw little green specks in a line in between cylinder 3 and 4 I put head gasket repair in it and stop loosing coolant for now. the purpose was to see if there really is going to be a difference going with a 95 head instead of a 2003 head
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Old 07-27-2015, 12:17 AM
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Re: damn 0331 cracked head

Okay, here's the thing on the 0331 head. Chrysler redesigned the head in '99 to increase the size of the intake/exhaust passages for better performance, BUT they made the walls between #3 and #4 too thin, resulting in cracks. They show up as either coolant in the oil or steam in the exhaust, or both. Chrysler denies they have a problem with these heads, stating they must have had poor maintenance or been overheated, HOWEVER the problem was resolved in the 2003 model year by recasting the head with different metal compounds. These new heads were stamped "TUPY" on the valve cover area
on the intake side. I just went thru this with my 2000 WJ. I went with a new heavy casting from Clearwater (Odessa) Cylinder Heads complete with valves for $455 including shipping both ways (core return). The new head is guaranteed not to crack for 5 years unless overheated. It is also designed to fit both the older and the newer blocks. My old head weighed 78 lbs while the new one was 85 lbs.
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Old 07-27-2015, 08:59 AM
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Re: damn 0331 cracked head

do you have a link for that head you bought, I would like to save up money and do the same things
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Old 07-27-2015, 12:09 PM
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Re: damn 0331 cracked head

I'd heard about the Clearwater head from another jeep forum and Googled (well, I used "bing") Clearwater Cylinder Heads and got their website. It turns out the actual company name is;

Odessa Cylinder Head
5100 Ulmerton Rd, Suite 2,
Clearwater, FL, 33760
727-299-9058

The part number is CHR238ZN, described as 6cyl, 4.0, 99-07, OHV, 0331 New Casting. Total price is $455 with an additional $100 if not returned within 30 days. I had to call them on the 30 day bit because I got delayed in returning it and they said they didn't even send a bill for 30 days after that. Funny thing is they ship it UPS Ground with a USPS return label classified as "scrap metal".

I got confused about which one to order from their website and called them, got a really nice guy to talk to, and was told I'd have it in 2 days because they have a warehouse here in NY!

There IS one little thing I must warn you about. The head is drilled for a rear temp sensor with a flush plug in it. This plug wasn't tight and was painted over which, of course, started leaking coolant 2 days later! I flipped out!! Watch for it. Make sure your gonads are protected when trying to install that head!
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Old 08-24-2015, 12:47 AM
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Re: damn 0331 cracked head

Can tell you from personal experience that any of liquid glass,Bars with copper particles is what I used will fix permanently that crack.
Military has used it forever and I have hot tanked and rebuilt diesel engine that were sealed with liquid glass.
Just drain all coolant and fill with water and a little dishwashing liquid and run for a day or so,flush and fill with clean water and sealant and drive for several days,repeat if nessary.
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Old 09-19-2015, 08:53 AM
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Re: damn 0331 cracked head

That may work, but Personally IDK if I would trust my engine bearings to a sealant. The military can afford to replace motors, I cannot.
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Old 09-19-2015, 03:06 PM
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Originally Posted by m880 View Post
Can tell you from personal experience that any of liquid glass,Bars with copper particles is what I used will fix permanently that crack.
Military has used it forever and I have hot tanked and rebuilt diesel engine that were sealed with liquid glass.
Just drain all coolant and fill with water and a little dishwashing liquid and run for a day or so,flush and fill with clean water and sealant and drive for several days,repeat if nessary.
Lol the army don't use bandaid products to fix a motor. We pull it and replace. I am an army mechanic and I've never used a block sealant like that. Even the TM's state to replace the engine if the conditions warrant it.
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Old 11-08-2015, 10:35 AM
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Re: damn 0331 cracked head

0331 has an accessory pulley mount hole that the 0630 doesn't. i think the temp sensor is in a different location also, but thats minor. do your homework. before swap.
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Old 11-20-2015, 11:47 PM
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Re: damn 0331 cracked head

I have a Clearwater Cylinder Head installed in my 2000 Jeep Grand Cherokee 4.0L in May 2012 at 51,187 miles. Today, I have 71,000 miles on it and I don't have any problems with thick-casting head. I drove my Jeep from Southern California to Denver/Greeley in Colorado and back last July. No problems whatsoever.
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