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Unread 10-23-2010, 01:06 PM   #1
Kevin108
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10w40 milkshake, now what?

I overheated from a hole in the radiator a couple weeks ago. It went from 210 to ludicrous heat in about 2 minutes and cut off. I replaced the radiator, cap and thermostat and hoped for the best.

I don't do a lot of driving, usually just back and forth to work - about 2 miles at a time. I noticed Friday morning that I was running a little warm. When I got home, I topped off the radiator just to see how much water it would take. About 2 quarts.

Where did my water go? Then I checked the oil. Oh, there it is!

I'm hoping its just the head gasket but I do have the beloved 0331 head. My mood was lifted earlier when I remembered that I'm only going to have to pull 1 head instead of 2. I'm using to wrenching on rigs with V8s so this is only going to be half as much work as I was expecting!

I have access to pretty much any tool you can imagine. Dad is a retired professional mechanic with a full setup at home. He knows how to do all this stuff but I want to do my homework and be on the same page with him and his thought process when we attack this so I can actually work with him and this not be a teaching session.

How do I determine whether it's a cracked head or just the gasket?

Is it even possible to know without pulling it?

Are there any tricks to pulling the head?

What year can I swap a non-0331 head from?

Does it have to come from an XJ or does a ZJ/WJ/WTF ever have a compatible head?

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Unread 10-23-2010, 01:13 PM   #2
ChicoXJ
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You just have to get the head off to determine what it is. If the gasket is not stuck to a surface, usually in the rear where it gets hottest, that is the clue the gasket failed. But the head itself you have to take it in to an automotive machine shop to be sure, unless of course you can visibly see a crack.
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Unread 10-23-2010, 01:14 PM   #3
keepishop
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If you take the valve cover off you should be able to see the weak spot and the crack.

Search 0331 head for more information.
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Unread 10-23-2010, 02:07 PM   #4
tjwalker
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The 0331 head almost always cracks between cylinders 3-4, where there is a casting defect. Most of the time, these cracks can be pretty easily seen if you remove the valve cover.

Your options for a new head are a 2003 or newer Jeep 0331 TUPY head (redesigned from what you have) or a replacement head from Clearwater Cylinder Head, Alabama Cylinder Head or the like.

You can use an earlier head but a little bit of garage engineering is needed. I have heard no complaints about Clearwater/Alabama and I would probably lean towards that route.
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Unread 10-23-2010, 02:58 PM   #5
Kevin108
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Thanks guys. This sounds like all I need to start things off. I'll check back in tomorrow when I get over to my parents' house and have some solid info.
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Unread 10-24-2010, 03:52 PM   #6
Kevin108
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I'm officially another victim of the 0331 head. Pics later.

What are my options for a donor source? 02-04 WJ and 02 TJ?
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Unread 10-24-2010, 04:02 PM   #7
ChicoXJ
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If you use a 98 and down HO head, you will gain some horsepower and not be prone to cracking.
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Unread 10-24-2010, 04:30 PM   #8
Kevin108
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I like horsepower. Tell me more!
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Unread 10-24-2010, 04:36 PM   #9
FairlanePhil
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Now go post in that reliability thread
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Unread 10-24-2010, 05:10 PM   #10
Kevin108
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Weeping from a hairline crack at cylinder 4. 0331 FTL!

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Unread 10-24-2010, 05:11 PM   #11
tjwalker
It's the crank sensor!
 
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Another 0331 bites the dust. Add it to the pile, which grows every day........

Kevin, what are your plans?
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Unread 10-24-2010, 05:18 PM   #12
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I'll put another head on it. I'm back in my 87 Silverado so having transportation, I have the luxury of being able to shop for the best price. Dad's making some calls, I'm making some clicks, we'll come up with something. I just need to figure out which heads I can actually use.

What I haven't decided is whether or not I'll sell it after I fix it. I've spent more time working on it than I have enjoying it. In the year I've owned it: AC repair, new battery, new starter, new radiator, new crank position sensor, reindexed the camshaft position sensor, lots of other odds and ends and now a new head. If I wasn't doing all the work myself, I'd have 50% of what I paid for it in repairs. I love the community and my club. I love the mix of comfort and capabilities. But I'm kind of over feeding a steady stream of parts to a stock rig.
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Unread 10-24-2010, 06:08 PM   #13
FairlanePhil
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I dunno man, your almost done rebuilding it. (I'm in the same boat)
I went past the point of no return this weekend and put in my SYE
even though I know I have a rod knock or a busted piston skirt.
I am going to build the best recipient for a new reman 4.0 I can.
When it finally grenades or I get an 0331 crack I won't mind spending the big dollar.

I blow thru cars like crazy. So far this dumpster fits
my family/lifestyle better than most cars I have DD'd
It hauls crap like I need it to, should do well in snow and is less gay than a minivan.
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Unread 10-24-2010, 06:17 PM   #14
ChicoXJ
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Quote:
Originally Posted by Kevin108 View Post
I like horsepower. Tell me more!
One of the popular horsepower upgrades is to use the 99-00 intake manifold which of course you already have. It flows much more air. In order to meet emissions Chrysler had to restrict the 0-331 head, and then increase flow in the manifold to keep the horsepower the same. So, if you get rid of the crack prone 0331 head and go to the original HO head, you will then gain flow in the head and the HP that goes with it. Here is a very good write up on the swap and verifiable gains that came with it.

http://www.mallcrawlin.com/forum/showthread.php?t=6355
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Unread 10-24-2010, 07:10 PM   #15
Kevin108
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Quote:
Originally Posted by FairlanePhil View Post
I dunno man, your almost done rebuilding it. (I'm in the same boat) I went past the point of no return this weekend and put in my SYE even though I know I have a rod knock or a busted piston skirt. I am going to build the best recipient for a new reman 4.0 I can. When it finally grenades or I get an 0331 crack I won't mind spending the big dollar.

I blow thru cars like crazy. So far this dumpster fits my family/lifestyle better than most cars I have DD'd It hauls crap like I need it to, should do well in snow and is less gay than a minivan.
I'm just aggravated with it. But you're right. The peace of mind that will come with a non-0331 head will likely keep me pushing forward with my ownership. I really want some armor and a bump up to 31s at some point but the damn basics are killing my budget.

Before I bought my XJ, I thought long and hard about what I needed my DD to do, how much I wanted to spend, etc. I gave myself a budget of $10,000 and after checking into 4-Runners and X-Terras, I looked at some TJs. That led me over the to XJ, which had basically the same drivetrain but was somewhere around $6,000 less, could tow more, was actually comfortable for 4 people and had secure cargo space.

Despite my current distaste for my Heep, if it will just ****ing run, it's exactly what I need.

Quote:
Originally Posted by ChicoXJ View Post
One of the popular horsepower upgrades is to use the 99-00 intake manifold which of course you already have. It flows much more air. In order to meet emissions Chrysler had to restrict the 0-331 head, and then increase flow in the manifold to keep the horsepower the same. So, if you get rid of the crack prone 0331 head and go to the original HO head, you will then gain flow in the head and the HP that goes with it. Here is a very good write up on the swap and verifiable gains that came with it.

4.0L 99+ intake manifold swap with REAL DYNO NUMBERS! - MallCrawlin.com Forums
One of my club members has a full engine for sale out of a 92 YJ. Can I use that head?
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