Dec 10, 2010 – Recently I've read a number of threads about the dreaded .

7 posts - 6 authors - Last post: Oct 15, 2006head gasket, and mentioned that "sometimes these have a cracked head . . of the same problem on a more expensive XJ (it has the 0331 head). .

3 posts - 2 authors - Last post: Mar 10Mid 99 to 2002 4.0 engines had issues with the #0331 head casting cracking between the number 3 and 4 combution chambers, but most of them .

9 posts - 3 authors - Last post: Apr 14, 2010Also, the 2000 model year had a potential problem with the head cracking, do a search in the Cherokee under "0331" and you'll find threads .

10 posts - 5 authors - Last post: Feb 27, 2010Farna, Are u saying the 0331 head flows flows better at low lift only . Even recast to solve the cracking problem is there enough meat in .

5 posts - 4 authors - Last post: Jan 11That's a known problem with many of the 0331 head castings that were introduced in the '00 model 4.0L engines. .

20 posts - 15 authors - Last post: Jan 5That most likely has the "0331" stamped head. You may have read that all are prone to cracking, when it's really only the early build 0331 heads . . soft I had the problem on my 97 and have seen it on others as well. .

View Poll Results: Has your 0331 Head cracked? Cracked Head 47: 28.14%: No Problem 120: 71.86%: Voters: 167. You may not vote on this poll .

Jun 23, 2009 – I know of how the 2000-up have the #0331 cracked head issue .

6 posts - 5 authorsI used EA pro to sim the 99+ intake, the exhaust and the 0331 head as single mods . Sure, but the head has cracked on vehicles that haven't over heated. . Being a thinner cast, maybe the problem is aggravated in areas that have cold .

25 posts - 8 authors - Last post: Feb 26what years is that! that the xj 0331 head cracking . the indestructable 4.0L with head cracking problems Shocked - around the time they .

25 posts - 17 authors - Last post: Mar 7I hear they have a lot of problems with the transfer case going out? . . it's the 0331 head that is prone to cracking, however I don't . The 0331 head appeared on '00-'06 models though some '99's may also have it. .

21 posts - 9 authors - Last post: Jun 16I would say it's either a head gasket or cracked head. . . What is a 0331 .

39 posts - 28 authors - Last post: Nov 21, 2010That was the first year for the 0331 head which had casting problems which .

20 posts - 15 authors - Last post: Jan 5That most likely has the "0331" stamped head. You may have read that all are prone to cracking, when it's really only the early build 0331 heads . .. soft I had the problem on my 97 and have seen it on others as well. .

9 posts - 7 authors - Last post: Apr 24, 2010I think naxja overstates the 0331 head problem, lots of people pick up on . But even with one of my own 0331 heads cracking and all of the .

Apr 3, 2011 – Of course my Jeep has the crappy 0331 cylinder head and it . fixed this problem in 2002 or 2003, obviously it wasn't in 2002! . The old cracked head.. ..I used to have perfectly clean golden oil, now its milkshake! .

100+ posts - 46 authors - Last post: Mar 9head cracking issues with certain casting numbers in that year .

15 posts - 11 authors - Last post: Sep 16, 20080331 99+ (98+ on ZJ?) this head is prone to cracking in its . . They were looking at a class action suit and quietly addressed the problem. .

3 posts - 2 authors - Last post: Feb 20, 2009Has anyone else had this problem with 00-01 4.0L 0331 heads? .

15 posts - 10 authors - Last post: Apr 9Biggest potential problem I see right now would be the 0331 head (or is it .

21 posts - 9 authors - Last post: Jun 16What is a 0331 head casting and what problems arose? i have never run across this . I would at least take a look to see if it is cracked. .

An 0331 Head Cracked, . Cylinder Head. Crevices On 1999- 2004 Chrysler/Jeep. . .. Contract Problems and Credit ratings Spread Determinants with the . .

8 posts - 7 authors - Last post: Feb 14, 2007To my suprise the dealer told me the cylinder head was cracked and it . Has anyone ever had this problem? The service foreman told me he sees . 0331 ( right above the manifold) is notorious for cracking in between the .

100+ posts - 16 authors - Last post: Jan 29no need to bet that will be a 0331 head, but even worse 99-01 were THE WORSE . . Only problem Is if its cracked it may not be repairable. .

. in his yard fsj: 4.0L head 0331 cracks (fwd) RE: fsj: 4.0L head 0331 cracks . manufacturers actually fixed the head cracking problem sometime in 2001. .

39 posts - 28 authors - Last post: Nov 21, 2010That was the first year for the 0331 head which had casting problems which makes them almost always crack and have to be replaced. .

The flathead, however, was prone to the typical flathead problem of overheating under . hot (the first sign of a blown head gasket) and thus warping or cracking the head. . .. This head was designated as "0331" in the casting number. .

15 posts - 13 authors - Last post: Aug 7, 2009The head was definately cracked. I yanked the head last week and found .

8 posts - 4 authors - Last post: Nov 29, 2004It turns out that the engine head is cracked and the coolent has been .

20 posts - 10 authors - Last post: Apr 8, 2006Cracked 0331 cylinder head castings Cherokee/Comanche Forum. . I'd like to compile a database of Jeeps affected by head cracking problems. .

Jul 21, 2011 – This will help, it will not FIX the HOT SOAK problem. . time they knew of the cracking issue with the 0331 head and the Cherokee was being .

Mar 10, 2011 – I had originally suspected my 0331 head may be cracked .

Jun 4, 2011 – Biggest potential problem I see right now would be the 0331 head (or is it 0311, I always forget?) and associated potential for cracking. .

7 posts - 4 authors - Last post: Mar 30, 2007. and while I haven't yet encountered a cracking problem, . I have decided to buy a used late model 0331 head and remove it from the .

40 posts - 16 authors - Last post: Jul 13, 2010Google 0331 head. Common problem in the 1999 and newer 4.0 Jeeps. . . I believe the head cracking issues were largely rectified by '03. .

26 posts - 22 authors - Last post: Feb 1I realize every older car will have problems but I've got class 3 days a week, . The 00 and 01 did have a head cracking issue. Because of a bad casting just google it 0331 head and you will find all you want on it. .

15 posts - 11 authors - Last post: Mar 13, 20100331 Head - The Ticking Time Bomb? OEM Tech Discussion. . new springs and valves - reinforced in the area that is prone to cracking. . .. I've been reading posts on the '"0331 problem" ever since I found out about it. .

9 posts - 7 authors - Last post: Feb 3, 2009I wouldn't worry about that head until you start seeing problems. . ok my head recently cracked. 0331. it cracked somewhere between 85k .

1 post - 1 author - Last post: Jul 12000 Cherokee Sport, 4.0 I am pretty sure that my head is cracked, and I'm pretty sure that it is the "infamous 0331". The head is the OEM. . My question is: Since it is known that it's a problem head. would it be good .

15 posts - 10 authors - Last post: Apr 9Biggest potential problem I see right now would be the 0331 head (or is it 0311, I always forget?) and associated potential for cracking. .

Jan 28, 2011 – I had that exact problem with my XJ. For me it was the .

May 2, 2009 – About a chronic problem with the 0331 cylinder head cracking. I don't know yet if I'm losing coolant (haven't driven it enough), but the oil .

15 posts - 10 authors - Last post: Feb 100331 head change results OEM Tech Discussion. . Well the 98 has head issues , either bad head gasket or cracked head, low compression in 3 cylinders and 201000 . Bolted right up no problems, and is running great! .

3 posts - 2 authors - Last post: Feb 20, 2009May have a cracked 0331 head. Has anyone else had this problem with 00-01 4.0L 0331 heads? I have been having a missing coolent issue for a .

2 posts - 2 authors - Last post: Apr 19If you have any other problems with the registration process or your account . All WJs have the 0331 head, which is prone to cracking. .

15 posts - 7 authors - Last post: Feb 3, 2009Possible 0331 Cracked Head ? Modified Tech Discussion. . than that it ran perfectly fine and you wouldn't have known it had a problem. .

10 posts - 3 authors - Last post: Feb 4I recall the new head is the 0331 casting, revised to avoid its cracking problems. If $100-200 is a critical issue, you should be able to .

Jan 13, 2010 – Is there some problem with the 0331 head? . The head is prone to cracking between number 3 and 4 cylinders. The 0630 head that was used .

21 posts - 9 authors - Last post: Jun 16Odds are a cracked head. Pull a spark plug out, one at a time, .

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