Jeep 0331 head cracking

You cant choose a material that could evaporate from the supply chain. I bought the jeep about 3 years ago, and about a year ago coolant started leaking into the oil. This head has the mounting bosses for the ignition coils. A friend of mine has another head i can get very cheap. Head rebuilder only had an 0331 head, which he said was a direct replacement. As youve probably learned by now, the reason wasnt how i treated the engine, it was just that sometime in 2000 the head and exhaust were updated to the 0331 design and well its just a bad head casting design that has a high probability of developing a crack that. Good shape, no cracks or warped heads, pulled from a running and driving late jeep wrangler tj. Comes with a one year parts and labor warranty so buy with confidence.

The 2000 jeep cherokee has 15 nhtsa complaints for the engine and. In 2002 they contracted with tupy manufacturing in brazil to remake the head. Apparently a lot of diagnostics wont show a small crack like this, and apparently some 99s have the 0331 head. Promaxx performance oereplacement jeep inline cylinder heads offer direct bolton power. Chrysler wont admit that its a problem, and alot the newer model 4. A cracked cylinder head, bad head gasket, or bent valve in your jeep can cause loss of power or altogether prevent the engine from running. Hi everyone, ive searched for this and havent really found any good answer. Its pretty easy, but if you are all thumbs you might want some help. Jeep just overheated the other day on the way home from work 34miles. Year models between 2000 and 2001 which used the 0331 cylinder head were prone to cylinder head cracking and oil leaks. My opinion is that like the 0331 head casting flaw, it is a casting flaw in the piston. Rockauto ships auto parts and body parts from over 300 manufacturers to customers doors worldwide, all at warehouse prices. Lack of good cooling system maintenance can contribute to the fail and an overheat of the engine increases the odds of head failure dramatically. If youve found your way here, then you probably already have a cracked 0331 head in your jeep or you are thinking about a preemptive replacement.

Just been reading about the common problem of a cracked head on early tjs with the 4. I have no symptoms of a cracked head but i am somewhat paranoid of this thing cracking and leaving me stranded. Mit initiates mass manufacture of disposable face shields. Is clearwater cylinder head still a goto place for a replacement head. The cylinder head was again changed for the 2000 model year to a more emissionsfriendly design. Guy doing the work just called and said theres no place for the temp gauge sensor. Early 0331 heads are prone to cracking, causing coolant to contaminate the oil, which can lead to catastrophic engine failure. Replaces casting 331 7120 630 nickle alloy material for longer durability both intake and exhaust have hardened valve seat inserts reinforced ribs for additional strength fully machined gasket surfaces meets or exceeds o.

My question is about a head i purchased before i had all the facts i needed. I know an 0331 is a downgrade, but this xj is my daily driver, and ive got to get it running. Jeep cherokee cylinder head optionsopinions i have a 2000 xj with 46k on the clock and i am pretty certain it has the 0331 head on it. Promaxx performance oereplacement jeep inline cylinder. Jeep cylinder heads remanufactured by clearwater cylinder. When i had my mechanic remove the valve cover, pressurize the radiator, and look carefully between the number 3 and 4 pistons, there was a very fine crack in the cylinder head that let coolant seep through. I would like to find out how to identify what head my engine has on it. In any of these situations, pulling the cylinder head to repair or replace it is necessary to keep the engine in good operating condition.

First, make sure the coolant in the oil didnt kill the bearings. The best for this solution would be to find a 06 4. Early 0331 head castings are prone to cracking, causing coolant to. If your jeep originally had an 0331 head, you plan to keep your stock exhaust manifolds, and your planning to install an 0630 or 7120, then yes. How to identify 0331 or tupy head jeep wrangler tj forum.

So if you need to add coolant and cant find a leak with an inspection, suspect a cracked head. The 0331 head cracking issue is blown out of proportion on here sometimes. Would you use this head and gamble on some decent mileage out of it or, spend more money and get a tupy or another head. We have determined it is easier to ship out smaller parts and part out engines vs shipping entire engine thus the reason this head was pulled. This is a direct bolt on cast iron cylinder head to replace your factory casting.

Promaxx performance developeddesigned this cylinder head from the oe casting 331. I am currently replacing the cylinder head on my 01 xj with a clearwater cylinder head. Came as a completely new,valves,springs, head cast is more solid than the factory cracked 0331 head. If you have an 0331 head, watch your coolant reservoir. If you installed aftermarket headers for your 0331 before it cracked, then ill say probably.

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. No, not all will fail, but this forum and others have plenty of threads of ones that have. Just put your core head in the box that you received your newrebuilt head in and attach the prepaid peel and stick label. Choose newnot rebuiltcylinder heads for your jeep redo from the selection of. I noticed the coolant has been low and have replaced some twice now in about a month long period. I believe this is the same kind of scenario with the pistons.

Came as a completely new,valves,springs,head cast is more solid than the factory cracked 0331 head. Several warning signs combined with a thorough cylinder head inspection can nip the problem in. Does anyone on here have any ideas as to anything that would pose an issue with the swap. Just like the title states a massive crack somewhere inside the head or block. Some people say the 0331 isnt as bad as people say. I talked with several mechanic friends and the head fleet mechanic at work told me the cracked head is extremely common. I know that the older heads do not have the mounting bosses for the coil rail but that wont pose a. That is a challenging problem in this crisis, explains culpepper. Dragway tools brings you a brand new replacement cylinder head to relieve the worries of your engine failing. Im worried that i may have one of the weak heads in my jeep. I read on here about someone who made some sort of bracket to secure the ignition coil to a 0630 head. Numerous problems become apparent when your engine cylinder head for jeep cherokee stops functioning.

Several warning signs combined with a thorough cylinder head inspection can nip the problem in the bud before major engine wear occurs. Im interested in swapping in a low mileage salvage motor from a 200204 grand cherokee or a 0206 wrangler. Its tough to say if and when the 0331 head problem was fixed. I did the homework before buying this head, i have found none of the problems adressed on the net. After testing a few materials that cracked and broke when bent, the team chose polycarbonate and polyethylene terephthalate glycol known more commonly as petg as the shields material. See more ideas about massachusetts, humor and boston strong. Once again this is an all new head, only one i found that wasnt a billion dollars. Engine is toast due to the wonderful 0331 head design and its notorious tendency to crack. The cracking can just occur without overheating or with overheating.

Nov 17, 2009 i bought a 2000 jeep cherokee xj limited with the 4. On a scale of 1 to 10 i would rate head replacement on a 4. So my mj has suffered the dreaded 0331 head crack syndrome common to the late xj 4. The early heads have far superior flow numbers and resist cracking better than the later heads. If youve found your way here, then you probably already have a cracked 0331 head in your jeep or you are thinking about a preemptive replacement of your 0331 in favor of the more reliable 0630 or 7120 heads. Certain years were susceptible to cracked heads due to a casting flaws.

Turned on the heater and temp immediately dropped to normal driving temp. Along with tims suggestion of a tupy cylinder head redesigned 0331, if you want to go new, contact clearwater cylinder head or alabama cylinder head and they can set you up with one of their redesigned new heads. In 2002 they contracted with tupy manufacturing in brazil to remake the head casting that ran until the 4. Ive read that the heads labeled 0331 are prone to cracking and that they were changed to a head labeled tupy to fix the problem.

The head is then assembled with the new oversize valves and performance valve springs. Jeep cylinder head casting 0331 stamping is a visible stamp on middle at. The early heads all crack in the same place and nowhere else so far anyway. Promaxx performance oereplacement jeep inline cylinder heads. I have decided to buy a used late model 0331 head and remove it from the donor vehicle myself, that way im certain that im getting what i want. These issues include white smoke coming out of the tailpipe and antifreeze within the radiator starting to bubble. Ebay part compatibility listing is only a reference guide. Certainly not all with the 0001 will experience a cracked 0331 head, but enough do to make it a very viable concern. This is a bare casting and is casted with much more nickle and reinforced in the prone areas for cracking.

I bought a 2000 jeep cherokee xj limited with the 4. They show up as either coolant in the oil or steam in the exhaust, or both. Its a casting flaw that only impacts some of the jeeps. Ive read that the heads labeled 0331 are prone to cracking and that they were changed to a head labeled. As a result, this lead to catastrophic engine failure. They have helped countless of unfortunate jeepers with their cracked 0331 head. Decent replacement for the crackprone 0331 factory cylinder head. Dont buy a remanufactured cylinder head you will eventually have the same issues of the oem head cracking. Developed and designed from oe castings, these iron heads feature hardened valve seats and heavierthanstock castings to resist cracking and warping. Im sure youre looking for some quick answers about this adapter plate, so lets get right to it.

High mileage wranglers should not be your main concern but rather how the jeep was maintained. Mostly this is for wranglers as by this time they knew of the cracking issue with the 0331 head and the cherokee was being killed off in 2001. It was a faulty design that jeep refuses to take responsibility for. Been doing some reading on swapping in an older xj head in place of the cracked 0331 20002001 pos.

As with many other xj owners, my cylinder head is cracked due to the defective 0331 head. Dec 18, 2017 hi everyone, ive searched for this and havent really found any good answer. Coolant in the oil from a cracked 0331 head will toast your engine. I have 225k miles on my jeep and most parts are original, so i also decided to replace the water pump, thermostat housing and tstat, intake manifold, valve cover, push rods, rocker arms, 4hole injector upgrade, oxygen sensors, serpentine belt, and spark plugs. It seems like people think that just by turning the key that the head will split wide open and then jump out of the jeep and start eating small children. Heads with tupy markings indicate the brazil manufacture who started making the 0331 head in 2002 and they are ok. For what a head replacement costs i wouldnt pass up a special jeep. Yes, if your jeep overheats even one time, the 0331 heads may crack.