0331 cylinder head crack

Odessa cylinder head 5100 ulmerton rd, suite 2, clearwater, fl, 33760 7272999058 the part number is chr238zn, described as 6cyl, 4. I would have to say it probably not even close to 100% or even close to 50% of the 0331 heads that crack. 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. Promaxx performance developeddesigned this cylinder head from the oe casting 331. Wanted to share a few picks of my first head replacement. You can look through the oil fill cap and determine if the head is either cracked, prone to cracking, or that it wont crack in the future.

In fact, many cracked heads that were once thought to be unrepairable are now being fixed. The extra air getting to the o2 sensor will make the jeep run rich, foul cat, and run like crap. Since 1968, cylinder heads international has been rebuilding quality cylinder heads. The cylinder head creates the space for the passages that feed air and fuel to the cylinders, and is sealed in place by the head gasket. How much will cylinder head repair cost at a garage. You can for a fact bolt up the newer style manifolds on the older head. All three of these are are 0331 heads because of the design of the ports, and all three of them. A jasper engines head will be reinforced in that area to prevent future cracking.

Regarding early xjs, the head was only present on 2000 and 2001, 2001 being the last year of xj production. In the 22 years ive owned and flown my 1979 cessna t310r, i have had to retire 2 of the 12 cylinders because of head cracks. Can a crack in cylinder head of a diesel engine be repaired. Get 2 or 3, and it starts to scare people into thinking that every 0331 head will crack. 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. It held up nicely until the engine finally gave up the ghost and a new lawn mower was needed. This head weighs 85 lbs and the original head weighs 78 lbs. Some coil pack brackets will need to be fashioned as there arent any bosses to bolt the coil pack down on earlier 91 thru 99 cylinder heads. If i have a bad head ill change it out if not then good for me. Depending on the life its lead the engine may have another 40k50k miles before it needs a rebuild cracked head is another story which is relatively straight forward with these jeep 6s. Apparently, the problem head is stamped 0331 and was used from late 99 till around 01. A friend of mine has another head i can get very cheap. Promaxx performance oereplacement jeep inline cylinder heads.

Such a sign can be a cause for concern, as oil or coolant may also back up into the engines internal chambers if the crack. Lastly, the 0331 will have smaller cylinder head dowels than the 7120. Just been reading about the common problem of a cracked head on early tjs with the 4. Decent replacement for the crack prone 0331 factory cylinder head. Not knowing specifically where the leak is coming from, the head gasket sealer would treat a wider range of components ie. I bought the jeep about 3 years ago, and about a year ago coolant started leaking into the oil. The head gasket ended up going and i had milkshake for oil. That is simply not true, and to even say they are prone to cracking would not be an accurate statement imo. Some people never have an issue, but man does the 0331 head get killed in the treads.

As with many other xj owners, my cylinder head is cracked due to the defective 0331 head. Just like the title states a massive crack somewhere inside the head or block. Now who all has heard of this or experienced this from on here. I am currently replacing the cylinder head on my 01 xj with a clearwater cylinder head. If where to grind the crack is difficult to see than using a dye penetrant test is recommended. Here are some warning signs and symptoms which may be caused by cylinder head damage. Sep 14, 2018 this video shows you a little bit of information on locating and interpreting casting marks on cylinder heads and blocks.

Odds are that we do have your head, but we have not added it into the online store yet. 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. You can usually see the crack with the engine running looking through the oil fill hole in the valve cover. If you do not see your jeep head listed below, then please call us at 18005721963. How to fix a cracked engine block bluedevil products. Awful lot of 20002001 wranglers with well over 150,000 miles with the 0331 head with no problems.

A can of dye penetrant can be bought at any welding supply house. The original 0331 left has nothing cast into that spot. I see alot of places offering a new not remanufactured 0331 head. A tupy head will have tupy cast into it right there, like so. Promaxx performance oereplacement jeep inline cylinder. I talked with several mechanic friends and the head fleet mechanic at work told me the cracked head is extremely common. After 2001 the cylinder head defect was corrected and the problem was subsequently resolved. The best for this solution would be to find a 06 4. They made about 400 jeeps a day in toledo and a bad run of anything can be had.

So am i straight with the 9901 xjs and 9902 wjs having the 0331 head. 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. I noticed the coolant has been low and have replaced some twice now in about a month long period. A cracked cylinder head can cause this to leak, which can be most noticed by a puddle of oil forming on the ground when the vehicle is parked for a long enough time. In extreme cases a cracked or damaged cylinder head can result in terminal damage to the entire engine. Models between 2000 and 2006 used the 0331 cylinder head. Ive read that the heads labeled 0331 are prone to cracking and that they. You know about the coil pack bosses, so no need to mention that. Buy any head other than 0331 add bracket to hold coil rail or adapt a 3. In 2002 they contracted with tupy manufacturing in brazil to remake the head casting that ran until the 4. Supposedly the failures are the result of a bad batch early on.

So if you need to add coolant and cant find a leak with an inspection, suspect a cracked head. Jeep wrangler cylinder head replacement after infamous 0331 crack wpics so i had the infamous crack between cylinder 3 and 4. The machining for the guide bosses and seats leaves a lot to be desired, lots of sharp edges. Nov 21, 2009 just because one cylinder cracked does not mean that the others will crack any time soon. Product was successfully added to your shopping cart. My brother thought it was a cracked head or gasket. How to tell if your cylinder head is bad or cracked. Im sure youre looking for some quick answers about this adapter plate, so lets get right to. You can also buy an aftermarket 0331 head from clearwater that has a thicker deck to prevent the cracks. Okay here s the idea everyone with an 0331 head cracked or not, take a. As a result, this lead to catastrophic engine failure. A lot of cylinder head cracks occur from overheating and are located in the water jacket ares or occur at the valve seats. Is clearwater cylinder head still a goto place for a replacement head.

Discussion in general tech started by bogleparsons, feb 5, 2019. They show up as either coolant in the oil or steam in the exhaust, or both. Turned on the heater and temp immediately dropped to normal driving temp. Forums and the internet usually only post the negative side of things, no one starts a post on how great the 0331 head is.

I would like to find out how to identify what head my engine has on it. My tj has the 0331 head and i have a little over 100,000 miles on it. Came as a completely new,valves,springs, head cast is more solid than the factory cracked 0331 head. How to identify 0331 or tupy head jeep wrangler tj forum. The cracking can just occur without overheating or with overheating. You may browse the list of jeep cylinder heads below or use the search form below to find the cylinder head for your specific jeep vehicle. How to repair cracked cast iron cylinder head it still runs. Certain years were susceptible to cracked heads due to a casting flaws. May 16, 2017 one application i used it on was exactly what was discussed above, a crack head on an engine. This is often referred to as porting and is popular among those looking to. New and improved cylinder heads for jeep cars and trucks. Markbased on your description, we would recommend using the bluedevil head gasket sealer.

These heads are stamped tupy in the valve cover gasket area on the intake side. This video shows you a little bit of information on locating and interpreting casting marks on cylinder heads and blocks. The ports were relatively smooth, but the chambers were very rough. Dec 23, 2016 cracks do not necessarily mean a cylinder head has to be replaced. I get maintenance of the coolant system is keybut i dont want to take the chance of my daughters overheating the thing and creating a bigger issue with a 0331 failing on me. After doing a lot of reading on various forums regarding jeep 4. Jun 19, 2019 so my mj has suffered the dreaded 0331 head crack syndrome common to the late xj 4.

I own a 2000 wj and just replaced the 0331 head in it at 170k because it started dripping coolant out the exhaust pipe when idling for long periods. Call surefire at 18007909094 for customer service, availability and technical assistance. As you can guess, there is now a crack in it and needs to be replaced. Im sure youre looking for some quick answers about this adapter plate, so lets get right to it.

Once again this is an all new head, only one i found that wasnt a billion dollars. Im worried that i may have one of the weak heads in my jeep. Year models between 2000 and 2001 which used the 0331 cylinder head were prone to cylinder head cracking and oil leaks. High mileage wranglers should not be your main concern but rather how the jeep was maintained. The crack on my jeeps 0331 head was about 1 14 long and you could see the coolant flowing out of it when the engine was running. Well after a few months of wondering where the coolant was going, i finally found the source. Product is a great value,all new, with no core to hasel with. Early 0331 head castings are prone to cracking, causing coolant to contaminate the oil. Another option that many jeepers settle for is refurbishing jeep engine cylinder heads to make them more effective, rather than spending their hardearned cash on a new jeep 2. I was looking for better casting to replace it with and saw that the 7120 is highly regarded.

Jeeps engines are widely considered to be bulletproof and reliable. All xj nonmodifiedstock questions go here 0001 xj cracked cylinder head overview after doing a lot of reading on various forums regarding jeep 4. Jeep cylinder heads remanufactured by clearwater cylinder. I opted for a clearwater cylinder head from odessa. Such a sign can be a cause for concern, as oil or coolant may also back up into the engines internal chambers if the crack is large enough. Knowing what to look for and whats going on is 99% of the battle so im not worried. Cylinder head due to constantly changing temperatures and high pressure levels, the head has to be robust enough to withstand the demands placed on it without cracking or breaking. Wrangler xjs and the xjs where susceptible to this mainly due to high production quantities. Would be interesting to know if yours indeed is an 0331 and where exactly it is cracked a lot of them crack between cylinders 34. The tupy head was also a 0331 head that had been redesigned with a thicker deck. Certainly not all with the 0001 will experience a cracked 0331 head, but enough do to make it a very viable concern. The water jacket cracks can be hard to see sometimes.

You may sacrifice a little power due to inefficiency, but not enough to matter. Every time it is brought up, generally speaking only people that have experienced this problem will chime in and say my head cracked. My understanding is that this head is present on all 4. This is a direct bolt on cast iron cylinder head to replace your factory casting. I was wondering if the new 0331 heads have the same issue as the original ones that came on these engines. In any of these situations, pulling the cylinder head to repair or replace it is necessary to keep the engine in good operating condition. I did the homework before buying this head, i have found none of the problems adressed on the net.