0331 cylinder head crack

Just like the title states a massive crack somewhere inside the head or block. I talked with several mechanic friends and the head fleet mechanic at work told me the cracked head is extremely common. Buy any head other than 0331 add bracket to hold coil rail or adapt a 3. 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. I am currently replacing the cylinder head on my 01 xj with a clearwater cylinder head. Certain years were susceptible to cracked heads due to a casting flaws. My understanding is that this head is present on all 4.

The cracking can just occur without overheating or with overheating. Models between 2000 and 2006 used the 0331 cylinder head. Discussion in general tech started by bogleparsons, feb 5, 2019. 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. How much will cylinder head repair cost at a garage. The tupy head was also a 0331 head that had been redesigned with a thicker deck. Jeep cylinder heads remanufactured by clearwater cylinder.

May 16, 2017 one application i used it on was exactly what was discussed above, a crack head on an engine. So if you need to add coolant and cant find a leak with an inspection, suspect a cracked head. Promaxx performance oereplacement jeep inline cylinder. New and improved cylinder heads for jeep cars and trucks.

Dec 23, 2016 cracks do not necessarily mean a cylinder head has to be replaced. My brother thought it was a cracked head or gasket. How to fix a cracked engine block bluedevil products. The original 0331 left has nothing cast into that spot. Odds are that we do have your head, but we have not added it into the online store yet. All xj nonmodifiedstock questions go here 0001 xj cracked cylinder head overview after doing a lot of reading on various forums regarding jeep 4. Year models between 2000 and 2001 which used the 0331 cylinder head were prone to cylinder head cracking and oil leaks. Product is a great value,all new, with no core to hasel with. 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. Well after a few months of wondering where the coolant was going, i finally found the source. 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.

This is often referred to as porting and is popular among those looking to. After doing a lot of reading on various forums regarding jeep 4. They made about 400 jeeps a day in toledo and a bad run of anything can be had. 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. Wanted to share a few picks of my first head replacement. Certainly not all with the 0001 will experience a cracked 0331 head, but enough do to make it a very viable concern. Came as a completely new,valves,springs, head cast is more solid than the factory cracked 0331 head. Jun 19, 2019 so my mj has suffered the dreaded 0331 head crack syndrome common to the late xj 4. Some people never have an issue, but man does the 0331 head get killed in the treads. As a result, this lead to catastrophic engine failure. Promaxx performance developeddesigned this cylinder head from the oe casting 331.

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. A friend of mine has another head i can get very cheap. Forums and the internet usually only post the negative side of things, no one starts a post on how great the 0331 head is. Jeep wrangler cylinder head replacement after infamous 0331 crack wpics so i had the infamous crack between cylinder 3 and 4. Decent replacement for the crack prone 0331 factory cylinder head. I did the homework before buying this head, i have found none of the problems adressed on the net. I see alot of places offering a new not remanufactured 0331 head. The water jacket cracks can be hard to see sometimes. If you do not see your jeep head listed below, then please call us at 18005721963. Okay here s the idea everyone with an 0331 head cracked or not, take a. In fact, many cracked heads that were once thought to be unrepairable are now being fixed.

Once again this is an all new head, only one i found that wasnt a billion dollars. Jeeps engines are widely considered to be bulletproof and reliable. In extreme cases a cracked or damaged cylinder head can result in terminal damage to the entire engine. High mileage wranglers should not be your main concern but rather how the jeep was maintained. As with many other xj owners, my cylinder head is cracked due to the defective 0331 head. I was wondering if the new 0331 heads have the same issue as the original ones that came on these engines. You can usually see the crack with the engine running looking through the oil fill hole in the valve cover. How to repair cracked cast iron cylinder head it still runs.

Im sure youre looking for some quick answers about this adapter plate, so lets get right to it. Promaxx performance oereplacement jeep inline cylinder heads. Nov 21, 2009 just because one cylinder cracked does not mean that the others will crack any time soon. 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. Im worried that i may have one of the weak heads in my jeep. Can a crack in cylinder head of a diesel engine be repaired. How to tell if your cylinder head is bad or cracked. Not knowing specifically where the leak is coming from, the head gasket sealer would treat a wider range of components ie. 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. Odessa cylinder head 5100 ulmerton rd, suite 2, clearwater, fl, 33760 7272999058 the part number is chr238zn, described as 6cyl, 4. Awful lot of 20002001 wranglers with well over 150,000 miles with the 0331 head with no problems.

A jasper engines head will be reinforced in that area to prevent future cracking. Knowing what to look for and whats going on is 99% of the battle so im not worried. You can also buy an aftermarket 0331 head from clearwater that has a thicker deck to prevent the cracks. 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. Early 0331 head castings are prone to cracking, causing coolant to contaminate the oil. 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. Turned on the heater and temp immediately dropped to normal driving temp. So am i straight with the 9901 xjs and 9902 wjs having the 0331 head. Lastly, the 0331 will have smaller cylinder head dowels than the 7120. 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. Here are some warning signs and symptoms which may be caused by cylinder head damage. As you can guess, there is now a crack in it and needs to be replaced. You can for a fact bolt up the newer style manifolds on the older head.

My tj has the 0331 head and i have a little over 100,000 miles on it. Is clearwater cylinder head still a goto place for a replacement head. These heads are stamped tupy in the valve cover gasket area on the intake side. That is simply not true, and to even say they are prone to cracking would not be an accurate statement imo. Apparently, the problem head is stamped 0331 and was used from late 99 till around 01. We stock almost every cylinder head you could need including ford, gm, dodge, chrysler and most foreign heads such as honda, toyota, mazda, nissan, bmw, vw, audi and many more.

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. Every time it is brought up, generally speaking only people that have experienced this problem will chime in and say my head cracked. Product was successfully added to your shopping cart. 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. Get 2 or 3, and it starts to scare people into thinking that every 0331 head will crack. Wrangler xjs and the xjs where susceptible to this mainly due to high production quantities.

How to identify 0331 or tupy head jeep wrangler tj forum. 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. If where to grind the crack is difficult to see than using a dye penetrant test is recommended. They show up as either coolant in the oil or steam in the exhaust, or both. Regarding early xjs, the head was only present on 2000 and 2001, 2001 being the last year of xj production. 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. Now who all has heard of this or experienced this from on here. Since 1968, cylinder heads international has been rebuilding quality cylinder heads. A can of dye penetrant can be bought at any welding supply house. The extra air getting to the o2 sensor will make the jeep run rich, foul cat, and run like crap.

In any of these situations, pulling the cylinder head to repair or replace it is necessary to keep the engine in good operating condition. This head weighs 85 lbs and the original head weighs 78 lbs. 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. This video shows you a little bit of information on locating and interpreting casting marks on cylinder heads and blocks. It held up nicely until the engine finally gave up the ghost and a new lawn mower was needed. You may sacrifice a little power due to inefficiency, but not enough to matter. I noticed the coolant has been low and have replaced some twice now in about a month long period. Just been reading about the common problem of a cracked head on early tjs with the 4. 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. Supposedly the failures are the result of a bad batch early on. A lot of cylinder head cracks occur from overheating and are located in the water jacket ares or occur at the valve seats. All three of these are are 0331 heads because of the design of the ports, and all three of them. And how soooo many people have experienced this and it must and will happen to you or i. 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.

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. After 2001 the cylinder head defect was corrected and the problem was subsequently resolved. I would have to say it probably not even close to 100% or even close to 50% of the 0331 heads that crack. The best for this solution would be to find a 06 4. A tupy head will have tupy cast into it right there, like so. This is a direct bolt on cast iron cylinder head to replace your factory casting. The machining for the guide bosses and seats leaves a lot to be desired, lots of sharp edges. 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. Markbased on your description, we would recommend using the bluedevil head gasket sealer. In 2002 they contracted with tupy manufacturing in brazil to remake the head casting that ran until the 4. Call surefire at 18007909094 for customer service, availability and technical assistance. I bought the jeep about 3 years ago, and about a year ago coolant started leaking into the oil. Thought about one of the odessa heads from cypress machine on ebay, but expensive. The ports were relatively smooth, but the chambers were very rough.

I was looking for better casting to replace it with and saw that the 7120 is highly regarded. The head gasket ended up going and i had milkshake for oil. I would like to find out how to identify what head my engine has on it. Im sure youre looking for some quick answers about this adapter plate, so lets get right to.