Cracked flex plate knock

I had what sounds like a similar knock especially noticeable at or near idle. I need some help, i,ve had a knock sound coming from my torque converter area for a while. One clue you might look for based on an experience i had. I had posted a similar question when i first got my vehicle around sep. Start your vehicle as normal, but pay particular attention to the noise of the starter while it spins and engages the flexplate, or torque converter if your vehicle does not have a toothed flex plate. Think it goes in a little deeper to a bad trans front pump bushing and or a cracked torque converter hub. Descriptions of the sound include clanking, chirping and a light knocking.

Fontverdanaim leaning towards a cracked flex plate being the culprit not sure what could have led to a cracked flexplate, but very happy, to say the least, that its not the engine. As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. With c19, bbs doctors diagnosis was the equivalent of calling his sickness a cracked flex plate when it really was a bad rod knock in a sbc. I pulled the trany today and inspected the flex plate. Slight misalignment may only cause a single flexplate to break in the life of the vehicle. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. When i first start up my xj it doesnt make the noise but after a couple of minutes it begins to start knocking, it almost sounds like its coming from the front of engine but once you climb under it you can tell its coming from the flexplate area. Pull one plug wire at a time while its running, and if one cylinder has a knock, it will stop or change tone when you pull the plug on the effected cylinder. In this video i talk about a noise coming between the engine and transmission. After they checked it out, they said it was a cracked flex plate between the tranny and engine, and that this is a known issue with gm. The first signs were visible when i removed the dust cover and turned the engine over. For what its worth, if you had a broken or cracked flexplate it would be making a lot of noise. Give a guess in the comments section and stay tuned for pt. The knock was still there after installing the new flex plate.

My chevy started this tick noise out of now where thought about it and yea its the flex plate. Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. Proposed the issue was the flex plate rather then the engine. You may also hear the same knock as you would in a flywheel. How to know if a flexplate is warped it still runs. Not much sound out of the tailpipe, but i did notice the tickknock is loud even behind the truck, stumbled upon some people pointing at their flex plate, will take a look at it tomorrow. The first cracked fp for me i ignorantly assumed the missing torque converter bolt was the problem so i missed the bellhousing problem. When you hit the right cylinder with the bad rod bearing the sound will quit or get much. It will sound almost like an engine knock but will be heard from the area between the front of the transmission and rear of the engine. Dec 19, 2017 however to my way of thinking, a cracked flexplate wouldnt go away at all. What can i do to troubleshoot this aside from dropping the trans and inspecting. The symptom was a ticking sound under certain conditions. Sometimes the flex plate will crack and as a result it can cause noise. If the flex plate is cracked it should make noise like a lower end knock.

Loose torque converter bolts and cracked flex plates diagnosing noises in your car ericthecarguy video description. But when you raised the rpm to a middle level the knock went completely away. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. Might want to be ready for some water spray too with this test. Jeep grand cherokee questions is it common for a loose flex. The reason for the sound involves the flexplate s location and its function. Symptoms of a cracked flexplate welcome to modern mopar forum. I have seen on occasion the torque converter bolts get loose and. When i logged it, it pulled timing like crazy thinking it was engine knock, but in reality it was just a little dowel pin banging around. Had that on a small block chevy years ago and it sounded like a bad rod knock that would go away when warmed up. More than likely it is just loose flex plate bolts, or the flex plate itself is cracked and thats an entire different beast, and is a pretty simple fix. What could cause a knocking noise from a subaru engine. My uncle thinks it may be a cracked flex plate from how i described it to him. I just thought id post a short video of what a cracked flexplate on a 6.

It didnt fix the noise but now when i start the truck it. And probably, some lessthanawesome mechanics might even mistake said noise for an engine knock wristpin knock. At the center of the plate, bolts connect to the crankshaft. Cracked flexplate how can i tell the chrysler minivan. If the noise goes away with water flooding the bellhousingthen you have a cracked flex plate. Mechanical fuel pump, loose harmonic balancer, loose torque converter and the aforementioned cracked flex plate have been some that i have experienced. View from inspection plate back of inspection plate. Jan 27, 2009 is it common for these bolts to loosen up over time ive done a search for a rattling knocking sound from the transmission and it looks like converter or flex plate bolts. Excessive crankshaft flange runout or end plate can also cause flexplate cracking. To me it sounded like a mad woodpecker somewhere under the truck. Well i checked torque converter bolts for loosemess and they were fine no sighns of cracked flex plate what so ever im gonna pop off the valve cover as i had it running and drove it up on ramps the knocking noise even under a load could hardley hear it and the longer i had it running the quitter it got that doesnt sound like a rod or main or piston sounds more like a calapsed lifter. And no, i cannot see anything with the inspection cover off.

Glad he made it through the death knock and yeah, ok. Bell housing knocking chevy trailblazer, trailblazer ss and gmc. I am getting a pretty loud pinging noise when i go to start it up in. However to my way of thinking, a cracked flexplate wouldnt go away at all. Engine spark knock sounds like a metallic knocking. When a flexplate cracks, it often produces a loud knocking noise as it rotates. I have the back seats out so there isnt too much sound dampening back there, and i have been listening for any odd noises over the past few weeks. Injector knock or cracked flexplate diagnosis w 2009 chevrolet duramax lmm dually. Chevrolet silverado 1500 questions loud knocking noise 5.

Loose torque converter bolts and cracked flex plates. How to know if a flexplate is warped by chris stevenson. Flexing with engine speed was popping the metal back and forth on the cracks. Being an auto, it will be fluid balanced by the torque convertor, so babancing it wont be an issue. I was told that a small crack in the flexplate could mimic the sound of rod knock or piston slap. The same things that cause the flexplate to crack can also cause transmission problems. The reason for the sound involves the flexplates location and its function. If you happen to have a manual transmission, this does not apply.

Flex plate of a 2012 dodge grand caravan this is a known. Might want to be ready for some water spray too with. Does your xj ever knock at idle and go away at higher rpms. Im not one on hybrids, dont like them and in my opinion theyre worthless as theyre not really good in any one thing and they rode very rough when compared to a dedicated at tire or highway tire. I believe it is a cracked flexplate because i have a vibration when converter locks. First check your flywheel bolts,as the noise can be transferred. Apr 18, 2009 depends where you live and elements you drive in. Mine did this and it turned out that my flexplate was cracked bad. I checked the flex plate, and outside of the tc thru the inspection holes, they dont appear to be obviously damaged or cracked. As i start to move the knock speed increases slightly with rpm but then stops and the engine runs fine. More severe misalignment can break a flexplate in 15,000 to 30,000 miles.

Im leaning towards a cracked flex plate being the culprit. I really hope thats what it is, and that the noise will go away when replaced. I would bet a dime that you have a cracked or soon cracked flex plate between the flywheel and converter. Doctors diagnosis equivalent of a rod knock in a sbc but it really was a cracked flex plate. A loose bolt on a flexplate or a crack between its bolt holes. The trans temp shouldnt have any affect on a cracked or broken flex plate. I know it dosent have a chain so i took it to a local diesel shop and it turned out to be a bad flex plate probably caused by loose bolts. The likely cause for the cracked flex plate is likely due to misalignment because of dowel pins that keep. Loose flywheel or flexplate bolts make a rattling or knocking sound that. Did a log, no st or lt knocki have a pretty conservative tune. Symptoms of a cracked flexplate general discussion.

My buddy, when he cracked the converter hub, it pissed a lot of atf when you shut. Pull lower pan,check rod movement,or remove bearing cap. Thuroughly check the flexplate for cracks you may have a sound similiar to the one i had that cant be fixed by simply tightening the bolts. The sound is very similar to a bad engine rod and is often misdiagnosed. Notice if the starter has a low, medium or highpitched whine while spinning. Between the connecting rod and the crankshaft, a highpressure film of engine oil, less than half the thickness of a human hair, keeps moving parts from. I would assume it would envolve unbolting trans and moving it back. Does cracked flex plate makes nocking noise answers. Yesterday the flex plate on my 2000 toyota 4runner w 155k miles was replaced. It all depends mine cracked around the center and sounded just like loose bolts. Mar 03, 2015 in this video i talk about a noise coming between the engine and transmission. I have seen a bunch where motor was pulled for said rod knock and broken flex plate was found. Now obviously subaru boxer engines dont have top and bottom in the classical sense but the meaning is the same, the crank is screwed. Though i never heard about chrysler issuing a better replacement flex plate part.

Checked inspection plate, no carnage but wasnt able to rotate by hand. Check yours if you develop a knock, grind or rattle in the bottom of the engine. But with a crack flex plate if you press and hold the brake pedel and step on the gas pedel just a little the noise goes away with a rod knock the noise. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. I only say this because it happened to my 2000 and the dealer told me i had an engine knock and that my engine was toast. Come to think of it, its a good idea to also check the flex plate for cracks. So while youre in there, check the flex plate for cracks or damage, you might just find the source of your noise this way. A rattling noise the behind engine loose flywheel bolts. Then whom ever replaced the fp before me didnt catch the peened bellhousing and tightened it down causing a alignment problem. Valve lifter vs cracked flex plate vs rod knock noise. I have the same kind of knocking noise but i know what the problem is.

If you have a knocking noise from your engine it might not be the engine itself. It didnt fix the noise but now when i start the truck it sounds pretty bad only while the starter is engaged. What are the likely causes of failure so maybe i wont do it again. The classic and most obvious symptom of a cracked flexplate involves the sound it. If the flex plate is cracked, there will be one solid knock sound when you turn the key back on. Right off the bat, they said it didnt sound like piston slap. The problem turned out to be a cracked flex plate which. D2 2002 lower engine knock land rover and range rover forum.

I have not grounded out any plug wires to test for rod knock yet. If its a rod knock, you can make the sound change or go away by pulling off each plug wire one at a time. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplate s movement will create a noise. A rod knock will definitely change on float, you can run this at idle, unloaded, to help diagnosis only. However if it had done that you wouldnt have been able to restart the car because the starter would have nothing to spin the engine with. I had a cracked flexplate on my 74 that was a hard knock sound like a rod bearing at idle and low rpm. It seems the centrifugal force kept the plate from popping as it turned at higher speeds. I cracked two flexplates on a 350 olds i drove balls out all the time, until i threw away the. If you logged it while it was making rattling noise, theres a good chance its not in the flexplate area. Symptoms of a cracked flexplate general discussion modern. The water stabilizes the flex plate and lubes the crack. Customer experienced loud engine noise and our tech found a cracked flex plate from over tightened bolts.

It runs fine in park but in any other gear with my foot on the brake it has a very noticeable, almost loud knocking sound. The engineer put a triangular file on it and had no trouble marking the plate, he said it is just plain old mild steel, and welding would be no troubles. If you have an automatic transmission, you have a flex plate, and it is a possiblity, and it can be checked without. Jeep grand cherokee questions is it common for a loose. Ok, so i replaced my flexplate 290,000 miles to see if that eliminated the lower end noise in my engine. Following up on my previous question, i have a 97 chevy s10 zr2 4x4 with the 4. Sounds like rod knock maintenancerepairs car talk community. If you are talking about a flywheel for a manual transmission equipped car, the most obvious symptom of a cracked flywheel is a knock.

Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. Does your xj jeep ever knock at idle and go away at higher rpms. On automatic transmission vehicles, the flex plate connects the engine to the transmission. My guess would be if its flex plate related is loose torque converter bolts. This may occur in worn engines or engine that have been poorly rebuilt. It makes a bad vibration at about 2k, but not specifically a rattleknock. If in fact they did, perhaps mine will last longer.