Jan 27, 2009 the engine was installed in 2000 and 6 months late i blew up the transmission thats when i had a sfi rated flex plate installed. Oct, 2005 i have a noise under the hood of my 96 legacy gt automatic transmission. I have a noise under the hood of my 96 legacy gt automatic transmission. They usually crack near the bolts to the torque converter. Then whom ever replaced the fp before me didnt catch the peened bellhousing and tightened it down causing a alignment problem. Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. A cracked flex plate will cause that or you may have a faulty starter causing your sound. 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. Ah, well, this is the first real money ive put into keeping the old girl on the road. There was a slight wobble in the flex plate, due to the distortion from the crack.
The ring is integral to inexpensive flexplates but can often be removed and replaced on flywheels. Mine cracked between two of the large holes not the bolt holes. 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. Once i found the cracked exhaust, and had it welded, the noise went away. Feb 11, 2011 dude, looking at your questions for the past 2 weeks, you should give up trying to fix your own vehicle. Maybe the flexplate or converter bolt is loose and not able to spin freely. As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. Had this happen in my brothers 302c4 in his mustang. 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. So while youre in there, check the flex plate for cracks or damage, you might just find the source of your noise this way. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. I have access to a shoplift and plan to do this work myself and with a coworker.
The reason for the sound involves the flexplate s location and its function. It makes a bad vibration at about 2k, but not specifically a rattleknock. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplate s movement will create a noise. Listen for any rhythmic clunking or grinding noise while the engine idles in park or neutral, or idling in gear with a foot on the brake pedal. About a week ago i started hearing a ticking sound and assumed it was a lifter ticking so ive used cleaners and such to try to eliminate the sound. A serious crack can cause a mild vibration when driving, so can a faulty torque converter. One day with the trailer attached, sound move from front to back. This video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 toyota 4runner with a 3. A loose bolt on a flexplate or a crack between its bolt holes. The truck has 172,000 miles on it now and had the trans rebuilt at 88,000. Checked inspection plate, no carnage but wasnt able to rotate by hand. A flywheel usually does not crack and fail like a flex plate.
Dude, looking at your questions for the past 2 weeks, you should give up trying to fix your own vehicle. 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. Flex plates get cracks around the bolts that hold it to the crankshaft and can make a clicking noise. I tried to start the car again and it struggled, got it to turn over abit but sound like metal was grinding but did not start. You may be able to remove the cover off of the bottom of the bell housing of the transmission and inspect it. Come to think of it, its a good idea to also check the flex plate for cracks. A cracked flex plate will usually cause a squeaky sound like a belt but shorter and sharper and changes when in gear or park and under load. A flex plate is the automatic transmission version of a flywheel. Well, the tranny shop tells me that its a cracked flex plate. Here is my tread about a destroyed flex plate on a 300d.
Symptoms of a cracked flexplate general discussion. I have an engine noise at the top end rpm in each gear. How long can i continue driving with a broken flex plate. 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. Op, youve probably got broken teeth on the flex plate, it is going to need to be replaced eventually, if youre getting an intermittent clicking sound from it just keep an ear on it. The reason for the sound involves the flexplates location and its function. The sound is very similar to a bad engine rod and is often misdiagnosed. Cracked fly wheel usually gets louder as it gets hotter, or under heavier load. May 27, 20 you can isolate a broken flex plate by bringing the rpms up to about 1800 and keep it steady. Pull lower pan,check rod movement,or remove bearing cap. A loose bolt on a flexplate or a crack between the bolt holes can. Noise in my chevrolet silverado sounds like flywheel. Aftermarket springs and shims are available to solve the problem.
I cracked two flexplates on a 350 olds i drove balls out all the time, until i threw away the torque converter and got a good one. The flex plate replaces the flywheel in automatic transmission cars. The sound is very similar to a bad connecting rod and is often misdiagnosed. A badly cracked flexplate will cause a similar sound to a fan hitting the radiator. Mine ended up being a cracked exhaust at the bend above the rear axle. When you crack them out where the converter bolts are, they have a very tinny, almost ringing sound under load, and the cracks are very hard to see.
One more thing to check would be the side thrust of the crankshaft. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. If the flex plate is cracked, there will be one solid knock sound when you turn the key back on. I did a lot of online research last night and think it is most likely a cracked flex plate. Symptoms of a cracked flexplate heard a knocking sound. I would take that cover off and turn the flywheel by hand to see if you can see a loose bolt. If you only tow 5% of the time and this is a daily driver, then a 34 ton might be ok but it is no 12 ton as far as comfort and mileage.
When you hit the right cylinder with the bad rod bearing the sound will quit or get much. I cant explain why the harmonics made it tick up by the flex plate and flywheel. Descriptions of the sound include clanking, chirping and a light knocking. 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.
Then noise may change when the clutch is engaged or disengaged. Try loosening the tc bolts to allow the tc to move back slightly and evenly using the bilts to pull it back towards flex plate to allow it to self centralise. It ended up being the exhaust was partially cracked just above the rear differential. I investigated it and it sounded like it was coming from the.
Sometimes the flex plate will crack and as a result it can cause noise. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. Damaged and leaking front seals and front transmission pumps are common symptoms. Broken or loose bolts on the crankshaft end of the flexplate, or on the torque converter side, missalign the flexplate, causing a high side of the plate to strike or rub against internal components. This led to valve float at high rpms sometimes causing bent or broken pushrods. Can anyone describe what a cracked flex plate sounds like. I really hope thats what it is, and that the noise will go away when replaced. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running.
Once the inspection cover is off use a hunk of heater hose like a stethoscope that should help locate it. Usual failure mode is the crankcase bolts or the torque converter bolts work loose, allowing the parts to start moving in different directions, the clicking sound you heard. To resolve this concern, verify that the flexplate is cracked around the crankshaft using the inspection plate and a mirror. Need help ticking sound from flexplatetorque converter. Need help ticking sound from flexplatetorque converter thread starter crazyelvis3577. Pulled one plug from each cylinder, no damages to the plugs. The flexplate has cracked twice in the past 6 months. Perform a flex plate test, if you are hearing noises. Cracked flex plates sound like a tick, squeek, rattle they all sound similar but different.
How to know if a flexplate is warped it still runs. Jeep grand cherokee questions is it common for a loose. The flex plate usually makes quite a racket that is not mistakeable for a belt problem. I have a cracked flex plate im told i might need a flex plate, torque converter and possibly a front pump bearing cost for parts and labor 2004 gmc sierra 2500 hd close. Rattle noise and cracked flexplate 20152018 ford edge. A rattling noise the behind engine loose flywheel bolts. This may be due to a flexplate crack around the crankshaft.
I was thinking that was possible but i cant figure out why the noise goes away hot. A couple of weeks ago i started to get a clicking sound that would speed up slow down with engine speed, but i just assumed was the exhaust. Loose torque converter bolts and cracked flex plates. Proposed the issue was the flex plate rather then the engine. Jul 10, 2016 can anyone describe what a cracked flex plate sounds like. As a result, this can cause the flexplate to wobble.
The first cracked fp for me i ignorantly assumed the missing torque converter bolt was the problem so i missed the bellhousing problem. Plus it is mainly the 3rd gen vans that break them. If you are talking about a flexplate for an automatic transmission the most obvious symptom of a cracked flexplate is a vibration felt in the. It bolts to the end of the crankshaft and the transmissions torque converter bolts to it.
If you hear a grinding noise while starting your vehicle, chances are you have a. Next day try to start it, sounded like a weak battery or starter but car started. The first signs were visible when i removed the dust cover and turned the engine over. Jun 26, 2008 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. Dealership says i could have a cracked flex plate jeep. I was just wondering how many of you out there with the 4. When they crack near the crank flange, they sound rodknockish.
To me it sounded like a mad woodpecker somewhere under the truck. Right off the bat, they said it didnt sound like piston slap. Its not your classic lifter noise and i think ive narrowed it down to either a cracked flex plate this may be why my idle has gotten a little rough, a bad timing belt tensioner on the right side or main bearing noise. So while youre in there, check the flex plate for cracks or damage, you. Supposedly chrysler has come out with a new replacement plate that will not crack, and it isnt supposed to be that expensive. But check for an exhaust leak they can sound the same.
If its a rod knock, you can make the sound change or go away by pulling off each plug wire one at a time. It could be the flex plate, but really depends on the sound. I had posted a similar question when i first got my vehicle around sep. It all depends mine cracked around the center and sounded just like loose bolts. Also listen for any rhythmic clunking or grinding noise while the engine is idling in neutral or park.
I would have picked her up today, but the shop got the wrong replacement flex plate shipped to them supplier had the wrong plate in the box. After some googling and much reading, it looks like i have a cracked flexplate. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the crank and torque converter and the most common cause of transmission to engine misalignment. Loose torque converter bolts and cracked flex plates diagnosing noises in your car ericthecarguy video description.
When a flexplate cracks, it often produces a loud knocking noise as it rotates. A cracked flex plate is almost always a sign of other problems. Does cracked flex plate makes nocking noise answers. The same things that cause the flexplate to crack can also cause transmission problems. Cracked exhaust ended up with transgo stage 3 shift kit, hd flex plate, and billet single disc lock up converter with short cut to allow for flex plate thickness. In gear, at a stop light, there was a ticking sound. Dec 28, 2004 right off the bat, they said it didnt sound like piston slap. I had not listened to the video on my last replythat is not a cracked flex plate i think it.