It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. So while youre in there, check the flex plate for cracks or damage, you. A flex plate is the automatic transmission version of a flywheel. I would take that cover off and turn the flywheel by hand to see if you can see a loose bolt. Dealership says i could have a cracked flex plate jeep. Here is my tread about a destroyed flex plate on a 300d. You may be able to remove the cover off of the bottom of the bell housing of the transmission and inspect it. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. Cracked fly wheel usually gets louder as it gets hotter, or under heavier load. 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. 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.
Proposed the issue was the flex plate rather then the engine. Rattle noise and cracked flexplate 20152018 ford edge. Oct, 2005 i have a noise under the hood of my 96 legacy gt automatic transmission. I have an engine noise at the top end rpm in each gear. Supposedly chrysler has come out with a new replacement plate that will not crack, and it isnt supposed to be that expensive. 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. Descriptions of the sound include clanking, chirping and a light knocking. 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. The sound is very similar to a bad engine rod and is often misdiagnosed. A badly cracked flexplate will cause a similar sound to a fan hitting the radiator.
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. Jul 10, 2016 can anyone describe what a cracked flex plate sounds like. Checked inspection plate, no carnage but wasnt able to rotate by hand. Dec 28, 2004 right off the bat, they said it didnt sound like piston slap. Also listen for any rhythmic clunking or grinding noise while the engine is idling in neutral or park. 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 had not listened to the video on my last replythat is not a cracked flex plate i think it. It all depends mine cracked around the center and sounded just like loose bolts. 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. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. Aftermarket springs and shims are available to solve the problem. Then noise may change when the clutch is engaged or disengaged. 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. 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 lower pan,check rod movement,or remove bearing cap. Symptoms of a cracked flexplate heard a knocking sound. One day with the trailer attached, sound move from front to back. The flex plate replaces the flywheel in automatic transmission cars. A serious crack can cause a mild vibration when driving, so can a faulty torque converter. I investigated it and it sounded like it was coming from the. Well, the tranny shop tells me that its a cracked flex plate. 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. Mine cracked between two of the large holes not the bolt holes. If the flex plate is cracked, there will be one solid knock sound when you turn the key back on. With a flex plate in neutral you probably will not hear it, but when you pull it down into drive with a low idle you will hear itbest thing i found with no chassis ears is to head back behind one of the mall stores good acusticspark along side the building passenger window down do an idle test in neutralthen pull it into drivefeather the throttle and see if the noise changes with rpm. Does cracked flex plate makes nocking noise answers.
Need help ticking sound from flexplatetorque converter. 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. Flex plates get cracks around the bolts that hold it to the crankshaft and can make a clicking noise. Perform a flex plate test, if you are hearing noises. Come to think of it, its a good idea to also check the flex plate for cracks. I had posted a similar question when i first got my vehicle around sep.
The truck has 172,000 miles on it now and had the trans rebuilt at 88,000. Maybe the flexplate or converter bolt is loose and not able to spin freely. This video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 toyota 4runner with a 3. When a flexplate cracks, it often produces a loud knocking noise as it rotates. 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.
There was a slight wobble in the flex plate, due to the distortion from the crack. The reason for the sound involves the flexplates location and its function. How long can i continue driving with a broken flex plate. 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. Pulled one plug from each cylinder, no damages to the plugs. To me it sounded like a mad woodpecker somewhere under the truck. 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. 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 sound is very similar to a bad connecting rod and is often misdiagnosed. A cracked flex plate is almost always a sign of other problems. Once i found the cracked exhaust, and had it welded, the noise went away.
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. Need help ticking sound from flexplatetorque converter thread starter crazyelvis3577. As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. If its a rod knock, you can make the sound change or go away by pulling off each plug wire one at a time. Loose torque converter bolts and cracked flex plates diagnosing noises in your car ericthecarguy video description. 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. A loose bolt on a flexplate or a crack between its bolt holes. I have access to a shoplift and plan to do this work myself and with a coworker. A loose bolt on a flexplate or a crack between the bolt holes can. After some googling and much reading, it looks like i have a cracked flexplate.
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. Can anyone describe what a cracked flex plate sounds like. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplate s movement will create a noise. When they crack near the crank flange, they sound rodknockish. The same things that cause the flexplate to crack can also cause transmission problems. Cracked flex plates sound like a tick, squeek, rattle they all sound similar but different. When you hit the right cylinder with the bad rod bearing the sound will quit or get much.
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. A rattling noise the behind engine loose flywheel bolts. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. If you hear a grinding noise while starting your vehicle, chances are you have a. I was just wondering how many of you out there with the 4. I was thinking that was possible but i cant figure out why the noise goes away hot. It ended up being the exhaust was partially cracked just above the rear differential. Noise in my chevrolet silverado sounds like flywheel. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. It could be the flex plate, but really depends on the sound. Right off the bat, they said it didnt sound like piston slap.
The first signs were visible when i removed the dust cover and turned the engine over. This led to valve float at high rpms sometimes causing bent or broken pushrods. Had this happen in my brothers 302c4 in his mustang. The first cracked fp for me i ignorantly assumed the missing torque converter bolt was the problem so i missed the bellhousing problem. I cant explain why the harmonics made it tick up by the flex plate and flywheel. How to know if a flexplate is warped it still runs. Sometimes the flex plate will crack and as a result it can cause noise. 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. 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. They usually crack near the bolts to the torque converter. In gear, at a stop light, there was a ticking sound. The flex plate usually makes quite a racket that is not mistakeable for a belt problem. The flexplate has cracked twice in the past 6 months.
Loose torque converter bolts and cracked flex plates. As a result, this can cause the flexplate to wobble. 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. This may be due to a flexplate crack around the crankshaft. Symptoms of a cracked flexplate general discussion. I did a lot of online research last night and think it is most likely a cracked flex plate.
To resolve this concern, verify that the flexplate is cracked around the crankshaft using the inspection plate and a mirror. One more thing to check would be the side thrust of the crankshaft. A cracked flex plate will cause that or you may have a faulty starter causing your sound. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. Dude, looking at your questions for the past 2 weeks, you should give up trying to fix your own vehicle. Mine ended up being a cracked exhaust at the bend above the rear axle. Feb 11, 2011 dude, looking at your questions for the past 2 weeks, you should give up trying to fix your own vehicle. Jeep grand cherokee questions is it common for a loose. 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. Next day try to start it, sounded like a weak battery or starter but car started. Plus it is mainly the 3rd gen vans that break them. Damaged and leaking front seals and front transmission pumps are common symptoms.
Once the inspection cover is off use a hunk of heater hose like a stethoscope that should help locate it. The ring is integral to inexpensive flexplates but can often be removed and replaced on flywheels. 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. A flywheel usually does not crack and fail like a flex plate. 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. I really hope thats what it is, and that the noise will go away when replaced. 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. I have a noise under the hood of my 96 legacy gt automatic transmission. 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. But check for an exhaust leak they can sound the same.