The first indication was the it was hitting the starter teeth. May 26, 2015 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. Aug 23, 2010 i took a floor jack and put a slight amount of pressure on the center of the 700r4 pan. Similar to a baseball card being stuck in a spoke of a bicycle. 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. The flex plate replaces the flywheel in automatic transmission cars. Sep 03, 2009 we have a 2002 ford explorer with a 5r55s and it has a noise that sounds like a rock rattling in a convertor or a broken flex plate. Loose torque converter bolts and cracked flex plates. Hand turning it over i found that the new flex plate is not running true. Th400, th350, 700r4, 4l60e, 4l80e, 6l80e, 2004r and others. Oct 29, 2006 700r4 torque converter spacing to flex plate i just installed a 700r4 to a 350 chevy, with the torque converter in place, pushed as far back on the shaft as it would go there was a gap between the torque converter and the flex plate, about 12 inch.
Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. Since it doesnt do it all the time i dont think it can be anything rubbing, right. What is causing this noise from flexplate torque converter area. I got a brain teaser for ya, im thinking broken flex plate in my 73 blazer however when im in gear low rpms and rolling down the street i hear the consistent pinging, but if i put the truck in neutral while still moving the noise quits. When they go bad the converter will not be able to lock when going down the highway. I removed the transmission inspection cover and moved the flexplate back and forth and it made a creaking sound. View from inspection plate back of inspection plate.
Got a new plate on and transmission bolted up, just need to connect everything else back up and were good to go. The noise starts as a ticking that coordinates with your engine speedget a buddy to watch while you give the motor quick gentle revs, he should see the flexplate wobble a bit if its cracked. Listen for any rhythmic clunking or grinding noise while the engine idles in park or. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. I have a 65 restored gto 400 ci 700r4 transmission. Im just glad it didnt do any damage to the engine or transmission. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. Flex disk goes on each end of the drive shaft, could only make noise if car was moving. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. Symptoms of a cracked flexplate general discussion. A flex plate is the flat piece of metal that connects the engine to the transmissions torque convert. 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.
So for a summary, the 700r4 transmission was a 4geared hydraulic automatic transmission with the 4th gear which was an overdrive gear 30% increase. Your flexplate could also be cracked as well, certainly not unheard of on a 6. A cracked flex plate is almost always a sign of other problems. I took the vehical to my trany guy and he tould me to there and jump the lock up and see if the noise would go away and no it was still there. The flexplate has cracked twice in the past 6 months. This video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 toyota 4runner with a 3. If you logged it while it was making rattling noise, theres a good chance its not in the flexplate area. And when the engine turned over the flexplate bolts would shave a bit of the starter plate away. I have seen on occasion the torque converter bolts get loose and. Broken or loose bolts on the crankshaft end of the flexplate, or on the torque.
Mine was cracked all the way around the center mounting holes shop the new. From what the po told me, the motor is a 350 from a 72 monte carlo. Random rattling noise from bellhousing area the truck stop. Turns out the flexplate bolts were right up against the starter plate. Cracked flex plate my runner has been making a ticking noise when warmed up for the last 20k miles. I just always assumed it was an exhaust leak or loose header. Last year the flex plate cracked and i had it replaced. The tci 399753 flexplate fits 1998 and newer fbodies with ls1 engine as. For this reason, a torque converter noise can be easily confused with the noise made by one of the direct drum bearings. Yesterday i was coming home and the gradual rattle started just like last year and by the time i got home the noise was as bad as the first time. Atp z166 automatic transmission flywheel flexplate product image. Youll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other. Need help ticking sound from flexplatetorque converter.
The sound is very similar to a bad engine rod and is often misdiagnosed. Proposed the issue was the flex plate rather then the engine. The recommended transmission fluid is dextron vi with a capacity of. Jun 26, 2008 then noise may change when the clutch is engaged or disengaged. I still have the engine because i didnt think it was a rod but never have pulled it apart to check the bottom end. Symptoms of a cracked flexplate general discussion modern. Those factors ensure that when the engine starts and the driver puts it in.
Transmission flex plate repair maintenancerepairs car. A torque converter noise will get quieter as the drive wheels begin rolling slowly from a stop. I have a chevy 15500 silverado v8 that is making an engine noise. Flywheel and flexplate dust covers 700r4 transmission type. If it does not change doing that, may be a cracked 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. Car shifts fine though and doesnt make noise til engine is warm. Cracked flex plate toyota 4runner forum largest 4runner forum. Also listen for any rhythmic clunking or grinding noise while the engine is idling in neutral or park. Noise in my chevrolet silverado sounds like flywheel. Loud knocking sound from torque converter or flywheel. Pull lower pan,check rod movement,or remove bearing cap. Apr 14, 2017 my flex plate cracked itself around the hub portion, broke loose and jammed itself so tight against the rest of the flex plate that it continued to work miraculously, while making a god awful noise that i thought was an engine knocking.
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. Similar in function to a flywheel in manual transmission engines and called a flexplate due to its expansion, or flexing. Stall bolttogether torque rattling noise from driveshafttransmission area. I just thought id post a short video of what a cracked flexplate on a 6. If you have a knocking noise from your engine it might not be the engine itself. Remove the flexplate to see if the noise disappears.
Be aware of any starter spin that bogs, then picks up again, and bogs again in a rhythmic sequence. Apr 24, 2018 bad torque converter clutches modern torque converters will lock to create a true physical connection between the automatic transmission and the engine. The noise was coming from the back of td5 near the bell housing i was thinking big end bearings, bent conrods, cracked pistons, broken valves or springs. I guess it could be a flex plate but sort of seems more like the sound that could come from the converter. Register now to gain access to all of our features. A vital part of an automobile engine equipped with automatic transmission, a flexplate consists of a piece of thick sheet metal that bolts to the crankshaft and torque converter. I pulled transmission back out to check for cracked flexplate, but looked fine. It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. I had a simmilar noise in that area once and found the starter gear wasnt retracting all the way and bouncing off the flex plate. Notice if the starter has a low, medium or highpitched whine while spinning.
This allows the transmission to operate more efficiently at higher rpm. Most have teeth around the edge for the starter to engage into when starting your car. This gives us a good indicator that there are no issues. The reason for the sound involves the flexplate s location and its function. In this video i talk about a noise coming between the engine and transmission. I put in a new flexplate stock 400 couldnt snag an sfi quick.
My went bad, it cracked in two spots made terrible noise at idle. I left it for a week and this morning i pulled the inspection plate of the bell housing and this is what i found here a video to emphasize the racket a broken flex plate may sound like. Bad torque converter vs bad transmission drivetrain resource. You can see the crazy pictures in my old thread below. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise.
The flex plate i have heard that look like the ones in the pic really mess with the idle. How to know if a flexplate is warped it still runs. Descriptions of the sound include clanking, chirping and a light knocking. Demonstration of broken flexplate causing no start condition. Symptoms of a cracked flexplate welcome to modern mopar forum. I could see a flex plate making noise if it was cracked or i could see a starter making noise when it trys to engage the damaged teeth on a flex plate so i wonder here what is causing the flex plate to be noisy,all they do is spin around. The same things that cause the flexplate to crack can also cause transmission problems. 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.
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