Ls1 cracked flex plate sound

A tickclanking coming from around the torque converter inspection plate cover area only at idle. 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. Mechanical fuel pump, loose harmonic balancer, loose torque converter and the aforementioned cracked flex plate have been some that i have experienced. It didnt fix the noise but now when i start the truck it. 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. When they crack near the crank flange, they sound rodknockish. Theyre thicker than stock, doublewelded with a forged onepiece ring gear.

Well its been about 4 months or so since i found out that my flex plate was cracked. The rotating assembly with flexplateconverter may be thrusting forward. The ticking noise was coming from the torque converter area. Ah, well, this is the first real money ive put into keeping the old girl on the road. If your motor came with a bent or broken flex plate or you just. I was told that a small crack in the flexplate could mimic the sound of rod knock or piston slap. I think the shifts are setup too hard on the computer causing the flex plates to break actually. After removing the flex plate and looking at it i still could hardly make out the crack but that ended up being the problem. Make sure this fits by entering your model number gm performance parts 19260102 flexplate ls engine to 4l60 trans dimensions in inches lxwxh. The most common signs and causes of starter motor failure. Hays 10030 hays steel sfi certified flexplate gm ls engines. I pulled transmission back out to check for cracked flexplate, but looked fine. If your motor came with a bent or broken flex plate or you just want something new, speedway motors carries a kit from tci that has everything for you. The solenoid pushes a little gadget that engages with the flywheel flex plate, so that when the starter spins, it turns the motor.

It ended up being the exhaust was partially cracked just above the rear differential. Ok, so i replaced my flexplate 290,000 miles to see if that eliminated the lower end noise in my engine. View profile view forum posts private message view articles view gallery uploads member join date jan 2011. To resolve this concern, verify that the flexplate is cracked around the crankshaft using the inspection plate and a mirror. When mine cracked it made a real loud grinding sound like two metal gears trying to engage but only slipping in and out. The reason for the sound involves the flexplates location and its function. This plate will fit stock size intakes 76mm, and some fast intakes. Ive broken so many of these things and no real reason. Oct 27, 2014 cant pinpoint the source of the noise im thinking either the flexplate or torque converter its a 2000 5. Ls1 flexplate question hello all, is the lq4 flex plate and a ls1 flex plate the same. 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. Why is my 2000 lincoln ls making a rattling sound upon. A warped flexplate can make metaltometal contact with the inspection plate cover, or the starter drive mechanism, and can also make a knocking.

Track day in the e55 and bonus race on the way home. As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. Is it possible to install a flywheel backwards by accident. A loose or cracked flywheel will produce an irregular thud or click. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. It fits fine but the snout is all the way in and the flex plate is about 14 to 516s away from the plate i have and. Car ran great after we got everything back together.

I know i would know for certain if i look under the car and inspect it myself but dont have the time currently to do so. The cracked hub is a little harder, usually experience with cracked flex. I have a ticking noise on the underside of my 89 camaro that looks and sounds like its coming from the torque converter area. Other than using a stethoscope or a long extension placed on the block at various cylinder locations and listening for the small differences in noise i cant help you much on the lifter noise. The torque converter on a general motors 4l60e automatic transmission is an essential link between the engine and driveline. Last time i hunted the exhaust, lifters, bearings, only to find out i had to do the damn flex plate and it only had 2030k on it maximum. A loose bolt on a flexplate or a crack between its bolt holes. I had to move the car in the spring due to a impending seperation and when i started it. This flexplate will allow your ls1 series engine bolt up to a 4l80e or th400 with the standard 11. If you have this plate, all you need is pn 57518346. The crack was in between the crankshaft mounting bolt holes.

The torque converter uses fan blades in a sealed case to create a fluid coupling that transfers power from the engine to the transmission. In this video i talk about a noise coming between the engine and transmission. Here is my tread about a destroyed flex plate on a 300d. 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. I have came to believe i have either cracked my flex plate nd cant start my car or my motor is seized. Could the trans flex plate stop my car from starting. For serious performance, tci machined sfiapproved flexplates are a must have. 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. When i put the car in d and hold firmly on the brake pedal, i can raise the rpms to 900 and create a loud vibration that comes from. Nothing on the crank to flexplate flange or the trans to engine flange that could be causing misalignment, right.

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. Proposed the issue was the flex plate rather then the engine. Even with the torque converter unbolted and slide back it was very hard to see the crack. Recently noticed at idle either in park or in neutral i hear ticking sound from the bottom of the car. 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. With the engine running it looks like the flex plate has a slight wobble to it. 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. The flexplate spacer will need to be installed between the engine and the flex plate. I really hope thats what it is, and that the noise will go away when replaced. To test for a loose or cracked flywheel, operate the vehicle at approximately 32 kmh 20 mph and shut off the engine. If you have a knocking noise from your engine it might not be the engine itself. I had my precision stall converter re stalled and they made the motor side snout a little longer so it would bolt up the a ls motor.

Available in several internally and externally balanced applications. Some aftermarket flexplates are drilled with both patterns to accept large and small. Michigan motorsports ls1 flexplate adapter spacer fits gm th350 th400. Sep 26, 2017 use a flex plate holding tool once you have the bolts initially snug so you can bring the bolts to final torque of 85 lbft. Any of these three items could cause your vibration. When a flexplate cracks, it often produces a loud knocking noise as it rotates. Since i bought it knowing hg was blown i never had it up to operating temperature to know if this sound was present before i replaced engine and torque converter. The ticking increases and decreases with the engine speed. Loose torque converter bolts and cracked flex plates.

Hey guys, its been awhile since ive been on here since my lt1 swap this summer. A cracked flex plate will often make a popping noise or a tinny sound when running. I have seen a bunch where motor was pulled for said rod knock and broken flex plate was found. You can drop the flywheel cover and inspect for missing weights on either convertor or flex plate. It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. Dynotune nitrous oxide ls1, ls6 nitrous oxide plate with gasket and bolts. There is a real loud knocking sound coming from what sounds like the torque converter or flywheel area. God awful noise and flywheel wobble chevy message forum. Im not sure if i get get a new starter, or have to pull the goddamn tranny for the 4th time in a week to replace the flexplate and wait for a new plate. What causes a flexplate to crack twice after two replaced. As a result, this can cause the flexplate to wobble. I have access to a shoplift and plan to do this work myself and with a coworker.

The tci 399753 flexplate fits 1998 and newer fbodies with ls1 engine as well as 99 and newer gm trucks with 4. If you just hear a whirring sound like the starter motor is spinning without affecting the motor, then the solenoid is either broken, or theres a wiring issue on the starter itself. It all depends mine cracked around the center and sounded just like loose bolts. Chevrolet flexplates powerglide transmission type free. 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. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise.

Well, the tranny shop tells me that its a cracked flex plate. While factory stock plates tend to crack around the crankshaft hub when punished under high torque and rpm conditions, the thicker hays flexplate handles the force. Price is basically the ultimate deciding factor when purchasing parts. 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. This video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 toyota 4runner with a 3. It has a few thousand miles since the trans rebuild. 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. I drove the car hard so it very well could have broke the motor.

Almost sounds like rod knock, but i just put the engine in and its been doing it since i first started it up. If my starter is spinning but not engaging flywheel, what is. If my car ran low on oil and now there is a knocking sound. You can tell because the center of the plate will protrude towards the motor. In our quest for horsepower, we ordered a trick flow sfiapproved harmonic dampener, which is designed to be 25 percent under driven to free up more horsepower. Dec 26, 2009 witch side of the flexplate goes toward the engine. One day with the trailer attached, sound move from front to back. After driving it the ticking doesnt seem to be going away so i thought maybe it was an exhaust leak at the manifold. Thats why the fastener experts at arp have developed special bolts that are far superior to oem hardware. Hello all, is the lq4 flex plate and a ls1 flex plate the same. 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. It didnt fix the noise but now when i start the truck it sounds pretty bad only while the starter is engaged. Try loosening the tc bolts to allow the tc to move back slightly and evenly using the bilts to.

Anyways, the other day i went to start it up after driving it the night before and there was a clanking noise that would come and go while idling in park. My uncle thinks it may be a cracked flex plate from how i described it to him. Spacer can be removed so the flexplate can used with the early 6. Pull lower pan,check rod movement,or remove bearing cap. The ls1 is more than two decades old, but a stock unit can still benefit from an ls6 intake manifold swapto the tune of 25 hp and 20 lbft of torque over stock. If a thud is heard, the flywheel may be loose or damaged.

The flex plate replaces the flywheel in automatic transmission cars. If the flexplate is cracked, replace the transmission fluid pump, flexplate, flexplate bolts and torque converter. The same things that cause the flexplate to crack can also cause transmission problems. Then noise may change when the clutch is engaged or disengaged. Loud knocking sound from torque converter or flywheel. Supposedly chrysler has come out with a new replacement plate that will not crack, and it isnt supposed to be that expensive. Summit racing has a huge instock selection of flexplates. Why is my 2000 lincoln ls making a rattling sound upon acceleration. Because its a bearing and just spins when it gets hit, its bouncing, giving that weird empty hollow metal sound.

Buy ict billet ls heavy duty flywheel flexplate crank holding tool flex plate holder ls1 lsx ls3 lm7 lr4 lq4 ls6 l59 lq9 lm4 l33 ls2 lh6 l92 l76 ly2 ly5 ly6 551911. I know that theres the possibility of an exhaust leak tick or a valve tick, but im pretty positive that this is my problem area. Shop flexplates from ati, tci, hughes performance, hays, quicktime, and others. I removed the transmission inspection cover and moved the flexplate back and forth and it made a creaking sound. A 153 tooth flexplate will be paired with a torque converter that has a 10 34inch bolt circle. As i start to move the knock speed increases slightly with rpm but then stops and the engine runs fine. Rattle noise and cracked flexplate 20152018 ford edge.

He says theres some kind of plug missing that when covered hides the noise. Mine was cracked all the way around the center mounting holes shop the new. Many of the people reading this right now own fbody camaros, and want to know if they should mod their lt1, or swap in an ls1. Noise went away almost when it warmed up but i can still hear it. The flex plate could also have cracked at the crankshaft hub. How to know if a flexplate is warped it still runs. This may be due to a flexplate crack around the crankshaft. I have seen about everything concerning flex plates over the past 40 years. After some googling and much reading, it looks like i have a cracked flexplate. Its a tough decision, and 8 years ago i wouldve said mod the lt1.

Jan 14, 2003 slp performance parts of toms river, new jersey offers solutions for your stickshift 19982002 ls1 powered fbody or 1997up corvette. The sound is very similar to a bad connecting rod and is often misdiagnosed. Another sound to listen out for is a general buzzing noise. Descriptions of the sound include clanking, chirping and a light knocking. A loose wrist pin can cause a rod knock like sound, so can excessive piston slap or a colasped piston skirt. 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 plate will support 75200hp, it is made from billet aluminum and has a wide angle spray pattern. Was not a pretty sound and scared the hell out of me cus it was loud. Customer experienced loud engine noise and our tech found a cracked flex plate from over tightened bolts. I have seen incorrect flex plates installed for the engine. Dec 28, 2004 right off the bat, they said it didnt sound like piston slap.

It can also cause a starter to act funny when starting the car. This is a sign that not enough electricity is getting to the starter motor. This auction is for one new dynotune nitrous oxide plate with gasket and bolts. Nov 16, 2006 it has a few thousand miles since the trans rebuild. This sleeve slides onto the nose of the torque converter and helps align the unit into the flexplate. A 168 tooth flexplate uses a 11 12inch bolt circle. I have seen on occasion the torque converter bolts get loose and. Chevrolet silverado 1500 questions loud knocking noise 5. You really should check the end play on the crank using a dial indicator should measure 0. The key to choosing the correct bolt pattern and tooth count is measuring the torque converter you are using. A dull sound when the engine decelerates from a rev in park.

If it is the flex plate could be cracked and that too can sound like a rod knock. The sound is quite similar to that of an electrical fence. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. Ls heavy duty steel flex plate ict billet prw ls flexplate wbolts ls1 th400 th350 700r4 swap flywheel sfi 10. Gm performance view topic broke my fourth flexplate. A cracked flexplate can allow relative movement between the converter and crank flange, as well. Damaged and leaking front seals and front transmission pumps are common symptoms. Slp lightweight flywheel ls1 install guide gm hightech. Jun 11, 2008 i own a shop, and have had a transmission shop for years now. Ls1 nitrous oxide plate ls6 nitrous oxide plate c5.

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