Gm cracked flex plate noise

Once the new one was installed the noise disappeared. To me it sounded like a mad woodpecker somewhere under the truck. The flexplate also has gear teeth on it which the starter engages to start the engine. Oil pressure is good, 45 at idle up to 75 at 4500 rpm. Chevy starter fitment is not a one size fits all situation. 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 key to choosing the correct bolt pattern and tooth count is measuring the torque converter you are using. Dec 30, 2012 other than the noise the truck runs great, uses a small amount of oil but nothing extreme. Tranny fluid looks fine, it doesnt slip and theres no loss of power. Check for loose converter bolts or cracked flex plate.

To test for a loose or cracked flywheel, operate the vehicle at approximately 32 kmh 20 mph and shut off the engine. Yes, i also have a ticking noise, yes, i also have a. Loud knocking sound from torque converter or flywheel. A mechanic told me after listening to it, not looking at it that it was the flex plate. It didnt fix the noise but now when i start the truck it sounds pretty bad only while. Got a new plate on and transmission bolted up, just need to connect everything else back up and were good to go. Need help ticking sound from flexplatetorque converter thread starter crazyelvis3577. That in turn was the reason the front seal was not happy. Repair of the differential is usually recommended to be left in the hands of professionals because of the complexity of the system. The sound seems to happen most on cold days 40 and under. Understanding and diagnosing rear differential noise. Noise the classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. No noise what so everi took the trans out and the flex plate looked like brand new with no cracks.

Check for cracked or broken fan blades or a loose fan. As a result, this can cause the flexplate to wobble. Some aftermarket flexplates are drilled with both patterns to accept large and small. The torque converter is bolted to the flexplate, and so the engines rotation is delivered to the transmission through it. I had the transmission rebuilt thinking it was the flywheel or torque convertor and wasnt the problem but transmission was in. It was way back in 1912 when charles kettering developed the first electric selfstarter. But honestly it will sometimes happen on warmer days as well. 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. The flexplate mounting bolts on the 1 piece block are a lot closer together than they are on a 2 piece, so theres a lot more stress on the flexplate as there is less metal between the holes. Gm replaced it with a factory replacement with no explanation of why it cracked.

The sound is very similar to a bad engine rod and is often misdiagnosed. Made the devils own noise as i recall until it failed completely. If so, more than likely its just the triple clutch setup makeing noise. I think the shifts are setup too hard on the computer causing the flex plates to break actually. If the flywheel simply looks worn and has no major cracks or damage, you can try to have it resurfaced. Rattle noise and cracked flexplate 20152018 ford edge. Hand turning it over i found that the new flex plate is not running true. So with the vehicle running i crawled underneath to try to see it the noise got louder but once i got under the vehicle it sounded like it was coming from the transmission. The frequency seems too quick to be valve noise, sounds like harmonic balancer or cracked flex plate noise. Check for excessive end play and side play in the water pump. Remove the inspection cover from the driver side of the bell housing see if the converter is loose. Mar 21, 2010 i was told by several people it could be a cracked flex plate.

There are tough flexplatesand there are chuck norriscaliber flexplates. Jun 19, 2007 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. A loose or cracked flywheel will produce an irregular thud or click. Sure enough, the converter had a crack almost all the way around the portion that the input shaft slides into. This saturday i slid the torque converter off the flex plate and got the engine hot. Flexplate replacement tips, and what else to inspect.

Typically, a new starter will make noise when its positioned too close to the ring gear on the flexplate or flywheel. I dont know if the dowels are still there i will see this weekend. Start the engine, put in drive, foot on the brake, give it some rpm, does that quiet the noise loose bolts and cracked flex will usually be less noise doing that. The sound is very similar to a bad connecting rod and is often misdiagnosed. You would have to drop the pan to do this gasket and that can be tough if you have the engine held up by the oil pan with the trans out. This may be the result of a cracked engine flexplate. I have a loud knocking noise coming from the engine. I was told that a small crack in the flexplate could mimic the sound of rod knock or piston slap. Months ago the overdrive light on the column shifter would blink constantly and the check engine light came on. If a thud is heard, the flywheel may be loose or damaged.

I actually took a few pictures of the cracked portion if you are interested. What are the signs of a cracked flywheel in a 1998 chevy. Im really not too hip on transmissions, id appreciate any help on this. If the source of the noise is detected from the bell housing, remove the transmission to inspect the flywheel. When replacing the flexplate, lubricate the torque converter pilot hub with multipurpose grease xl5a esb. If you are really talking about an automatic transmission flexplate, then a clicking noise at a lower rpm that seems to go away as yoiu wrap up the motor would indicate a crack. Rear differential noise, when ignored, can lead to major problems and permanent damage on the ring and pinion.

Cracked fly wheel usually gets louder as it gets hotter, or under heavier load. Knocking can also be caused by loose or missing torque converter mounting bolts or a warped flexplate. Mark brought it to our attention that the factory flexplate has tendencies of flexing hence its name, and can be responsible for developing a crack or two overtime. Cracked gm flexplates are pretty common, and make a heck of a rattling noise.

Apr 09, 2010 turns out the flexplate was cracked all around the bolts holding it to the crank. A knocking noise coming from the rear of the engine may indicate a cracked flexplate. 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. This newfangled engine starter made it easy for men and women alike to start their horseless carriage, and would signal the end to hand cranking the engine to get your car running. When a flexplate cracks, it often produces a loud knocking noise as it rotates.

Rattling noise when engine starts gm truck club forum. The flexplate in an automatic is the same part as a flywheel in a manual. Your problem could be the starter drive gear is loose and hitting the flywheel, a loose flywheel bolt, or a cracked flywheel. A failed flexplate is pretty much an unlucky event under normal. If you hear grinding noise when you start your vehicle, the flexplate ring gear may have worn, chipped or broken teeth. Yes, i also have a ticking noise, coming from my 2004 trailblazer torque converter area. Ok, so i replaced my flexplate 290,000 miles to see if that eliminated the lower end noise in my engine. This may be due to a flexplate crack around the crankshaft. Does cracked flex plate makes nocking noise answers. Power loss at high speeds, the flexplate like most engine parts endures a considerable amount of strain and stress.

Nov 16, 2006 it has a few thousand miles since the trans rebuild. 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. I have seen a bunch where motor was pulled for said rod knock and broken flex plate was found. The reason for the sound involves the flexplate s location and its function. Flexplate failure chevy tahoe forum gmc yukon forum. I was just driving and it suddenly reved like kicking the a. Burning out is like hitting it with a sledge, eventually youll beat a hole in it. And we also have heavyduty and sfiapproved flexplates for highhorsepower, highrpm race applications. A 168 tooth flexplate uses a 11 12inch bolt circle. And when the engine turned over the flexplate bolts would shave a bit of the starter plate away. Flex disk goes on each end of the drive shaft, could only make noise if car was moving. They would only make noises at certain loads, and wouldnt make any noise in park or neutral, no matter what the rpms were. Flywheel resurfacing is a process where it is run through a machine to make the surface of the flywheel smooth and. Gm performance view topic broke my fourth flexplate.

Yeah the ting ting ting noise sounds about right i had a 302 with a broken flexplate, it was cracked between each bolt hole and fell apart in two pieces when i pulled it out. Finally, you might notice rhythmic clunking or grinding noises while the engine is running. A 153 tooth flexplate will be paired with a torque converter that has a 10 34inch bolt circle. Kinda funny if i managed to break a flywheel we will see hopefully next week. At first i thought it was comin from the top but when i get under it its alot louder sounds like its comin from the oil pan. Proposed the issue was the flex plate rather then the engine. Jun 26, 2008 then noise may change when the clutch is engaged or disengaged. If you are talking about a flywheel for a manual transmission equipped car, the most obvious symptom of a cracked flywheel is a knock. Oct 27, 2014 cant pinpoint the source of the noise im thinking either the flexplate or torque converter its a 2000 5. The flexplate has cracked twice in the past 6 months. Agree with missing bolts as well, but, i believe there was a member on here a while back that had similar issues and the center portion of the flex plate was actually cracked and broken allowing it to free spin. I had a 86 k20 t400 350 gasser company truck that would break the center out of the flexplate every 5000 miles. My uncle thinks it may be a cracked flex plate from how i described it to him. I would take that cover off and turn the flywheel by hand to see if you can see a loose bolt.

Is the new ring gear wider than the factory ring gear on the flex plate. Try to identify if the noise is from the front, center or rear of the engine. In this video i talk about a noise coming between the engine and transmission. Installing thin, steel shims between the block and starter is the method to. My noise always happens light load at around 2,000 rpms. Without enough clamp force on it, it got pushed out.

Nailing down a broken flywheel posted to technical tips forum on 91920 24 replies up until a couple of weeks ago we had never replaced or had any problems with broken flywheels on the newer, to us, gm full size pickups. Noise in my chevrolet silverado sounds like flywheel. What could cause flywheel noise on 2004 chevy fixya. The reason for the sound involves the flexplates location and its function. Jan 27, 2009 torque converter flex plate bolts discussion in. I had it replaced no fun to try to do myself on a dirt driveway got the truck back and on cold start it talks a minute to go into drive or reverse. 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.

Chevrolet silverado 1500 questions loud knocking noise 5. We know it is 2mm larger in diameter, my question is regarding the width of the ring gear from front to back of the vehicle is there any fore aft play in the starter shaft that could be allowing the bushing to move towards the starter motor and thus hitting the ring gear. That had caused it to run slightly off center, which wore a path in the collar on the torque converter. The first indication was the it was hitting the starter teeth. Is there a recall for defective flywheels flexplate 2004.

A loose bolt on a flexplate or a crack between its bolt holes. 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. The same things that cause the flexplate to crack can also cause transmission problems. The noise i was having was indeed a badly cracked flex plate. Damaged and leaking front seals and front transmission pumps are common symptoms. I put in a new flexplate stock 400 couldnt snag an sfi quick. Correction to diagnose this concern, use chassis ears or a stethoscope to determine if the noise is coming from the bell housing. I dont recognize this noise so ive been trying to find videos with similiar noises. I am guessing that the converter must have been put on and not fully seated placing undue stress on it.

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. Gm factory125,000 miles, it cracked again i have a 2000 chevy suburban lt2500 4 x 4, 4speed automatic that the flexplate cracked on at 110,000. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplate s movement will create a noise. Thought they saw a crack in flex plate, i have a warranty that covers the flex plate, i had to authorize the removal of trans for further inspection, but the shop said the spacer looks bad and they found no cracks. The flex plate replaces the flywheel in automatic transmission cars. Weve got tough yet affordable flexplates for stock and mildly modified street vehicles. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. Descriptions of the sound include clanking, chirping and a light knocking. Rattle noise from engine flex plate 20152018 ford edge ford.

It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. This rating is based on an average across 345 unique models. Usually doesnt do it after a drive for a while, turn the truck off, then turn it back on. The noise i am hearing sounds like a loud, rattling or grinding noise, but its a deep sound like thicker metal rattling together, not like thin heat shields. This noise may be caused by a cracked flywheel flexplate. 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 floor of the vehicle while it is stopped and the engine is revved. As i start to move the knock speed increases slightly with rpm but then stops and the engine runs fine. It made a knocking sound similar to a cracked flexplate. The only ones i have found sound similair are like this, where they say they have a loose flywheel. 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. Turns out the flexplate bolts were right up against the starter plate.

The noticeable symptoms are a rattling or crackling noise at idle, similar to the sound made by the heat riser in the older engines. 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 engine is a reman and has less than 50000 on it. The good news is it was caught before a catastrophic failure. Im just glad it didnt do any damage to the engine or transmission. Try running it with the fan, alternator andor ps pump belt removed. How to know if a flexplate is warped it still runs. Rattle noise from engine flex plate 20152018 ford edge.