Noise coming from Flexplate
Noise coming from Flexplate 4l60e with Hughs flexplate
The noise started about 50 miles after i got the car running.
I have used a stethoscope all over the engine and i was not able to hear that noise. It is definitely loudest right there at the flexplate. i have checked the bolts holding on the flexplate. One had backed out about 1 turn so i took it out put some locktite on it and put it back in. It still made the same sound
The noise is constant from when i first start the car to it being warmed up.
Does it look like my flexplate is warped a bit in the video?
https://www.youtube.com/watch?v=-YrD...ature=youtu.be
The noise started about 50 miles after i got the car running.
I have used a stethoscope all over the engine and i was not able to hear that noise. It is definitely loudest right there at the flexplate. i have checked the bolts holding on the flexplate. One had backed out about 1 turn so i took it out put some locktite on it and put it back in. It still made the same sound
The noise is constant from when i first start the car to it being warmed up.
Does it look like my flexplate is warped a bit in the video?
https://www.youtube.com/watch?v=-YrD...ature=youtu.be
Last edited by Rezorector; Jan 18, 2018 at 06:04 PM.
Sounds like the plate might be cracked partially around the middle just a guess but that's is what sounds like to me
__________________
Have you tried prying lightly on the flexplate through the inspection hole to see if its loose on the crank? If it's cracked you could possibly see/hear it also doing that. Just crank engine by hand to check in between all converter pads.
Trending Topics
tried to get some pictures of the converter bolts, i do not see any wear from them hitting something, cant see the whole bolt but.
Last edited by Rezorector; Jan 19, 2018 at 10:44 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Second to last pic actually looks like it might ba a crack below the bolt. Hard to tell for sure but that's where I'd start.
I'll also add that I've had flex plates fit over the crank pretty tight where I've had to beat them down flush before bolting them up. If not completely flush before bolting it down could cause some additional stress to it.
I'll also add that I've had flex plates fit over the crank pretty tight where I've had to beat them down flush before bolting them up. If not completely flush before bolting it down could cause some additional stress to it.
In the second to last pic that is just some excess arp loctite that ran down.
The boroscope came in today, i looked all around in there the best i could and i was not able to see and signs of cracks or any bolts rubbing.
Maybe its time to find a shop that can look at it.
The boroscope came in today, i looked all around in there the best i could and i was not able to see and signs of cracks or any bolts rubbing.
Maybe its time to find a shop that can look at it.
I said the hell with it and dropped the transmission. So far i have found nothing 
The flexplate looks good. All the bolts are seated all the way in, also checked the bolts on the other side of the converter on the trans, none of the show any signs of rubbing and they are all flush as well.
I am considering trying a different flexplate
The flexplate looks good. All the bolts are seated all the way in, also checked the bolts on the other side of the converter on the trans, none of the show any signs of rubbing and they are all flush as well.
I am considering trying a different flexplate
TECH Addict
Joined: Mar 2013
Posts: 2,628
Likes: 30
Just something to consider are you sure the bolts are not bottomed out in the threads? They might still look tight against the flex plate but be bottomed out not ptting full force on the flex plate. I seen this before and it sounded similar.
Its is the Hugh's flexplate Hughes Performance HP4004X-EBP. Not sure why i went with that one now, i did also have an issue with the starter hitting the flexplate until i put a shim in the starter.
They should be the correct ARP bolts for this application. Any way to test if they are bottomed out or not without taking off the flexplate or should i just pull that off, then see how far the bolts will go in?
They should be the correct ARP bolts for this application. Any way to test if they are bottomed out or not without taking off the flexplate or should i just pull that off, then see how far the bolts will go in?
The bolts are clear out the back until they run into the #5 main cap, so if they are to long they are currently digging in and filling the pan with shavings.
Its is the Hugh's flexplate Hughes Performance HP4004X-EBP. Not sure why i went with that one now, i did also have an issue with the starter hitting the flexplate until i put a shim in the starter.
They should be the correct ARP bolts for this application. Any way to test if they are bottomed out or not without taking off the flexplate or should i just pull that off, then see how far the bolts will go in?
They should be the correct ARP bolts for this application. Any way to test if they are bottomed out or not without taking off the flexplate or should i just pull that off, then see how far the bolts will go in?
Never would have guessed flexplate to crank bolts but that is a definite possibility to. Pull them out and see if there is some interference marks on the end of them.
TECH Addict
Joined: Mar 2013
Posts: 2,628
Likes: 30