badmfkr

iTrader: (4)

I reading here that crank bearing failure is common on the LS1 if it happens then the engine seizes ruining the block right?

before a bearing failure are there any signs like will the engine make noises like giving you clues that a bearing is loose and is about to fail?

Thanks

theinstag8r

iTrader: (3)

The only little clue was my oil pressure being sub par after my head/cam swap with new ported ls6 pump. It will make a noise you will never forget. kinda of like a belt squeal with a knock. I was at a stop sign when mine spun. coasted home with the motor off as much as possible. only ran the motor maybe 1 min after it spun. killed 2 bearings and the 2 rods. one journal was chewed up .100 lower on one side to the other. On a happier note my motor got rebuilt and is being installed right now.

badmfkr

iTrader: (4)

It will make a noise you will never forget that was just before the failure right?

sorry to hear that.

Mine has been making a funny noise when cruising at a low speed when the trans. A4 shifts up to a higher gear and the RPMs go way down press the gas litely I hear a noise.

I think I ruieded my AC sys. see when I installed my cam in the driveway I released all the freeon from the AC sys. did'nt know to seal the lines w/ tape
cam install took 4 days because it rained 2 days was informed that moisture got into the AC sys. and will ruien the dryer and compressor.it's been a few years and it still makes this funny noise.

also did you center you're oil pump w/ feeler guage during you're cam swap?

Thanks

JFM-jr

iTrader: (23)

Your speaking of rod bearings correct?

badmfkr

iTrader: (4)

not absolutely sure either crank bearing or rod bearing.


Mine has been making a funny noise when cruising at a low speed when the trans. A4 shifts up to a higher gear and the RPMs go way down press the gas litely I hear a noise.

I think I ruieded my AC sys. see when I installed my cam in the driveway I released all the freeon from the AC sys. did'nt know to seal the lines w/ tape
cam install took 4 days because it rained 2 days was informed that moisture got into the AC sys. and will ruien the dryer and compressor.it's been a few years and it still makes this funny noise.

thanks

Cowboy97

iTrader: (3)

I've never had it happen on an LS motor but did on a standard block motor. There was no warning for me, just all of the sudden the oil pressure dropped and the truck started running like crap. That was on a 6 month old proffesional rebuild that the only thing they think it was caused by was an severely out of balance converter and a bad tranny rebuild.

White.Lightning

iTrader: (53)

I'm having a weird noise that sounds more internal engine related than accessory/pulley related. It will happen at low speeds and when I come to stop light. Sounds like a pulley type noise that goes away as I pull away from the light. I don't think it is a slave/throw out bearing noise that is traveling, nor do I think it is an accessory/pulley problem.

Things I have done to diagnose the issue:
*Pulled A/C belt to eliminate that system- noise still occured
*Put trans (T56) into neutral, clutch pedal in, clutch pedal out, in gear- noise still occured
*Replaced serpentine tensioner pulley

Areas I feel the noise could be coming from:
*Internal bearing of some sort
*Power steering pump
*Water pump

Thoughts?!?!?!?

VeTTeMaNC486

I've never spun a bearing on a gen3 or gen4 motor but did in my 86 vette. My oil pressure was extremely low once it got hot (that cars fans cut on at like 230-235!!) and the oil pressure warning light would come on if I was just sitting there idling. It ran between 7-10 psi fully warmed up in the summer with 5w-30. Was like this a couple of months and one day on the way home it just shut off and when i restarted it was knocking. number 6 rod bearing and the crank journal on that side was completely toast.

my knock was not a squeeling like some people describe, it litterally sounded like a mechanical knock. like someone taping on the block with a piece of metal

White.Lightning

iTrader: (53)

I went out yesterday and pulled the serpentine belt and spun all of the accessories by hand. I could not replicate the noise. So this should eliminate the power steering pump and water pump. I know it is not A/C related because I pull that belt and drove the car around and the noise was still there.

Any thoughts? I'm just going to keep driving the thing until something breaks or I get some feedback for diagnosing the problem.

White.Lightning

iTrader: (53)

Alright lets see if this works. I got a video of the sound.

This video I heard the noise, let it sit in car for a sec, then put the camera under the car. It sounds like a faint vortech suprcharger type sound haha

http://smg.photobucket.com/albums/v7...rent=InCar.flv

And this video I actually captured it outside the car and in the engine bay. Sorry it was dark out but at least I got it. You might have to turn your speakers up a little.

http://smg.photobucket.com/albums/v7...ngineNoise.flv

Let me know what you think

Thanks,
Andy

nauticalstar2012

iTrader: (-1)

whitelightnin-I may be crazy or my speakers arent very good but i dont hear any thing that sounds like a spun bearing when i watched either videos. I spun a rod bearing in last ls1 and it made a knocking tapping noise. Yours sounds like a light metal scratching if anything. Are you sure you have a spun bearing and not a strecthed timing chain rubbing the cover or a rocker arm/valve spring broken? I am just reaching on the diagnoses it could be anything

RockinWs6

Ever solve this noise? I have the same problem.

Jimbo1367

I realize this isn't a LS, but a few yrs ago, My freshly rebuilt 396 made noise after I got it back form servicing it. Before service, I never noticed it as the lifters needed adjusting. It turned out to my muncie needed rebuilding.

My point is.. it maybe something you don't expect. FWIW

RockinWs6

Mine was diagnosed as air in the lifters from the oring leaking air. BUT since the OP has the EAXCT same trouble I wondered if he ever fixed it or if it stayed the same without and damage. I'm not looking forward to paying the shop 600 bucks to replace the oring.

I added a little STP oil treatment to my oil and it stopped the noise almost completely. It is without a doubt lifter noise.

White.Lightning

iTrader: (53)

https://ls1tech.com/forums/eastern-m...eo-inside.html

This was my problem. Read through the whole thread. There are links and pictures within.

RockinWs6

I didn't mean you...I meant the OP. But thanks. You have a completely different problem. My noise is just like the OPs EXACTLY.

Busted Knuckles

I know this is an old thread, but...
No engine will run for very long with low oil pressure/bearing clearance issues. There's no such thing as a "little bit of bearing clearance problem" - when the crank actually touches the bearing, it starts the microwelding process which doesn't take long to finish itself. They don't make a "little" noise for a long time while you're still driving it. More of a tic-tic-tic-knock-knock-knock.....silence.....except for the 4-letter words that fill the air.

RockinWs6

You didn't read the entire thread.....the op or I do not have low oil pressure

SSellers

Do an oil change and send a sample out to Blackstone for a $25 analysis. I do it every change on some of my cars.
http://www.blackstone-labs.com/free-test-kits.php

badmfkr

iTrader: (4)

Sorry Guy's for the slow response.

I don't drive the car that much, but intend on keeping it for a long time.

I've owned the WS6 for 13 years and dam all the funny noises, squeakes,rattles ect. a car can make this one doe's.

White.Lightning I'm not a expert mechanic but I've been around and modding cars for well over 25years, you Sir have a unuasalle sound from you'r engine I bet my $ it's not internal and there's nothing to worry about,

it's probablley a lose nut trapped inside the engine compartment.

when I first changed the plugs on mine I broke one of the rear Pass side plugs in half never could find the broke off half, however sometimes when blasting down the the expressway I will hear small part falling off HA HA.

These F-bodys are kindof strange I've been stuck off road and packed Georgia red clay inside the rear frame it dried and was like a rock bounceing around took years to fingure that noise, then I had a big bolt loose somewhere inside the fenders only heard it when going over a speed bump dam.

I currently have a loose valve stem bolt loose inside the tire only hear it when moving slow.

I will not mention all the squeakes from the poly bushings and loose heat heat shields I'm to lazy to track down, dam.

The sound I was initially hearing I'm convinced was from the A4 trans. being under strain like when it automatically upshifted during low speed RPMs dropped, I wanted to go well before the trans could downshift it strained thus the noise.

I'm sure you've looked hard do you have a telescopic magnet, get under there and fish around for loose ****.

The Guy's offered good advice however I don't think it's valve train or it would have seized a cylinder.


This may sound wierd but maybe a crusie down a bumpie dirt road will disslogde the **** that's bouncing around. I seriously don't think you have internal engine damage.

This a old thread my noise has'nt bothered me and I'm still beating the **** out of this car and loving it.

Back in the day a friend of mine was a shop foreman at the Pontica dealership I meat him though having the same car he was a very smart mechanic and could tell you exactly what was wronge w/ the car just by the noise cruise by a few places and let them have a listen not a test drive.

good luck, if you resolve the noise post up the results.

BTW White.Lightning nice looking TA.