What's that sound?.....

[aggieguy713]

Sorry to keep you guys in suspense, been away for a while. Sadly, took it to a friends shop, listened and watched for about an hour, and finally concluded it wasnthe thrust bearing in the engine. Result of a
Bad crank. Was also causing the harmonic balancer
To move forward when the clutch was pressed in. Way more then it should have. (talk about bad luck). Got the engine out, just gotta get a crank and put it back together.
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[snaus32]

Originally Posted by Mr Chevorlet

I know this is going to sound crazy, but i had a loud squealing noise on a fresh rebuild and it was driving me crazy. It took me a couple of hours to figure it out. And what it was i had all my breather holes on the valve covers blocked and the squealing noise was comming from the dipstick tube. and when i pulled the dipstick out it went away. Bottom line engine was creating to much vacum in the block.I put a breather cap on and never heard it again. This might be your case. but it happens

I had the exact same problem this year after my 327 rebuild! Breather fixed it

[GASoline71]

Originally Posted by aggieguy713

Sorry to keep you guys in suspense, been away for a while. Sadly, took it to a friends shop, listened and watched for about an hour, and finally concluded it wasnthe thrust bearing in the engine. Result of a
Bad crank. Was also causing the harmonic balancer
To move forward when the clutch was pressed in. Way more then it should have. (talk about bad luck). Got the engine out, just gotta get a crank and put it back together.
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You'll need to completely tear it down and get all the metal flakes out of it that the thrust bearing put in the oil passages and such. Did you break it in with ZDDP additive and as the cam manufacturer recommended?

Gary

[aggieguy713]

Originally Posted by GASoline71

You'll need to completely tear it down and get all the metal flakes out of it that the thrust bearing put in the oil passages and such. Did you break it in with ZDDP additive and as the cam manufacturer recommended?

Gary

Yeah, we looked, therewernt many flakes, but i will double check and look over everything. Yes, the lunati tech reccomended a special type of break in oil, i forget the name. Just a bad crank, unfortunatley.
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[GASoline71]

If there are ANY flakes in the engine. They need to be washed out. Don't just check it and call it good. Or you'll be doin' this all over again very soon.

Gary

[Jessechop]

Might I ask how you concluded it was a bad crank? There are so many variables that go into a problem like this, oil pump, pickup height, oil viscosity, dirt, inproper torque and on and on. Just wondering if there is a more tell tell sign of a truely "bad crank"

[70STOVEBOLT]

Was the crank end play checked when the engine was built? If not, it's possible the side thrust surface on the crank could have been worn excessively. I would make sure to check the thrust surface on the block as well to make sure you don't have the same problem if you just replace the crank and reuse the block. Pull all the oil galley plugs and either clean them out with long brushes or blow them out with compressed air. The oil filter won't catch every piece of metal debris, so anywhere there was oil, there will most likely be debris also.

[mpotts64]

My '68 had a squealing noise on a new 283 with less than 600 miles, but it would only do it once in a while, come to find out the small yellow second wire to the starter had broken and then it would get against the block or starter and engage the starter while it was running, make a terrible noise, make sure your starter is not engaging, I taped it up and run it with the one main wire to the starter, no more problems

[aggieguy713]

Originally Posted by Jessechop

Might I ask how you concluded it was a bad crank? There are so many variables that go into a problem like this, oil pump, pickup height, oil viscosity, dirt, inproper torque and on and on. Just wondering if there is a more tell tell sign of a truely "bad crank"

As i said, when the clutch was pressed in, it would cause the harmonic balancer to move forward about an inch. Only could mean one thing, bad thurst bearing. The crank we were told was good, and was fine to re use when we rebuilt. So we left it, bad idea. When we pulled the oil pan, it was more beat up then my truck was when i first got it. haha. We had a friend of mine, he rebuilds engines for a local performance shop lend us a hand. So that made it a bit easier.

[aggieguy713]

Originally Posted by 70STOVEBOLT

Was the crank end play checked when the engine was built? If not, it's possible the side thrust surface on the crank could have been worn excessively. I would make sure to check the thrust surface on the block as well to make sure you don't have the same problem if you just replace the crank and reuse the block. Pull all the oil galley plugs and either clean them out with long brushes or blow them out with compressed air. The oil filter won't catch every piece of metal debris, so anywhere there was oil, there will most likely be debris also.

Block was fine. There were HARDLY any, im saying, like 2 or three flakes at all, the thrust bearing was just bent-beat up from the crank.

[68gmsee]

Originally Posted by aggieguy713

As i said, when the clutch was pressed in, it would cause the harmonic balancer to move forward about an inch...

Wow! One inch movement is a lot. Something definitely not right.

[Frkypunk70]

I found metal once in my pan, it was from a worn lifter and cam. I rebuild the top end and flushed the engine thinking "how bad could it be" the engine lasted a total of 50 miles. Point is I never want to see metal in my pan. Just food for thought.
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[biggestjohn]

Originally Posted by 68gmsee

Wow! One inch movement is a lot. Something definitely not right.

There is no way that a Harmonic Balancer can move an inch from the crank moving. If the crank moved that far, the rods would be garbage!!! Besides, there is not enough room between the mains and the crank to move like that. I would take a serious look at the harmonic balancer if its really moving like that.

[aggieguy713]

Originally Posted by biggestjohn

There is no way that a Harmonic Balancer can move an inch from the crank moving. If the crank moved that far, the rods would be garbage!!! Besides, there is not enough room between the mains and the crank to move like that. I would take a serious look at the harmonic balancer if its really moving like that.

Not a whole inch, but avery significant amount none the less.
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