C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

OK Guys, need some serious help!!

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Old Apr 15, 2008 | 05:19 PM
  #341  
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From: Glenbeulah Wi
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I hope I am not repeating something since I did not read every post. You only changed injectors, nothing else, and then you heard the load clacking noise. Are you sure the injectors are the same length and the o-rings sealing into the manifold are in the same position? If there is a leak at the o-rings you will hear the intake valve opening and closing and it will make a loud metalic clank when it closes.
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Old Apr 15, 2008 | 05:23 PM
  #342  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by bjankuski
I hope I am not repeating something since I did not read every post. You only changed injectors, nothing else, and then you heard the load clacking noise. Are you sure the injectors are the same length and the o-rings sealing into the manifold are in the same position? If there is a leak at the o-rings you will hear the intake valve opening and closing and it will make a loud metalic clank when it closes.
I went around with a fiber mallet and screwdriver and tapped the injectors all the way down to ensure they were seated.
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Old Apr 15, 2008 | 06:04 PM
  #343  
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Originally Posted by jsup
Just got back from the shop. They let me work on the car with them, they're good guys.

Id does not appear any of the rods are loose, whew...but he's dropping the flex plate as we speak.

No news yet.

It sucks that I don't have the time to do this myself, but better to have a car that I can drive than is sitting in the dam garage.

I should know by tomorrow.
Why would they drop the flexplate? remove the inspection cover, and shine a light up there. 10 minute job.
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Old Apr 15, 2008 | 06:10 PM
  #344  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by Pete K
Why would they drop the flexplate? remove the inspection cover, and shine a light up there. 10 minute job.
The intent is to move the flex plate away from the converter to see if the noise can be isolated. I said flex plate, I meant inspection cover.

I had the three of us standing under the car, the two of them with decades of experience each. None of us can tell WTF is going on.

The trans line had to be removed to get the inspection cover off because of the headers. The guy is completely methodical and I anticipate an answer tomorrow.
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Old Apr 15, 2008 | 07:11 PM
  #345  
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I'd bet there's something in one of the cylinders and that noise is the piston hammering it against the head. Its probably embedded in the piston and will require removing the head. If its small enough and didn't crack anything then its not catastrophic.
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Old Apr 15, 2008 | 07:21 PM
  #346  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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I'm not ruling it out
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Old Apr 15, 2008 | 07:46 PM
  #347  
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Id does not appear any of the rods are loose, whew...but he's dropping the flex plate as we speak.
Can you tell if the noise is comming from a particular area now, i.e. rear, lower, etc???
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Old Apr 15, 2008 | 07:48 PM
  #348  
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did you have any misplaced bolts/washers/tools that you had to use diffrent ones to complete the reinstall? if not then how is it possible to have something metallic down inside one of the cylinders.
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Old Apr 15, 2008 | 08:10 PM
  #349  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by 65Z01
Can you tell if the noise is comming from a particular area now, i.e. rear, lower, etc???
Not as of 5:00. Tomorrow I'll know. It's really hard to isolate.
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Old Apr 15, 2008 | 08:35 PM
  #350  
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Originally Posted by 85blkrose
did you have any misplaced bolts/washers/tools that you had to use diffrent ones to complete the reinstall? if not then how is it possible to have something metallic down inside one of the cylinders.
I had the strangest thing happen once during a head swap. After the heads were on, and the lower intake wastorqued on, I changed my socket. When I went to put the new socket on the extension, it did not lock on. The small ball with the spring behind it was missing. Hmmmm. Oh well, it must have fallen on the floor, I thought.
I looked for it, but could not find it. Rolled the motor over with a ratchet to set the valve lash, and WHAAAM, it locked up tight.
Pulled the heads and found the little ball had fallen into a runner on the base manifold, and dropped into the cylinder. When the pistonpushed the ball into the head, it became imbedded in the piston. I had to pop it out with a knife.
Long story short, anything can happen, and for me, it often does
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Old Apr 15, 2008 | 08:39 PM
  #351  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by Pete K
I had the strangest thing happen once during a head swap. After the heads were on, and the lower intake wastorqued on, I changed my socket. When I went to put the new socket on the extension, it did not lock on. The small ball with the spring behind it was missing. Hmmmm. Oh well, it must have fallen on the floor, I thought.
I looked for it, but could not find it. Rolled the motor over with a ratchet to set the valve lash, and WHAAAM, it locked up tight.
Pulled the heads and found the little ball had fallen into a runner on the base manifold, and dropped into the cylinder. When the pistonpushed the ball into the head, it became imbedded in the piston. I had to pop it out with a knife.
Long story short, anything can happen, and for me, it often does
Sounds like we have the same luck, all bad.
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Old Apr 15, 2008 | 08:58 PM
  #352  
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Originally Posted by jsup
Sounds like we have the same luck, all bad.
It didn't upset me that bad.
2 head gaskets, a lower intake gasket, and 3 hours time fixed it.
It could have been worse, I could have fired the motor and had some real damage
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Old Apr 15, 2008 | 09:20 PM
  #353  
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Expensive game of chutes and ladders.
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Old Apr 15, 2008 | 09:41 PM
  #354  
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Damned....can't wait to find out WTF is causing this damned racket
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Old Apr 15, 2008 | 09:49 PM
  #355  
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Originally Posted by 95BLKVette
Damned....can't wait to find out WTF is causing this damned racket
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Old Apr 16, 2008 | 01:31 AM
  #356  
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Originally Posted by jsup
I went around with a fiber mallet and screwdriver and tapped the injectors all the way down to ensure they were seated.
No
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Old Apr 16, 2008 | 08:06 AM
  #357  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by cuisinartvette
No
They were a little short, and I had to make sure they were seated. A little tap ensured they were seated. Something wrong with that?
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To OK Guys, need some serious help!!

Old Apr 16, 2008 | 10:11 AM
  #358  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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OK, here's what we know.

We turned the motor by hand and it was binding a bit. We took out the main berings on cyl #7 and turned it, and the binding went away.

We have come to the conclusion that something is in CYL#7

Rather than have the car towed home and do it myself, the pan is already off, he has the car, I told him to pull the head, and see what we're dealing with.

Based on the results, we will repair as necessary. Could be a piston, rod. Could be a head, valve, something else, we'll see.

We are not expecting that the cyl walls are abused or damaged.
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Old Apr 16, 2008 | 10:18 AM
  #359  
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Originally Posted by jsup
OK, here's what we know.

We turned the motor by hand and it was binding a bit. We took out the main berings on cyl #7 and turned it, and the binding went away.
.
What? You removed he bearings from the #7 rod?

-- Joe
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Old Apr 16, 2008 | 10:31 AM
  #360  
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
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Originally Posted by anesthes
What? You removed he bearings from the #7 rod?

-- Joe
Took the bearings off the crank, then rotated the motor again. Slowly, by hand. no more binding.

Last edited by jsup; Apr 16, 2008 at 10:36 AM.
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