LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Pics of #3 rod bearing

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Old Jan 13, 2006 | 06:33 AM
  #1  
Jeff95TA's Avatar
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Pics of #3 rod bearing

Mystery metal:
http://home.comcast.net/~jsaccani/DSC02120.JPG

#3 rod bearing removed:
http://home.comcast.net/~jsaccani/DSC02122.JPG

Finish on crankshaft (#1 vs #3):
http://home.comcast.net/~jsaccani/DSC02126.JPG
Old Jan 13, 2006 | 07:42 AM
  #2  
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Re: Pics of #3 rod bearing

That's some carnage.
How long did you run the car after it happened or what were the circumstances behind its failure....RPM, Lack of Oil Pressure?
Old Jan 13, 2006 | 07:46 AM
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Re: Pics of #3 rod bearing

Also, what kind of noises did it make? Were they quite noticable?


Thanks
Old Jan 13, 2006 | 09:57 AM
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Re: Pics of #3 rod bearing

The car started to stall when I would come to a stop. I figured it was an EGR issue since I had been getting a code for it. Drove it to diagnose the EGR, stalled at a stop sign, didn't want to crank to good, drove it about a half mile home, started to rap like a rod bearing, and parked it.

Oil pressure was never really bad. It was always a little low at idle since the new cam, but it never dropped to zero. I'm sure there was damage occuring before this major failure, I just didn't see the signs.

Pretty neat the way it extruded the bearing. Neat as in interesting and expensive.
Old Jan 13, 2006 | 10:09 AM
  #5  
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Re: Pics of #3 rod bearing

Yeah...from the pics it looks almost like the babbit (sp?) detached from the steel backer.
I know mine went really quick when it let loose.
I might have idled mine for a total of 20 mins to diagnose the issue and when i took the bottom end apart the #4 rod bearing was paper thin.
Old Jan 13, 2006 | 10:40 AM
  #6  
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Re: Pics of #3 rod bearing

Yea when my bearing went, no loss in oil psi, but the car would stall. Rod knock like a bitch.
Old Jan 13, 2006 | 10:47 AM
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Re: Pics of #3 rod bearing

You know my car did the same thing after a cam install i jerked that motor out and re-ringed another short block i had and it did the same thing stalling and cranking slow my bearing didnt look that bad but i knew it spun another bearing come to find out the piece of crap oil cooler plugged up and was hitting by-pass putting un filtered oil back in the enigine.I removed the oil cooler and put a standard truck oil filter on and BAM i had 70 psi of oil pressure ive never had that much.The damage was done to i got to build a 355 forged motor out of the deal i tell you what if you have that oil cooler get rid of it!!!The fins are so small in it that if you get any amount of debris in your motor the filter wont catch anything it will all accumulate in the cooler sorry so long want to save you the grief i had
Old Jan 13, 2006 | 11:17 AM
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Re: Pics of #3 rod bearing

Get a GOOD quality brg(Clevitte "H" series) to rebuild with.
Your old ones are typical of the "soft" brgs that "beat"out under a load.
Old Jan 13, 2006 | 11:25 AM
  #9  
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Re: Pics of #3 rod bearing

that sucks
Old Jan 13, 2006 | 01:02 PM
  #10  
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Re: Pics of #3 rod bearing

Originally Posted by Jeff95TA
stalled at a stop sign, didn't want to crank to good

Oil pressure was never really bad.
Those were the symptoms I saw as well, those pictures are painful
Old Jan 13, 2006 | 04:23 PM
  #11  
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Re: Pics of #3 rod bearing

Originally Posted by 1racerdude
Get a GOOD quality brg(Clevitte "H" series) to rebuild with.
Your old ones are typical of the "soft" brgs that "beat"out under a load.
Everyone seems to use the Clevite "77" bearings. Are the "H" series different?

edit: never mind, found that the H series are a type of "77"

Last edited by Jeff95TA; Jan 13, 2006 at 04:29 PM.
Old Jan 13, 2006 | 05:26 PM
  #12  
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Re: Pics of #3 rod bearing

Originally Posted by Jeff95TA
Everyone seems to use the Clevite "77" bearings. Are the "H" series different?

edit: never mind, found that the H series are a type of "77"
The "H" is the grade and type of brg. Ya can get cheap "77"'s but they won't do the job,good for a 6cyl grocery getter.
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