Results 1 to 10 of 10

Any opinions on what went wrong?

This is a discussion on Any opinions on what went wrong? within the Internal Engine forums, part of the LSx Technical Help Section category; I recently bought an '01 SS longblock. I got it from guy who is a tech at an Hyundai dealership. ...

  1. #1
    Junior Member
    Join Date
    Apr 2008
    Location
    FL
    Posts
    6

    Any opinions on what went wrong?

    I recently bought an '01 SS longblock. I got it from guy who is a tech at an Hyundai dealership. It came from his own car, and was warranteed out due to a supposed spun rod bearing. He said it was making a lower end noise, a light knock, so he pulled it. The alleged cause? A tear in the o-ring between the oil pickup tube and the block caused air to get into the oil/reduction of oil supply.

    When I inspected it before buying, we pulled some (but not all) of the rod caps. It looked like there was crap in the oil, and some of it got into the rod bearings. There was also a little bit of gritty looking stuff here and there, in the nooks and crannies of the crankcase. But things looked better than I was expecting to see, so I bought it and took it home.

    This weekend, I got it up to my Dad's shop and we tore into it. We pulled every rod cap, one at a time, and found no spun bearings. There was that gritty stuff inbedded in some of the bearings like I'd seen before, but the crank wasn't scored. This was a surprise, but I was worried that I'd find a spun main bearing. So we kept digging.

    Long story short:
    -Pulled the mains, none spun.
    -Pulled the heads, and there were no damaged pistons, though they looked like they weren't running 'clean'.
    -All the bores still have easily visible cross-hatching.
    -Oil pump had none of the gritty stuff in it.
    -Head gaskets were intact.

    So what gives? I looked around for signs of stuff rubbing where it shouldn't, foreign materials, etc... but I never found the source of the gritty stuff. We're not ever sure what kind of material it is, so Dad suggested we collect some of it up and at least see if it's magnetic.

    Next question: what should I watch out for when we decide to put it back together? I know the headbolts are TTY. What about bottom end fasteners? Rod bolts? Where can I get a good guideline for torque specs and rebuild procedures? Anything else I should look out for? Thanks,

    -Mike

  2. #2
    Member
    Join Date
    Nov 2007
    Location
    SATX
    Posts
    847

    Pewter
    2000 Trans Am

    i would wash every part with that solution and the brush on that blue bench thingy that spits out brownish hot water but cleans like hell, just to be safe

  3. #3
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    What did the thrust bearing look like? A failed thrust bearing is usually very easy to spot. They can not take the loads as connecting and main can. Check the surface of the crank where thrust bearing was.

    Was the engine ever built before?

  4. #4
    I lika da Chevy's LETHALxLS1's Avatar
    Join Date
    Oct 2006
    Location
    USA
    Posts
    5,329

    BLACK
    Z/28 LS1

    Did the knocking noise go away after the engine warmed up?

  5. #5
    Junior Member
    Join Date
    Apr 2008
    Location
    FL
    Posts
    6
    I didn't make note of anything odd on the thrust bearing, and it was supposedly original with 78k on it. I'm sure the thing had been run hard...I saw the guy at the track last night in the car that it came from. FWIW, the car was an auto.

    Lethal, I never got to hear it run, though he never told me if the sound went away at any time.

  6. #6
    I lika da Chevy's LETHALxLS1's Avatar
    Join Date
    Oct 2006
    Location
    USA
    Posts
    5,329

    BLACK
    Z/28 LS1

    I thought by some chance maybe it was piston slap but I think GM corrected that issue by 01 anyway.

  7. #7
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    Location
    Indy
    Posts
    6,712
    no my 2002 has p slap

  8. #8
    Junior Member
    Join Date
    Apr 2008
    Location
    FL
    Posts
    6
    You know, I wouldn't doubt it. I mean, the guys car was super, super clean, so I can't really imagine him being the type who would be OK with something like that.

    The fact that he's a tech, and his wife warrantied out the motor which he installed on the clock probably didn't hurt too much either. I think the guy got paid to take out an LS1 and put in an LS6.

  9. #9
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    Location
    Indy
    Posts
    6,712
    Maybe pay to have some nondestructive testing done to check for cracks to give you peice of mind. Sounds like you got a good hook up.
    04 C5 A4 Torch Red

    2009 CTS4 Ice Black

    2013 1500 Silverado Z71

    02 Z/28 M6 Onyx Black All Options - Sold

  10. #10
    Senior Member Orcus79's Avatar
    Join Date
    Feb 2006
    Location
    Canada
    Age
    38
    Posts
    1,346

    black
    2002 WS6

    its very possible that he know something went wrong early and was able to shut it down before any major damage was done. Like other have said tear it right down clean it up, drop in new bearings (including the cam) seems you didn't check that. Any grit is bad.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Wrong Place Wrong Time
    By Fearls1 in forum Firebird / WS6
    Replies: 42
    Last Post: 05-07-2010, 07:26 AM
  2. Was I wrong here?
    By knightryda01 in forum Almost Anything Goes
    Replies: 43
    Last Post: 07-15-2009, 12:00 PM
  3. Something wrong!!
    By dcarver07 in forum General Help
    Replies: 9
    Last Post: 03-28-2009, 03:28 PM
  4. Who is right? Who is wrong?
    By TX02TRANSAM in forum Wheels and Tires
    Replies: 3
    Last Post: 09-13-2007, 11:13 AM
  5. Is this wrong......
    By sassy in forum Almost Anything Goes
    Replies: 19
    Last Post: 01-26-2007, 08:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •