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Think I spun a rod bearing!!!

This is a discussion on Think I spun a rod bearing!!! within the Internal Engine forums, part of the LSx Technical Help Section category; Ok here is the quick run-down. I got my car back after it was stolen (6,300$ in damage later ) ...

  1. #1
    Junior Member yanoZ28's Avatar
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    Think I spun a rod bearing!!!

    Ok here is the quick run-down. I got my car back after it was stolen (6,300$ in damage later ) and i was hearing this tapping and knocking coming from the motor. My buddy told me sounds like a bent push rod, so i replaced them all, and it turns out one was bent all to H*LL!

    We fired her back up after the new push rods we put in, and she sounded great... and then bout a min later we heard it. A knocking coming from inside the motor, diff sound than before too The knock is most noticable from under cylinders 2 and 4.

    I fear that i have the dreaded spun rod bearing, but not too sure.
    HELP PLEASE!!
    '01 Z28 A4 : SLP lid, smooth bellow, K&N, UMI strut brace... Under Construction, Much more to come
    Best ET: 13.02

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    Senior Member bills98ta's Avatar
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    Might be a bent valve too, the one that hit the piston to bend the push rod. Did you do a compression test on the cylinders ? If the valve is bent, it will be low. And, it might have collapsed the lifter as well.

  3. #3
    Senior Member bills98ta's Avatar
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    PS - If the valve is bent, you should hear it in the TB or exhaust.

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    Junior Member yanoZ28's Avatar
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    Yeah when the rpms are dropping, i can hear this half knocking, half taping sounds from the exhaust... is that what ur refering to?

  5. #5
    Senior Member bills98ta's Avatar
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    I'd rather hear it myself, but maybe... Do a compression test and see if that one reads low. Still be pulling it apart.

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    Junior Member yanoZ28's Avatar
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    Im going to post a vid on here tomorro, think you could tell me something i dont know?
    Last edited by yanoZ28; 10-27-2009 at 07:46 PM.

  7. #7
    Senior Member bills98ta's Avatar
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    I will try !!! Some others might chime in too.

  8. #8
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    to check for a bent vavle put a air hose in spark plug hole and see if you hear air coming out of the tail pipe you must remove all the rockers first so all the vavles are close

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