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Thread: Engine help needed

  1. #1
    sigmapiox is offline Cadillac Owners Member
    Automobile(s): 2005 CTS
    Join Date
    Sep 2010

    Engine help needed

    so im rebuilding my 2.8 engine. original plan was to replace pistons and connecting rods. after having them checked out they are good (just need new bearings and rings). issue is since Iwas planning on getting new ones I did not mark them.

    so my issue is now is there anyway to tell which one goes where.. they all have numbers stamped on lower end of rod but I cant find anywhere what those numbers mean.

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  3. #2
    briggy's Avatar
    briggy is offline Cadillac Owners Enthusiast
    Automobile(s): CTS 3.6L 2005 80,000 Miles
    Join Date
    Dec 2009
    Southern California

    Re: Engine help needed

    The traditional reasoning for keeping the rods and pistons matched is to maintain wear patterns. With respect to the rods and pistons if the clearances are within spec, end play etc you are ok. Assuming you are installing new rings (which you should) and you are honing the cylinder sleeves you should be ok if he pistons aren't in the same cylinders. You will need to verify this. The most important components to match will be the upper and lower halves of the connecting rods at the main bearings these must be match if not you will need to buy new ones.

  4. #3
    aviatordave is offline Cadillac Owners Fanatic
    Automobile(s): 2007 CTS, 1976 Seville (sold)
    Join Date
    Apr 2013
    San Antonio

    Re: Engine help needed

    conventional wisdom is to keep pistons, rods and end caps matched and re-assemble back in the bores they came out of. not sure these engines have pushrods (yeah, I know - showing my age) but pushrods have to go back in their respective holes too.

    I concur with Briggy - you'll need new rods and end caps.


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