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Thread: Crankshaft thrust bearing

  1. #1

    Default Crankshaft thrust bearing

    Paul,

    What's your opinion of the new 180 degree style 2 piece #3 engine main thrust bearing?

    Is this the weak link that is causing many engines to develop excessive crank end play, and in a few cases throwing a connecting rod through the block?

    Have you been able to develop any information that led the engineers to depart from the time proven 360 degree thrust face on the bearing? The full 360 bearing has seen universal use for over 100 years.

    I waited for the 2015's to be released before ordering, hoping that most bugs would be worked out. I now have a Silver, Z51, convert ordered, and I'm starting to see more incidents reported of thrust bearing failures. I'm aware of the torque tube re-installation issue causing some failures, but most of the failures I'm hearing about have had no prior power train work done.

    I have never seen this many failures of the same internal engine part in such a short period of time. So what's your take on this? Has the design been changed in mid production, should I take my chances, should I cancel my order?

    I've spoken with you on several occasions at Carlisle, and get in on your seminars there. I admire the time you have invested in staying up on the latest developments with the Corvette, and would like a straight forward appraisal on this new style bearing.

    Thanks for your time,
    Ed

  2. #2

    Default

    HI there,

    Actually, the 180 thrust bearing has been out for years on many different types of engine, including Corvette.

    This is actually nothing new and has been proven reliable for many years.

    The reason I have been told for the design change on many different engines is frictional losses.

    I wouldnt worry at all.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

  3. #3

    Default

    Quote Originally Posted by c4c5specialist View Post
    HI there,

    Actually, the 180 thrust bearing has been out for years on many different types of engine, including Corvette.

    This is actually nothing new and has been proven reliable for many years.

    The reason I have been told for the design change on many different engines is frictional losses.

    I wouldnt worry at all.

    Allthebest, Paul
    Thanks Paul,

    I was under the impression that this bearing was new to the 3rd generation LT1. My Helms manual shows my LS3 to still be of the 360 degree design. Vette magazine also declared it to be new to the LT1 in their October, 2014 issue in their article titled warp speed.

    I'll take your word for it since I'm not about to drop the pan on mine to find out. It's up for sale at the moment, and if it doesn't sell by the time my 15 comes in I'll just trade it in. I already got a fair trade-in commitment from my dealer, but I'm trying to milk every penny I can out of it.

    Thanks again,

    Ed

  4. #4

    Default

    HI there,

    What is new is the bi polymer coating on the bearings, NOT the 180 thrust design.

    These bearings are of a new construction material wise but are NOT new from the thrust surface being only on one side of the bearing half.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

  5. #5
    Join Date
    May 2017
    Posts
    1

    Default

    Quote Originally Posted by c4c5specialist View Post
    HI there,

    What is new is the bi polymer coating on the bearings, NOT the 180 thrust design.

    These bearings are of a new construction material wise but are NOT new from the thrust surface being only on one side of the bearing half.

    Allthebest, Paul
    Interesting Paul, what are they made of?

  6. #6
    Join Date
    Jun 2017
    Posts
    4

    Default

    Didn't have a good mag glass but did check with a good light and two sets of glasses. All looked pretty clean. Sprayed them with CRC 2-29, blew it dry and sealed with dielectric grease. So far , so good.




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