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  1. #1

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    Had main bearings seize up on an 07 4tec. Opinions wanted, is block toast?

    Anyone see any way I'm missing to fix this block? I thought about trying to "create" a thicker thrust bearing, but that's just not going to happen. I suppose I could try and add some metal back on, and grind it down, but it will probably warp the block if I try and weld on it.

    Anyone got any other ideas on how to fix this? Or if it's just complete toast? Or if I'm making the issue bigger than it is? (Doubtful ) Below are some pics of where the thrust bearing ate into the block, and seized. Also included some pics of the crank, I KNOW it's toast!

    Thanks guys!
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  2. #2
    dduck dduck1628's Avatar
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    Apr 2007
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    I've seen blocks repaired with a thermal spray process to build up the surface and then machined back to specification. I believe it called HVOF, High Velocity Oxygen Fuel

  3. #3
    West Texas RXP skoepp's Avatar
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    sorry to see that issue. So what are the possible culprits to this main bearing failure?

    Was this on one of your skis or an extra block you had??

  4. #4
    Ride Hard! aha's Avatar
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    Ouch! Hope this is not the ski that lost a valve.

  5. #5
    GTXX's Avatar
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    would you like butter or margarine? grape, mixed fruit, or strawberry?

  6. #6

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    Lexington, Ky
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    This is actually just a spare motor I picked up on eBay. It was a 155 NA motor that I paid like $337(no joke, I forget exactly, but it was under $400 after shipping) Which I guess Is why it went so cheap but oh well, the head was worth that! Not sure why it died probably lack of oil changes before I got it if I had to guess.

    Just going through all the crap in my garage. Since that block has been sitting in the corner for like 6 mo's figured I'd shoot some pics, see if anyone thought it was worth trying to repair.

  7. #7
    GTXX's Avatar
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    Quote Originally Posted by boostaholic View Post
    This is actually just a spare motor I picked up on eBay. It was a 155 NA motor that I paid like $337(no joke, I forget exactly, but it was under $400 after shipping) Which I guess Is why it went so cheap but oh well, the head was worth that! Not sure why it died probably lack of oil changes before I got it if I had to guess.

    Just going through all the crap in my garage. Since that block has been sitting in the corner for like 6 mo's figured I'd shoot some pics, see if anyone thought it was worth trying to repair.
    be sure to check the valve guides in that head if you think it was oil related.

    and the cam journals...
    Last edited by GTXX; 09-16-2009 at 10:32 PM. Reason: added to

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