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Pilot Bushing ? for the masses.

Discussion in 'Manual Transmission & Clutch' started by SquareRoot, Jan 4, 2021.

  1. DoubleDingo

    DoubleDingo Drain The Swamp, Completely

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    I still want to see the engine-side of one of these torque converters that need or utilize a pilot bushing/bearing.
     
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  2. SquareRoot

    SquareRoot Full Access Member

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    Turbo4whl,

    I'm with Dingo. I learned something today.
     
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  3. Ricko1966

    Ricko1966 Full Access Member

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    They look just like any other torque converter. Look at that bushing pic I put up.It goes in the end of a chevrolet crankshaft and holds the pilot end of a regular old th350 torque converter when you have a motor plate. The bushing is just there to make sure the converter is centered.
     
    Last edited: Jan 5, 2021
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  4. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    WTH? A bushing for a torque converter on a gen 1 chebby? Never hear of such a thing...
    A5C0A758-FBA1-4015-81F0-B9AF3D85A32F.jpeg BFE39031-A034-4619-A737-A5C65E3D48C6.jpeg
     
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  5. Turbo4whl

    Turbo4whl Supporting Member Supporting Member

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  6. Ricko1966

    Ricko1966 Full Access Member

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  7. Turbo4whl

    Turbo4whl Supporting Member Supporting Member

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    I read this post before your edit. You were right all along. Should have left the sleeping dog lie.
     
  8. DoubleDingo

    DoubleDingo Drain The Swamp, Completely

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    So basically the bushing, if needed, is only for centering on the crankshaft. For those that don't need a bushing, the nub that @Frankenchevy showed on the engine-side of his torque converter, goes in the hole where a manual transmission input shaft pilot bushing would go.
     
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  9. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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  10. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    Not even that. Your TC snout should fit perfectly to the back of your crank with no bushing. The small hole for the pilot is about 1/2 of the diameter of the TC snout. I’m holding a MT pilot bushing up to a TC snout.
    0DD01B83-2A53-42AA-9D91-CAD52770744A.jpeg

    here’s a brand new gen 1 TC and a 327 crank. Identical measurement.
    621A118A-27E5-40F5-8A68-B109C59E4BDB.jpeg
    8C0FB2A9-1761-410A-97E9-FDCB2F4AFF7C.jpeg
     
  11. Ricko1966

    Ricko1966 Full Access Member

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    The pic I put up was th350 to gen 1 small block with a motor plate so that bushing makes up the difference so the center of the the th350 can center in the sbc crankshaft. Factory automatic sbc/th350 never had one to the best of my knowledge.If the end of the crank or the pilot on the converter are damaged a bushing is an option for repair.Its only to locate the converter in the crankshaft to keep the centerline.
     
  12. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    The third pic I see in your post says LS...

    I must be looking at the wrong thing.
     
  13. Ricko1966

    Ricko1966 Full Access Member

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    Yea I put one of those up too.

    That little nub sticking out of your converter is called a pilot and it has to center in whatever crank you are using. So Cars with a motor plate need a bushing, different motor to different transmission combos sometimes need a bushing.Cars with damaged cranks or converters may have a bushing. And some manufacturers just bush them from the start .
     
    Last edited: Jan 5, 2021
  14. SquareRoot

    SquareRoot Full Access Member

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    Good job @Frankenchevy !

    Yes, there are bushings available but only in industrial applications or non-factory conversions made by the aftermarket. I still highly doubt bushings are used from the factory for engines and transmissions that were designed for production.
     
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  15. Ricko1966

    Ricko1966 Full Access Member

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    Jeep does
     

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