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is it neccessary to have a pilot bearing/bushing

Discussion in 'The Garage' started by GMC500, Nov 9, 2006.

  1. GMC500

    GMC500 1/2 ton status

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    hi all

    after inspecting my truck, I found that it only has a throw out bearing and no pilot bearing/bushing

    is it neccessary to have a pilot bearing/bushing ?
    and what is their advantages ?

    truck is a 1986 GMC k15 with SM465
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    yes it supports the nose of the input shaft in the back of the crankshaft, are you sure that you do not have one that you just missed?
     
  3. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Yeah, I'd say it is! It keeps the shaft roating without any wobble, which would kill the input bearing pretty quickly...
     
  4. GMC500

    GMC500 1/2 ton status

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    can you please post a pic of a pilot bearing/bushing installed in the crank
     
  5. pvfjr

    pvfjr 1/2 ton status

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    This is what the bushing looks like. The hole in it for the tranny input shaft is just a little less than 5/8". The hole that would be in the crank if there was no pilot bushing would be much larger, and you would have bad chatter issues with your clutch/tranny. If you're looking at it wrong, it might look like part of the machining of the crank. Hopefully you're mistaken. No bushing would be very bad.
    [​IMG]
     
  6. GMC500

    GMC500 1/2 ton status

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    thanks

    I will check it tomorrow before droping the engine
     

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