273 Crank Shaft Pilot Bearing Solution

Manual Transmission & Clutch Discussions

  1. jonn6464

    jonn6464 1970 Duster FABO Gold Member

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    Hey FABO,

    If anyone is interested...

    I had the machinist at my work turn down the pilot bearing, that would normally go into a small or big block crank shaft, to fit the smaller 273 journal.

    Size is 1.556"

    It tapped in with a socket over the face of the bearing. It is nice and snug.

    We weren't sure what we'd find once he started taking material away, but it turns out to just be a solid race around the needle bearings. At least, it is solid up to the 1.556" point.

    upload_2022-5-2_10-34-19.png upload_2022-5-2_10-35-41.png

    upload_2022-5-2_10-36-1.png

    upload_2022-5-2_10-36-22.png
     
    Last edited: May 2, 2022
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    • toolmanmike

      toolmanmike Moderator Staff Member FABO Gold Member

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      Nicely done. I will make this thread a sticky.
       
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      • gzig5

        gzig5 Well-Known Member

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        Cool! I have a 273 crank I may be putting into service and can use this trick. So it's just an INA needle bearing pressed into a larger solid hub...who'da thunk it?
         
      • KosmicKuda

        KosmicKuda FABO Gold Member FABO Gold Member

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        @jonn6464
        Would you happen to have the P/N of the bearing you used?
         
      • jonn6464

        jonn6464 1970 Duster FABO Gold Member

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        FC69907.1
         
      • Charrlie_S

        Charrlie_S Well-Known Member

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        Just a FYI. This should work for the 60-67 slant six, also.
         
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        • slant six

          slant six Do More With Less

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          Cool Stuff Jonn, and Charrlie.

          Yes good for the Small Pilot Slants as well.
           
        • KosmicKuda

          KosmicKuda FABO Gold Member FABO Gold Member

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          I just did this on my 1964 /6.

          One thing to note, john6464 installed his bearing backwards, the lettering should face out because there is a lip seal built into the bearing. (See pic) It is packed with grease and the lip seal helps keep the grease in place.

          I used an actual input shaft as a disc alignment tool and it actually made a suction sound when pulled out.

          Also, mine measured a heavy 1.656 after I turned it down, maybe 1.6565. The press fit was a little on the heavy side. I would recommend a range of 1.656/1.655. This doesn't require a real extreme interference fit. Using a snap gage, my bore measured 1.653/1.654. The material is powdered metal so it comes off in powder form, not shavings.

          I'm very happy with the result!

          20220609_183625.jpg
           
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          • jonn6464

            jonn6464 1970 Duster FABO Gold Member

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            I didn't know about the lip seal on the bearing. O thought the letters facing out was due to the tapered edge. But since that was gone once the bearing was turned down I didn't think it mattered. Now I know.
             
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