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crankshaft bolt

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  • crankshaft bolt

    Well.. i've had the crankshaft bold off earlier this year on my flathead 6. I"m trying to add a pulley to the front for a/c. I can't semm to get it off this time. I read the posts about putting window sash cord in the piston chamber to keep the pistons from moving so you can get leverage on the bolt to loosen it. With the flathead engine, the sparkplug hole is offset and the cord will not go in. Is there another way to get keep the engine from turning so the bolt can be removed?

  • #2
    Wedge a lever or pry bar between the flywheel teeth and the bell housing

    Bob Johnstone

    64 GT Hawk
    55 President State Sedan
    70 Avanti (R3)
    64 GT Hawk (K7)
    1970 Avanti (R3)


    • #3
      What Bob said, or if you are by yourself try an impact wrench. Or put it in gear with the parking brake on and 'jerk' it loose

      Jon Krimm
      1962 Lark Sedan

      1961 Champ


      • #4
        Don't go stickin stuff in the spark plug hole. That only stops the piston near top dead center. The angle of the rod journal is at a disadvantage to the rotation of the crank; putting severe pressure on the cylinder wall, piston skirt, wrist pin, and bearing. Worse on an OHV, it's a great way to bend a valve.


        • #5
          Impact wrench!
          Brad Johnson,
          SDC since 1975, ASC since 1990
          Pine Grove Mills, Pa.
          '33 Rockne 10, '51 Commander Starlight. '53 Commander Starlight
          '56 Sky Hawk in process


          • #6
            What Bob said and use your BEAR hands.


            • #7
              Place 6 point socket and breakover on bolt.brace free end of breakover on something solid(frame,floor,ect)may have to use pipe extension on handle of breakover.Take all slack out of tool by turning engine by hand on fan.remove coil wire,to insure it does not start.bump starter.