Crank Up

Discussion in 'Discussion' started by Numpty1, May 23, 2022.

  1. Numpty1

    Numpty1 Member

    A few pics of a crank up I attended on Sunday, held at Coultershaw Heritage Site nr Petworth. The weather gods did us proud, although perhaps the wall to wall Sun was a bit too much for punters, preferring to stay at home for a Barbe! I took a mates little *art that played up by flooding the carb. Anyone had this problem before?

    upload_2022-5-23_19-19-22.jpeg upload_2022-5-23_19-19-22.jpeg upload_2022-5-23_19-19-22.jpeg upload_2022-5-23_19-19-22.jpeg upload_2022-5-23_19-19-22.jpeg upload_2022-5-23_19-19-22.jpeg
     
  2. petternut

    petternut Administrator

    Thanks for the pics Mark. A common fault with several possible causes. Was it just overflowing or blowing out round the drain rod?
     
    chas likes this.
  3. Numpty1

    Numpty1 Member

    Roland,
    both, it was blowing out round the drain pin that prompted me to take the cap off and found the bowl was full. Lifting the drain and letting the excess out, it was clear the overflow was not keeping up with the pump. It did not start out like this but developed during the day. Now the grey cells have kicked in, it did the same last time it was taken out with its owner in charge then ;-) but the mag died as well. Ive replaced the mag with a 'loan' item but forgot about the fuel issue.
    Thanks Mark
     
  4. petternut

    petternut Administrator

    There are holes near the bottom of the brass tube inside the carb and these, or the central hole in the brass T fitting, can block. However its more likely that air is getting into the fuel.
    Two possible causes of air in the fuel:
    Most likely the diaphragm has one or more pinholes or a pipe or joint is split,
    or less likely the ball valve between atomiser and carb is not sealing or is sticking.
     
    chas likes this.
  5. Numpty1

    Numpty1 Member

    Thank you Roland, that gives me confidence to know where to look, I guess I'd better do it now before the engine goes back into hibernation and its forgotten again!.

    Thanks again Mark
     
  6. Skankin_giant

    Skankin_giant Well-Known Member

    Thanks for the photos Mark. There is some interesting stuff there.
     

Share This Page