Sheared the brass bolt in a carb

Discussion in 'Outboard Maintenance' started by DLBjaxbeach, Dec 26, 2014.

  1. DLBjaxbeach

    DLBjaxbeach Well-Known Member

    71
    2
    333
    I am rebuilding the carb on a 98 25hp mariner. I just sheared off the brass bolt that holds the ball valve in the primer assembly. Any tips on removing the part that is left in the carb? Ugghh.
     
  2. AfterHours2

    AfterHours2 Stripper in my own Mind!

    2,546
    136
    918
    Can you get a picture posted? If it is not broken off at the base, you may be to either try a easy out or Dremel a notch across so you can back it out with a flathead screwdriver..
     

  3. DLBjaxbeach

    DLBjaxbeach Well-Known Member

    71
    2
    333
    Thanks After. It sheared off flush with the surface. I am going to try an easy out tomorrow when I can get one at home depot. Until then I am soaking it with PB blaster...we will see.
     
  4. jmrodandgun

    jmrodandgun Well-Known Member

    1,469
    934
    718
    The hard tool steel of the easy out will just force the soft brass to expand in the hole. I predict the next thread to be "broken off easy out in aluminum housing." Those things are a pain in the dick. I've seen them work exact twice. Ever.

    If it's broken off flush, then slot the broken bolt and try to take it out with a screw driver. If it's just too deep to slot without destroying the housing, then try a small punch to drift it out.

    What kind of tools do you have access to? If you have access to an end mill then  use a carbide drill center to make a center dimple (those things are the tits) and just drill the brass out to 75% the thread depth.  A tap should just peel out the old screw threads from the aluminum. A plug tap is better than a taper tap for this mess and It is better at catching the old threads.
     

    Probably less of a headache to just buy a new part.
     
  5. AfterHours2

    AfterHours2 Stripper in my own Mind!

    2,546
    136
    918
    If it's flush then I would honestly try to notch it and remove with a screwdriver first. Brass is very soft and won't take much to remove. I've done this many times in the past with air/fuel mixture screws. Only issue with trying the easy out first is that if it doesn't work then the notching can't be done. Best of luck..
     
  6. DLBjaxbeach

    DLBjaxbeach Well-Known Member

    71
    2
    333
    So, ItsnotLupus, you win the prize for closest to the actual prediction. Except the easy out didnt break. It grabbed real good. So good in fact that it expanded the brass insert and broke the aluminum housing all to hell. Sooo time for a new carb bowl. That brass was absolutely fused to the aluminum. The end mill routine would have worked. (Don't have one of those in the garage.) Anything short of that was bound to end this way. Sure glad I have a parts motor sitting 10 feet away.