Webra TruTurn Adapter Bushing Problem (more info)

[David Flynt]

MessageI just looked at my new 1.45 red head and new TT adapter (TT-0825-A).
The bushing slides down without any resistence. The non-threaded area of the
shaft on the Webra is 0.311-0.312 inches in diameter; the ID of the bushing
is 0.315 inches.

David Flynt
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Keith Black
  Sent: Wednesday, January 08, 2003 1:31 PM
  To: discussion at nsrca.org
  Subject: Re: Webra TruTurn Adapter Bushing Problem (more info)


  I have some more info on the bushing problem.

  I also have a Bully 1.45 that I bought new at the same time as the Webra.
It is on another plane but I've never mounted at TruTurn spinner on it. I
just tried the bushing on it and it fits fine, in fact it slides on very
easily.

  Looks like the crank on this particular Webra is just a tinny bit larger.

  Lee, I'm sure your suggestion of heating the bushing would work, but Alan
brings up a good point about the front bearings. It may be a real chore to
get the existing bearings off, though the oven would probably do the trick
with those too.

  I wonder if this will effect the way the engine runs given that the fit on
the front bearings may be tighter?

  Keith

    ----- Original Message -----
    From: Alan Simmonds
    To: discussion at nsrca.org
    Sent: Wednesday, January 08, 2003 2:50 PM
    Subject: RE: Webra TruTurn Adapter Bushing Problem


    Just a thought... if the crank was oversize it would not fit the front
bearing.

    Alan Simmonds

     -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Lee Davis
    Sent: 08 January 2003 19:10
    To: discussion at nsrca.org
    Subject: Re: Webra TruTurn Adapter Bushing Problem


      This is a new one I haven't heard of before.  If you don't have any
luck you can always return the engine to us and we'll check it out.  Look
hard at the bushings, though.  It's difficult to imagine that out of all the
Webra engines there's one that's oversized at the crank end.  Anything's
possible though.

      One likely solution just occured to me.  Try heating the bushing in
the oven or with a small torch.  The aluminum will expand quite a bit and
I'll bet it will then slip over the crank.  It's probably not off more than
a couple of thousandths.

      Lee Davis
      Piedmont Models
      http://www.piedmontmodels.com/
        ----- Original Message -----
        From: Keith Black
        To: discussion at nsrca.org
        Sent: Wednesday, January 08, 2003 12:56 AM
        Subject: Help: Webra TruTurn Adapter Bushing Problem


        I have a new Webra 1.45 Aero X and I'm trying to mount a 3 1/4"
TruTurn FAI spinner on it. The adapter kit that is listed for this engine on
both TruTurn's and Piedmont's web page is TT-0825-A which contains an 8mm
bushing.

        The bushing fits over the threaded part of the crankshaft, but will
not fit over the unthreaded base of the crankshaft.

        I tried another 8mm bushing that I have to make sure that the
bushing with the adapter kit wasn't incorrect and neither bushing will fit.

        Using a caliper the base of the crankshaft measures about 8.1 to 8.2
mm.

        Has anyone else had this problem? Any suggested solutions?

        Thanks,
        Keith Black



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