Webra TruTurn Adapter Bushing Problem (more info)

Wed Jan 8 12:55:49 AKST 2003

Your right Keith.  Send the engine to me, and I'll give it a thorough
break-in and running this season, and report back after the nats.  vbg.
Really, I think that if the engine turns over smoothly, you won't have a
problem.  
Jim  W.

[Woodward James R Civ 416 FLTS/TPS]  -----Original Message-----
From: Keith Black [mailto:tkeithb at attbi.com]
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  <mailto:alan at gspceilings.com> Simmonds 
To: discussion at nsrca.org <mailto: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>
[mailto:discussion-request at nsrca.org] On Behalf Of Lee Davis
Sent: 08 January 2003 19:10
To: discussion at nsrca.org <mailto: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/ <http://www.piedmontmodels.com/> 

----- Original Message ----- 
From: Keith  <mailto:tkeithb at attbi.com> Black 
To: discussion at nsrca.org <mailto: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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