REFLECTOR: Gearbox alignment

[Wayne]

Marcotte finally sent me a corrected drawing and by the way admitted that 5 
other units were shipped with the 0.020 misalignment like mine had.
We relocated the holes in the bell housing  and  I flew this morning . 
Thanks Oscar. It was really pleasant to not hear the garrump garrump noise 
that has been bugging me for the last two years. I was able to cruise wide 
open for 30 minutes  with no overtemp. Of course its a cold day.
Now if I can design a better air/oil separator to keep the gearbox from 
misting  so much oil out the vent...........

Wayne

----- Original Message ----- 
From: "Alex Balic" <alex157 at direcway.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Monday, November 15, 2004 6:49 PM
Subject: RE: REFLECTOR: Gearbox alignment


> Wayne-
> You can buy a dial indicator and a magnetic base/arm from Harbor freight
> tools rather reasonably to check for run out- you might be able to re-face
> the bell housing to change angular run out, but to move the center, you
> would need to weld all of the holes closed and have new ones drilled- not
> too fun- what would you guess the misalignment is anyway?
>
> Alex
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> Behalf Of Wayne
> Sent: Monday, November 15, 2004 5:05 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Gearbox alignment
>
>
>
> ----- Original Message -----
> From: "Jim Sower" <canarder at frontiernet.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Monday, November 15, 2004 12:29 PM
> Subject: Re: REFLECTOR: Gearbox alignment
>
>
>> <... How would you measure the axial and radial run-out  of the input
>> shaft ...>
>> I would try a dial indicator.
>
> Im thinking about some kind of fixture to bolt to the crankshaft with a 
> dial
> indicator incorporated into it.
>>
>> <... in order to  relocate the mount and improve the alignment ...>
>> I would explore the possibility that the gearbox is offset from the 
>> engine
>> output shaft.  You have some sort of bell housing that mounts to the
>> engine and to which the gearbox is mounted.  If the gearbox case is 
>> wrong,
>> the input shaft of the gearbox will be offset from the output shaft of 
>> the
>> engine.  That might cause the problem(s) you have.  I can't speculate
>> further without more facts.
>
> Exactly  I believe Marcotte's bell housing  has the input shaft hole hole
> in the wrong location. The perimeter bolts and the locating pins fit well
> onto the engine.
>>
>> How big is the hole the bushing is in?  Could it be replaced by a bearing
>> race
>
> It was a bearing before and that helped to mask the misalignmet.
> ... Jim S.
>>
>> Wayne wrote:
>>
>
>
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